LT-22222-L LoRa IO Controller User Manual

The Dragino LT series I/O Modules are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as: analog current Input, analog voltage input, relay output, digital input and digital output etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.

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The LT I/O Controllers allows the user to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.

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The LT I/O Controllers is aiming to provide a simple plug and play, low cost installation by using LoRaWAN wireless technology.

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The use environment includes:

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1) If user’s area has LoRaWAN service coverage, they can just install the I/O controller and configure it to connect the LoRaWAN provider via wireless.

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2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.

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[[image:1653295757274-912.png]]

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== 1.2 Specifications ==

**Hardware System:**

* STM32L072CZT6 MCU

* SX1276/78 Wireless Chip

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* Power Consumption:

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** Idle: 4mA@12v

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** 20dB Transmit: 34mA@12v

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**Interface for Model: LT22222-L:**

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* 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)

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* 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)

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* 2 x Relay Output (5A@250VAC / 30VDC)

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* 2 x 0~~20mA Analog Input (res:0.01mA)

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* 2 x 0~~30V Analog Input (res:0.01v)

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* Power Input 7~~ 24V DC.

**LoRa Spec:**

* Frequency Range:

** Band 1 (HF): 862 ~~ 1020 Mhz

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** Band 2 (LF): 410 ~~ 528 Mhz

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* 168 dB maximum link budget.

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* +20 dBm - 100 mW constant RF output vs.

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* +14 dBm high efficiency PA.

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* Programmable bit rate up to 300 kbps.

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* High sensitivity: down to -148 dBm.

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* Bullet-proof front end: IIP3 = -12.5 dBm.

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* Excellent blocking immunity.

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* Low RX current of 10.3 mA, 200 nA register retention.

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* Fully integrated synthesizer with a resolution of 61 Hz.

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* FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.

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* Built-in bit synchronizer for clock recovery.

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* Preamble detection.

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* 127 dB Dynamic Range RSSI.

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* Automatic RF Sense and CAD with ultra-fast AFC.

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* Packet engine up to 256 bytes with CRC.

== 1.3 Features ==

* LoRaWAN Class A & Class C protocol

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* Optional Customized LoRa Protocol

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* Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865

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* AT Commands to change parameters

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* Remote configure parameters via LoRa Downlink

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* Firmware upgradable via program port

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* Counting

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== 1.4 Applications ==

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* Smart Buildings & Home Automation

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* Logistics and Supply Chain Management

* Smart Metering

* Smart Agriculture

* Smart Cities

* Smart Factory

== 1.5 Hardware Variants ==

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(% border="1" style="background-color:#f7faff; width:500px" %)

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|(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**

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|(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((

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* 2 x Digital Input (Bi-direction)

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* 2 x Digital Output

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* 2 x Relay Output (5A@250VAC / 30VDC)

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* 2 x 0~~20mA Analog Input (res:0.01mA)

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* 2 x 0~~30V Analog Input (res:0.01v)

* 1 x Counting Port

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= 2. Power ON Device =

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The LT controller can be powered by 7 ~~ 24V DC power source. Connect VIN to Power Input V+ and GND to power input V- to power the LT controller.

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PWR will on when device is properly powered.

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[[image:1653297104069-180.png]]

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= 3. Operation Mode =

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== 3.1 How it works? ==

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The LT is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the LT. It will auto join the network via OTAA. For LT-22222-L, the LED will show the Join status: After power on **TX LED** will fast blink 5 times, LT-22222-L will enter working mode and start to JOIN LoRaWAN network. **TX LED** will be on for 5 seconds after joined in network. When there is message from server, the **RX LED** will be on for 1 second.

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In case user can’t set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>path:#AT_Command]] to set the keys in the devices.

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3.2 Example to join LoRaWAN network

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This chapter shows an example for how to join the TTN LoRaWAN Network. Below is the network structure, we use our LG308 as LoRaWAN gateway here.

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[[image:image-20220523172350-1.png||height="266" width="864"]]

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The LG308 is already set to connect to [[TTN network >>url:https://www.thethingsnetwork.org/]]. So what we need to do now is only configure register this device to TTN:

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**Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.

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Each LT is shipped with a sticker with the default device EUI as below:

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[[image:1653297924498-393.png]]

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Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:

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Add APP EUI in the application.

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[[image:1653297955910-247.png||height="321" width="716"]]

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Add APP KEY and DEV EUI

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[[image:1653298023685-319.png]]

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**Step 2**: Power on LT and it will auto join to the TTN network. After join success, it will start to upload message to TTN and user can see in the panel.

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[[image:1653298044601-602.png||height="405" width="709"]]

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== 3.3 Uplink Payload ==

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There are five working modes + one interrupt mode on LT for different type application:

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* **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO

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* **MOD2**: Double DI Counting + DO + RO

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* **MOD3**: Single DI Counting + 2 x ACI + DO + RO

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* **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO

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* **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO

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* **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5

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=== 3.3.1 AT+MOD~=1, 2ACI+2AVI ===

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The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.

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[[image:image-20220523174024-3.png]]

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(% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below

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[[image:image-20220523174254-4.png]]

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* RO is for relay. ROx=1 : close，ROx=0 always open.

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* DI is for digital input. DIx=1: high or float, DIx=0: low.

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* DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.

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(% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L

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For example if payload is: [[image:image-20220523175847-2.png]]

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**The value for the interface is: **

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AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V

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AVI2 channel voltage is 0x04AC/1000=1.196V

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ACI1 channel current is 0x1310/1000=4.880mA

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ACI2 channel current is 0x1300/1000=4.864mA

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The last byte 0xAA= 10101010(B) means

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* [1] RO1 relay channel is close and the RO1 LED is ON.

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* [0] RO2 relay channel is open and RO2 LED is OFF;

**LT22222-L:**

* [1] DI2 channel is high input and DI2 LED is ON;

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* [0] DI1 channel is low input;

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* [0] DO3 channel output state

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** DO3 is float in case no load between DO3 and V+.;

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** DO3 is high in case there is load between DO3 and V+.

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** DO3 LED is off in both case

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* [1] DO2 channel output is low and DO2 LED is ON.

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* [0] DO1 channel output state

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** DO1 is float in case no load between DO1 and V+.;

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** DO1 is high in case there is load between DO1 and V+.

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** DO1 LED is off in both case

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=== 3.3.2 AT+MOD~=2, (Double DI Counting) ===

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**For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.

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Total : 11 bytes payload

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[[image:image-20220523180452-3.png]]

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(% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below

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[[image:image-20220523180506-4.png]]

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* RO is for relay. ROx=1 : close，ROx=0 always open.

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* FIRST: Indicate this is the first packet after join network.

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* DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.

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(% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.

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**To use counting mode, please run:**

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(% class="box infomessage" %)

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**AT+MOD=2**

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(% class="box infomessage" %)

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**ATZ**

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(% style="color:#4f81bd" %)**AT Commands for counting:**

**For LT22222-L:**

(% class="box infomessage" %)

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**AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **

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(% class="box infomessage" %)

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**AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **

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(% class="box infomessage" %)

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**AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **

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(% class="box infomessage" %)

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**AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **

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(% class="box infomessage" %)

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**AT+SETCNT=1,60 (Set COUNT1 value to 60)**

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(% class="box infomessage" %)

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**AT+SETCNT=2,60 (Set COUNT2 value to 60)**

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=== 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===

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**LT22222-L**: This mode the DI1 is used as a counting pin.

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[[image:image-20220523181246-5.png]]

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(% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below

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[[image:image-20220523181301-6.png]]

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* RO is for relay. ROx=1 : close，ROx=0 always open.

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* FIRST: Indicate this is the first packet after join network.

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* DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.

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(% style="color:red" %)Note: DO3 is not valid for LT-22222-L.

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**To use counting mode, please run:**

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(% class="box infomessage" %)

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**AT+MOD=3**

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**ATZ**

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Other AT Commands for counting are similar to [[MOD2 Counting Command>>path:#COUNT_COMMAND]].

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=== 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===

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**LT22222-L**: This mode the DI1 is used as a counting pin.

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The AVI1 is also used for counting. AVI1 is used to monitor the voltage. It will check the voltage **every 60s**, if voltage is higher or lower than VOLMAX mV, the AVI1 Counting increase 1, so AVI1 counting can be used to measure a machine working hour.

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[[image:image-20220523181903-8.png]]

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(% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below

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[[image:image-20220523181727-7.png]]

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* RO is for relay. ROx=1 : close，ROx=0 always open.

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* FIRST: Indicate this is the first packet after join network.

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* DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.

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(% style="color:red" %)Note: DO3 is not valid for LT-22222-L.

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**To use this mode, please run:**

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(% class="box infomessage" %)

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**AT+MOD=4**

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(% class="box infomessage" %)

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**ATZ**

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Other AT Commands for counting are similar to [[MOD2 Counting Command>>path:#COUNT_COMMAND]].

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**Plus below command for AVI1 Counting:**

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(% class="box infomessage" %)

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**AT+SETCNT=3,60 (set AVI Count to 60)**

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(% class="box infomessage" %)

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**AT+VOLMAX=20000 (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**

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(% class="box infomessage" %)

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**AT+VOLMAX=20000,0 (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**

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(% class="box infomessage" %)

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**AT+VOLMAX=20000,1 (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**

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=== 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===

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**LT22222-L**: This mode the DI1 is used as a counting pin.

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[[image:image-20220523182334-9.png]]

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(% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below

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* RO is for relay. ROx=1 : close，ROx=0 always open.

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* FIRST: Indicate this is the first packet after join network.

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* DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.

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(% style="color:red" %)Note: DO3 is not valid for LT-22222-L.

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**To use this mode, please run:**

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(% class="box infomessage" %)

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**AT+MOD=5**

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(% class="box infomessage" %)

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**ATZ**

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Other AT Commands for counting are similar to [[MOD2 Counting Command>>path:#COUNT_COMMAND]].

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=== 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===

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(% style="color:#4F81BD" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**

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For example, if user has configured below commands:

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* AT+MOD=1 --> The normal working mode

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* AT+ADDMOD6=1 --> Enable trigger

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LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:

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1. Periodically uplink (Base on TDC time). Payload is same as the normal MOD (MOD 1 for above command). This uplink uses LoRaWAN **unconfirmed** data type

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1. Trigger uplink when meet the trigger condition. LT will sent two packets in this case, the first uplink use payload specify in this mod (mod=6), the second packets use the normal mod payload(MOD=1 for above settings). Both Uplinks use LoRaWAN **CONFIRMED data type.**

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**AT Command to set Trigger Condition**:

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**Trigger base on voltage**:

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Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>

Example:

AT+AVLIM=3000,6000,0,2000 (If AVI1 voltage lower than 3v or higher than 6v. or AV2 voltage is higher than 2v, LT will trigger Uplink)

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AT+AVLIM=5000,0,0,0 (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)

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**Trigger base on current**:

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Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>

Example:

AT+ACLIM=10000,15000,0,0 (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)

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**Trigger base on DI status**:

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DI status trigger Flag.

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Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >

Example:

AT+ DTRI =1,0 (Enable DI1 trigger / disable DI2 trigger)

**Downlink Command to set Trigger Condition**

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Type Code: 0xAA. Downlink command same as AT Command [[AT+AVLIM, AT+ACLIM>>path:#AT_Trigger]]

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Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4

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AA: Code for this downlink Command:

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xx: 0: Limit for AV1 and AV2; 1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable

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yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.

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yy2 yy2: AC1 or AV1 high limit.

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yy3 yy3: AC2 or AV2 low limit.

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Yy4 yy4: AC2 or AV2 high limit.

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Example1: AA 00 13 88 00 00 00 00 00 00

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Same as AT+AVLIM=5000,0,0,0 (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)

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Example2: AA 02 01 00

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Same as AT+ DTRI =1,0 (Enable DI1 trigger / disable DI2 trigger)

**Trigger Settings Payload Explanation:**

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MOD6 Payload : total 11 bytes payload

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(% border="1" style="background-color:#f7faff" %)

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|Size(bytes)|1|1|1|6|1|1

|Value|(((

TRI_A

FLAG

)))|(((

TRI_A

Status

)))|(((

TRI_DI

FLAG+STA

)))|Reserve|Enable/Disable MOD6|(((

MOD

(6)

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**TRI FLAG1** is a combination to show if trigger is set for this part. Totally 1byte as below

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(% border="1" style="background-color:#f7faff" %)

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|bit7|bit6|bit5|bit4|bit3|bit2|bit1|bit0

|(((

AV1_

LOW

)))|(((

AV1_

HIGH

)))|(((

AV2_

LOW

)))|(((

AV2_

HIGH

)))|(((

AC1_

LOW

)))|(((

AC1_

HIGH

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AC2_

LOW

)))|(((

AC2_

HIGH

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* Each bits shows if the corresponding trigger has been configured.

Example:

10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW

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**TRI Status1** is a combination to show which condition is trigger. Totally 1byte as below

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(% border="1" style="background-color:#f7faff" %)

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|bit7|bit6|bit5|bit4|bit3|bit2|bit1|bit0

|(((

AV1_

LOW

)))|(((

AV1_

HIGH

)))|(((

AV2_

LOW

)))|(((

AV2_

HIGH

)))|(((

AC1_

LOW

)))|(((

AC1_

HIGH

)))|(((

AC2_

LOW

)))|(((

AC2_

HIGH

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* Each bits shows which status has been trigger on this uplink.

Example:

10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.

**TRI_DI FLAG+STA **is a combination to show which condition is trigger. Totally 1byte as below

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(% border="1" style="background-color:#f7faff" %)

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|bit7|bit6|bit5|bit4|bit3|bit2|bit1|bit0

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|N/A|N/A|N/A|N/A|DI2_STATUS|DI2_FLAG|DI1_STATUS|DI1_FLAG

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* Each bits shows which status has been trigger on this uplink.

Example:

00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.

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00000101: Means both DI1 and DI2 trigger are enabled.

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**Enable/Disable MOD6 **: 0x01: MOD6 is enable. 0x00: MOD6 is disable.

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Downlink command to poll MOD6 status:

AB 06

When device got this command, it will send the MOD6 payload.

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11.

111. Payload Decoder

**Decoder for TTN/loraserver/ChirpStack**: [[http:~~/~~/www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/Payload_decoder/>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/Payload_decoder/]]

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11. Configure LT via AT or Downlink

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User can configure LT I/O Controller via [[AT Commands >>path:#_Using_the_AT]]or LoRaWAN Downlink Commands

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There are two kinds of Commands:

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* **Common Commands**: They should be available for each sensor, such as: change uplink interval, reset device. For firmware v1.5.4, user can find what common commands it supports: http:~/~/wiki.dragino.com/index.php?title=End_Device_AT_Commands_and_Downlink_Commands

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* **Sensor Related Commands**: These commands are special designed for LT-22222-L. User can see these commands below:

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11.

111. Common Commands:

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They should be available for each of Dragino Sensors, such as: change uplink interval, reset device. For firmware v1.5.4, user can find what common commands it supports: http:~/~/wiki.dragino.com/index.php?title=End_Device_AT_Commands_and_Downlink_Commands

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111. Sensor related commands:

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==== Set Transmit Interval ====

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Set device uplink interval.

* AT Command:

AT+TDC=N

Example: AT+TDC=30000. Means set interval to 30 seconds

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* Downlink Payload (prefix 0x01):

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0x01 aa bb cc ~/~/ Same as AT+TDC=0x(aa bb cc)

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==== Set Work Mode (AT+MOD) ====

Set work mode.

* AT Command:

AT+MOD=N

Example: AT+MOD=2. Set work mode to Double DI counting mode

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* Downlink Payload (prefix 0x0A):

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0x0A aa ~/~/ Same as AT+MOD=aa

==== Poll an uplink ====

* AT Command:

There is no AT Command to poll uplink

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* Downlink Payload (prefix 0x08):

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0x08 FF ~/~/ Poll an uplink,

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Example: 0x08FF, ask device to send an Uplink

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==== Enable Trigger Mode ====

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Use of trigger mode, please check [[ADDMOD6>>path:#MOD6]]

* AT Command:

AT+ADDMOD6=1 or 0

1: Enable Trigger Mode

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0: Disable Trigger Mode

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* Downlink Payload (prefix 0x0A 06):

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0x0A 06 aa ~/~/ Same as AT+ADDMOD6=aa,

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==== Poll trigger settings ====

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Poll trigger settings,

* AT Command:

There is no AT Command for this feature.

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* Downlink Payload (prefix 0x AB 06):

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0xAB 06 ~/~/ Poll trigger settings, device will uplink [[trigger settings>>path:#Trigger_Settings]] once receive this command

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==== Enable / Disable DI1/DI2/DI3 as trigger ====

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Enable Disable DI1/DI2/DI2 as trigger,

* AT Command:

Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >

Example:

AT+ DTRI =1,0 (Enable DI1 trigger / disable DI2 trigger)

* Downlink Payload (prefix 0xAA 02):

769

770

0xAA 02 aa bb ~/~/ Same as AT+DTRI=aa,bb

==== Trigger1 – Set DI1 or DI3 as trigger ====

775

776

Set DI1 or DI3(for LT-33222-L) trigger.

* AT Command:

AT+TRIG1=a,b

a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).

b : delay timing.

Example:

AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )

789

790

791

* Downlink Payload (prefix 0x09 01 ):

792

793

0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)

794

795

796

==== Trigger2 – Set DI2 as trigger ====

Set DI2 trigger.

* AT Command:

AT+TRIG2=a,b

a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).

b : delay timing.

Example:

AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )

811

812

813

* Downlink Payload (prefix 0x09 02 ):

814

815

0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)

816

817

818

==== Trigger – Set AC (current) as trigger ====

819

820

Set current trigger , base on AC port. See [[trigger mode>>path:#MOD6]]

* AT Command:

AT+ACLIM. See [[trigger mode>>path:#MOD6]]

825

826

827

* Downlink Payload (prefix 0xAA 01 ):

828

829

0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>path:#MOD6]]

830

831

832

==== Trigger – Set AV (voltage) as trigger ====

833

834

Set current trigger , base on AV port. See [[trigger mode>>path:#MOD6]]

* AT Command:

AT+AVLIM. See [[trigger mode>>path:#MOD6]]

839

840

841

* Downlink Payload (prefix 0xAA 00 ):

842

843

0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>path:#MOD6]]

844

845

==== Trigger – Set minimum interval ====

846

847

Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.

* AT Command:

AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.

852

853

854

* Downlink Payload (prefix 0xAC ):

855

856

0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb) . Unit (min)

857

858

859

==== DO ~-~- Control Digital Output DO1/DO2/DO3 ====

* AT Command:

There is no AT Command to control Digital Output

864

865

866

* Downlink Payload (prefix 0x02):

867

868

0x02 aa bb cc ~/~/ Set DO1/DO2/DO3 output

869

870

If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.

871

872

01: Low, 00: High , 11: No action

873

874

(% border="1" style="background-color:#f7faff" %)

875

|Downlink Code|DO1|DO2|DO3

876

|02 01 00 11|Low|High|No Action

877

|02 00 11 01|High|No Action|Low

878

|02 11 01 00|No Action|Low|High

879

880

Note: For LT-22222-L, there is no DO3, the last byte can use any value.

881

882

Device will upload a packet if downlink code executes successfully.

==== DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====

* AT Command:

There is no AT Command to control Digital Output

893

894

895

* Downlink Payload (prefix 0xA9):

896

897

0xA9 aa bb cc ~/~/ Set DO1/DO2/DO3 output with time control

898

899

This is to control the digital output time of DO pin. Include four bytes:

900

901

**First Byte:** Type code (0xA9)

902

903

**Second Byte**: Inverter Mode

904

905

01: DO pins will change back to original state after timeout.

906

907

00: DO pins will change to an inverter state after timeout

908

909

910

**Third Byte**: Control Method and Ports status:

911

912

(% border="1" style="background-color:#f7faff" %)

913

|Second Byte|Status

914

|0x01|DO1 set to low

915

|0x00|DO1 set to high

916

|0x11|DO1 NO Action

917

918

**Fourth Byte**: Control Method and Ports status:

919

920

(% border="1" style="background-color:#f7faff" %)

921

|Second Byte|Status

922

|0x01|DO2 set to low

923

|0x00|DO2 set to high

924

|0x11|DO2 NO Action

925

926

**Fifth Byte**: Control Method and Ports status:

927

928

(% border="1" style="background-color:#f7faff" %)

929

|Second Byte|Status

930

|0x01|DO3 set to low

931

|0x00|DO3 set to high

932

|0x11|DO3 NO Action

933

934

**Sixth and Seventh Byte**:

935

936

Latching time. Unit: ms

937

938

Device will upload a packet if downlink code executes successfully.

Example payload:

1. A9 01 01 01 01 07 D0

945

946

DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.

947

948

949

1. A9 01 00 01 11 07 D0

950

951

DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.

952

953

954

1. A9 00 00 00 00 07 D0

955

956

DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.

957

958

959

1. A9 00 11 01 00 07 D0

960

961

DO1 pin no action, DO2 pin set low, DO3 pin set high, last 2 seconds, then DO1 pin no action, DO2 pin set high, DO3 pin set low

==== Relay ~-~- Control Relay Output RO1/RO2 ====

* AT Command:

There is no AT Command to control Relay Output

971

972

973

* Downlink Payload (prefix 0x03):

974

975

0x03 aa bb ~/~/ Set RO1/RO2 output

976

977

If payload = 0x030100, it means set RO1 to close and RO2 to open.

978

979

01: Close , 00: Open , 11: No action

980

981

(% border="1" style="background-color:#f7faff" %)

982

|Downlink Code|RO1|RO2

983

|03 00 11|Open|No Action

984

|03 01 11|Close|No Action

985

|03 11 00|No Action|Open

986

|03 11 01|No Action|Close

987

|03 00 00|Open|Open

988

|03 01 01|Close|Close

|03 01 00|Close|Open

|03 00 01|Open|Close

Device will upload a packet if downlink code executes successfully.

993

994

995

==== Relay ~-~- Control Relay Output RO1/RO2 with time control ====

* AT Command:

There is no AT Command to control Relay Output

1000

1001

1002

* Downlink Payload (prefix 0x05):

1003

1004

0x05 aa bb cc dd ~/~/ Set RO1/RO2 relay with time control:

1005

1006

This is to control the relay output time of relay. Include four bytes:

1007

1008

**First Byte:** Type code (0x05)

1009

1010

**Second Byte(aa)**: Inverter Mode

1011

1012

01: Relays will change back to original state after timeout.

1013

1014

00: Relays will change to an inverter state after timeout

1015

1016

1017

**Third Byte(bb)**: Control Method and Ports status:

1018

1019

(% border="1" style="background-color:#f7faff" %)

1020

|Value|Status

1021

|0x11|RO1 and RO2 to NO

1022

|0x10|RO2 to NO, RO1 to NC

1023

|0x01|RO2 to NC, RO1 to NO

1024

|0x00|RO1 and RO2 to NC.

1025

|0x20|RO1 No Action, RO2 to NC

1026

|0x21|RO1 No Action, RO2 to NO

1027

|0x02|RO1 to NC, RO2 No Action

1028

|0x12|RO1 to NO, RO2 No Action

1029

1030

**Fourth / Fifth Bytes (cc)**: Latching time. Unit: ms

1031

1032

Device will upload a packet if downlink code executes successfully.

**Example payload:**

1. 05 01 11 07 D0

Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.

1. 05 01 10 07 D0

Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.

1. 05 00 01 07 D0

Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.

1. 05 00 00 07 D0

Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.

==== Counting ~-~- Voltage threshold counting ====

1063

1064

When voltage exceed the threshold, count. Feature see [[MOD4>>path:#MOD4]]

* AT Command:

AT+VOLMAX ~/~/ See [[MOD4>>path:#MOD4]]

1069

1070

1071

* Downlink Payload (prefix 0xA5):

1072

1073

0xA5 aa bb cc ~/~/ Same as AT+VOLMAX=(aa bb),cc

1074

1075

1076

==== Counting ~-~- Pre-configure the Count Number ====

* AT Command:

AT+SETCNT=aa,(bb cc dd ee)

aa: 1: Set count1,

2: Set count2,

3: Set AV1 count

Bb cc dd ee: number to be set

1089

1090

1091

* Downlink Payload (prefix 0xA8):

1092

1093

0x A8 aa bb cc dd ee ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)

==== Counting ~-~- Clear Counting ====

1100

1101

Clear counting for counting mode

* AT Command:

AT+CLRCOUNT ~/~/ clear all counting

1106

1107

1108

* Downlink Payload (prefix 0xA6):

1109

1110

0x A6 01 ~/~/ clear all counting,

==== Counting ~-~- Change counting mode save time ====

* AT Command:

AT+COUTIME=60 ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)

1120

1121

1122

* Downlink Payload (prefix 0xA7):

1123

1124

0x A7 aa bb cc ~/~/ same as AT+COUTIME =aa bb cc,

1125

1126

range: aa bb cc:0 to 16777215, (unit:second)

1.

11. Integrate with Mydevice

1133

1134

Mydevices provides a human friendly interface to show the sensor data, once we have data in TTN, we can use Mydevices to connect to TTN and see the data in Mydevices. Below are the steps:

1135

1136

1137

Step 1: Be sure that your device is programmed and properly connected to the network at this time.

1138

1139

Step 2: To configure the Application to forward data to Mydevices you will need to add integration. To add the Mydevices integration, perform the following steps:

1140

1141

1142

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image010.png]]

1143

1144

1145

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image011.png]]

1146

1147

1148

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image012.png]]

Step 3: Create an account or log in Mydevices.

1153

1154

Step 4: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.

1155

1156

Search under The things network

1157

1158

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image013.png]]

1159

1160

1161

After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.

1162

1163

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image014.png]]

1164

1165

1166

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image015.png]]

1167

1168

1169

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image016.png]]

1170

1171

1172

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image017.png]]

1173

1174

1175

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image018.png]]

1.

11. Interface Detail

111. Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active )

1181

1182

Support NPN Type sensor

1183

1184

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image019.png]]

1.

11.

111. Digital Input Port: DI1/DI2 ( For LT-22222-L)

1191

1192

The DI port of LT-22222-L can support NPN or PNP output sensor.

1193

1194

Internal circuit as below, the NEC2501 is a photocoupler, the Active current (from NEC2501 pin 1 to pin 2 is 1ma and the max current is 50mA. When there is active current pass NEC2501 pin1 to pin2. The DI will be active high

1195

1196

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image020.png]]

1197

1198

When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.

1199

1200

1201

**Example1**: Connect to a Low active sensor.

1202

1203

This type of sensor will output a low signal GND when active.

1204

1205

* Connect sensor’s output to DI1-

1206

* Connect sensor’s VCC to DI1+.

1207

1208

So when sensor active, the current between NEC2501 pin1 and pin2 is:

1209

1210

//IF//[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image021.png]] = DI1+ / 1K.

1211

1212

If DI1+ = 12v, the //IF//[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image022.png]] = 12mA , So the LT-22222-L will be able to detect this active signal.

1213

1214

1215

**Example2**: Connect to a High active sensor.

1216

1217

This type of sensor will output a high signal (example 24v) when active.

1218

1219

* Connect sensor’s output to DI1+

1220

* Connect sensor’s GND DI1-.

1221

1222

So when sensor active, the current between NEC2501 pin1 and pin2 is:

1223

1224

//IF//[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image021.png]] = DI1+ / 1K.

1225

1226

If DI1+ = 24v, the //IF//[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image022.png]] = 24mA , So the LT-22222-L will be able to detect this high active signal.

1227

1228

1229

**Example3**: Connect to a 220v high active sensor.公司测试一下

1230

1231

Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler

1232

1233

* Connect sensor’s output to DI1+ with a serial 50K resistor

1234

* Connect sensor’s GND DI1-.

1235

1236

So when sensor active, the current between NEC2501 pin1 and pin2 is:

1237

1238

//IF//[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image021.png]] = DI1+ / 51K.

1239

1240

If sensor output is 220v, the //IF//[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image022.png]] = 4.3mA , So the LT-22222-L will be able to detect this high active signal safely.

1.

11.

111. Digital Output Port: DO1/DO2 /DO3

1246

1247

NPN output: GND or Float. Max voltage can apply to output pin is 36v.

1248

1249

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image023.png]]

1.

11.

111. Analog Input Interface

1257

1258

The analog input interface is as below. The LT will measure the IN2 voltage so to calculate the current pass the Load. The formula is:

1259

1260

AC2 = (IN2 voltage )/12

1261

1262

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image024.png]]

Example to connect a 4~~20mA sensor

1267

1268

We take the wind speed sensor as an example for reference only.

1269

1270

Specifications of the wind speed sensor:

Red:12~~24v

Yellow:4~~20mA

Black:GND

Connection diagram:

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image025.jpg]]

1282

1283

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image026.png]]

1.

11.

111. Relay Output

The LT serial controller has two relay interfaces; each interface uses two pins of the screw terminal. User can connect other device’s Power Line to in serial of RO1_1 and RO_2. Such as below:

1292

1293

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image027.png]]

1294

1295

1296

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image028.png]]

1.

11. LEDs Indicators

(% border="1" style="background-color:#f7faff" %)

1306

|**LEDs**|**Feature**

1307

|**PWR**|Always on if there is power

1308

|**SYS**|After device is powered on, the SYS will **fast blink in GREEN** for 5 times, means RS485-LN start to join LoRaWAN network. If join success, SYS will be **on GREEN for 5 seconds. **SYS will **blink Blue** on every upload and **blink Green** once receive a downlink message.

1309

|**TX**|(((

1310

Device boot: TX blinks 5 times.

1311

1312

Successful join network: TX ON for 5 seconds.

1313

1314

Transmit a LoRa packet: TX blinks once

1315

)))

1316

|**RX**|RX blinks once when receive a packet.

|**DO1**|

|**DO2**|

|**DO3**|

|**DI2**|(((

For LT-22222-L: ON when DI2 is high, LOW when DI2 is low

1322

1323

For LT-33222-L: ON when DI2 is low, LOW when DI2 is high

1324

)))

1325

|**DI2**|(((

1326

For LT-22222-L: ON when DI2 is high, LOW when DI2 is low

1327

1328

For LT-33222-L: ON when DI2 is low, LOW when DI2 is high

1329

)))

1330

|**DI3**|For LT-33222-L ONLY: ON when DI3 is low, LOW when DI3 is high

1331

|**DI2**|(((

1332

For LT-22222-L: ON when DI2 is high, LOW when DI2 is low

1333

1334

For LT-33222-L: ON when DI2 is low, LOW when DI2 is high

)))

|**RO1**|

|**RO2**|

1. Use AT Command

11. Access AT Command

1341

1342

LT supports AT Command set. User can use a USB to TTL adapter plus the 3.5mm Program Cable to connect to LT for using AT command, as below.

1343

1344

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image029.png]]

1345

1346

1347

In PC, User needs to set **serial tool**(such as [[putty>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) baud rate to **9600** to access to access serial console for LT. The AT commands are disable by default and need to enter password (default:**123456**) to active it. As shown below:

1348

1349

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image030.png]]

1350

1351

1352

More detail AT Command manual can be found at [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]

1353

1354

AT+<CMD>? : Help on <CMD>

AT+<CMD> : Run <CMD>

AT+<CMD>=<value> : Set the value

1359

1360

AT+<CMD>=? : Get the value

1361

1362

ATZ: Trig a reset of the MCU

1363

1364

AT+FDR: Reset Parameters to Factory Default, Keys Reserve

1365

1366

AT+DEUI: Get or Set the Device EUI

1367

1368

AT+DADDR: Get or Set the Device Address

1369

1370

AT+APPKEY: Get or Set the Application Key

1371

1372

AT+NWKSKEY: Get or Set the Network Session Key

1373

1374

AT+APPSKEY: Get or Set the Application Session Key

1375

1376

AT+APPEUI: Get or Set the Application EUI

1377

1378

AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)

1379

1380

AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)

1381

1382

AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)

1383

1384

AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing

1385

1386

AT+PNM: Get or Set the public network mode. (0: off, 1: on)

1387

1388

AT+RX2FQ: Get or Set the Rx2 window frequency

1389

1390

AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)

1391

1392

AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms

1393

1394

AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms

1395

1396

AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms

1397

1398

AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms

1399

1400

AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)

1401

1402

AT+NWKID: Get or Set the Network ID

1403

1404

AT+FCU: Get or Set the Frame Counter Uplink

1405

1406

AT+FCD: Get or Set the Frame Counter Downlink

1407

1408

AT+CLASS: Get or Set the Device Class

1409

1410

AT+JOIN: Join network

1411

1412

AT+NJS: Get OTAA Join Status

1413

1414

AT+SENDB: Send hexadecimal data along with the application port

1415

1416

AT+SEND: Send text data along with the application port

1417

1418

AT+RECVB: Print last received data in binary format (with hexadecimal values)

1419

1420

AT+RECV: Print last received data in raw format

1421

1422

AT+VER: Get current image version and Frequency Band

1423

1424

AT+CFM: Get or Set the confirmation mode (0-1)

1425

1426

AT+CFS: Get confirmation status of the last AT+SEND (0-1)

1427

1428

AT+SNR: Get the SNR of the last received packet

1429

1430

AT+RSSI: Get the RSSI of the last received packet

1431

1432

AT+TDC: Get or set the application data transmission interval in ms

1433

1434

AT+PORT: Get or set the application port

1435

1436

AT+DISAT: Disable AT commands

1437

1438

AT+PWORD: Set password, max 9 digits

1439

1440

AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode

1441

1442

AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470

1443

1444

AT+CFG: Print all settings

1.

11. Common AT Command Sequence

1450

111. Multi-channel ABP mode (Use with SX1301/LG308)

1451

1452

If device has not joined network yet:

123456

AT+FDR

123456

AT+NJM=0

ATZ

If device already joined network:

AT+NJM=0

ATZ

1.

11.

111. Single-channel ABP mode (Use with LG01/LG02)

1474

1475

123456 Enter Password to have AT access.

1476

1477

AT+FDR Reset Parameters to Factory Default, Keys Reserve

1478

1479

123456 Enter Password to have AT access.

1480

1481

AT+CLASS=C Set to work in CLASS C

1482

1483

AT+NJM=0 Set to ABP mode

1484

1485

AT+ADR=0 Set the Adaptive Data Rate Off

1486

1487

AT+DR=5 Set Data Rate

1488

1489

AT+TDC=60000 Set transmit interval to 60 seconds

1490

1491

AT+CHS=868400000 Set transmit frequency to 868.4Mhz

1492

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AT+RX2FQ=868400000 Set RX2Frequency to 868.4Mhz (according to the result from server)

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AT+RX2DR=5 Set RX2DR to match the downlink DR from server. see below

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AT+DADDR=26 01 1A F1 Set Device Address to 26 01 1A F1, this ID can be found in the LoRa Server portal.

ATZ Reset MCU

**Note:**

1. Make sure the device is set to ABP mode in the IoT Server.

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1. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.

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1. Make sure SF / bandwidth setting in LG01/LG02 match the settings of AT+DR. refer [[this link>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/&file=LoRaWAN%201.0.3%20Regional%20Parameters.xlsx]] to see what DR means.

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1. The command AT+RX2FQ and AT+RX2DR is to let downlink work. to set the correct parameters, user can check the actually downlink parameters to be used. As below. Which shows the RX2FQ should use 868400000 and RX2DR should be 5

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[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image031.png]]

1.

11.

111. Change to Class A

If sensor JOINED

AT+CLASS=A

ATZ

1. FAQ

1.

11. How to upgrade the image?

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The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:

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* Support new features

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* For bug fix

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* Change LoRaWAN bands.

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Below shows the hardware connection for how to upload an image to the LT:

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[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image029.png]]

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**Step1:** Download [[flash loader>>url:https://www.st.com/content/st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools/stm32-programmers/flasher-stm32.html]].

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**Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].

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**Step3: **Open flashloader; choose the correct COM port to update.

**For LT-33222-L**:

Hold down the PRO button and then momentarily press the RST reset button and the **DO2 led** will change from OFF to ON. When **DO2 LED** is on, it means the device is in download mode.

**For LT-22222-L**:

Hold down the PRO button and then momentarily press the RST reset button and the **DO1 led** will change from OFF to ON. When **DO1 LED** is on, it means the device is in download mode.

|(((

Board detected

)))

|(((

)))

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image032.png]] [[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image033.png]]

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image034.png]] [[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image035.png]]

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[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image036.png]] [[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image037.png]]

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**Notice**: In case user has lost the program cable. User can hand made one from a 3.5mm cable. The pin mapping is:

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[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image038.png]]

1.

11. How to change the LoRa Frequency Bands/Region?

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User can follow the introduction for [[how to upgrade image>>path:#upgrade_image]]. When download the images, choose the required image file for download.

1.

11. How to set up LT to work with Single Channel Gateway such as LG01/LG02?

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In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.

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Assume we have a LG02 working in the frequency 868400000 now , below is the step.

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**Step1**: Log in TTN, Create an ABP device in the application and input the network session key (NETSKEY), app session key (APPSKEY) from the device.

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[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image039.png]]

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Note: user just need to make sure above three keys match, User can change either in TTN or Device to make then match. In TTN, NETSKEY and APPSKEY can be configured by user in setting page, but Device Addr is generated by TTN.

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**Step2: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:

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123456 Enter Password to have AT access.

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AT+FDR Reset Parameters to Factory Default, Keys Reserve

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123456 Enter Password to have AT access.

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AT+NJM=0 Set to ABP mode

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AT+ADR=0 Set the Adaptive Data Rate Off

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AT+DR=5 Set Data Rate (Set AT+DR=3 for 915 band)

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AT+TDC=60000 Set transmit interval to 60 seconds

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AT+CHS=868400000 Set transmit frequency to 868.4Mhz

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AT+DADDR=26 01 1A F1 Set Device Address to 26 01 1A F1

ATZ Reset MCU

As shown in below:

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image040.png]]

1.

11. Can I see counting event in Serial?

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User can run AT+DEBUG command to see the counting event in serial. If firmware too old and doesn’t support AT+DEBUG. User can update to latest firmware first.

1. Trouble Shooting

11. Downlink doesn’t work, how to solve it?

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Please see this link for how to debug:

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[[http:~~/~~/wiki.dragino.com/index.php?title=LoRaWAN_Communication_Debug#How_it_work>>url:http://wiki.dragino.com/index.php?title=LoRaWAN_Communication_Debug#How_it_work]]

1.

11. Have trouble to upload image.

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See this link for trouble shooting:

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[[http:~~/~~/wiki.dragino.com/index.php?title=Firmware_Upgrade_Trouble_Shooting#UART_upgrade_trouble_shooting>>url:http://wiki.dragino.com/index.php?title=Firmware_Upgrade_Trouble_Shooting#UART_upgrade_trouble_shooting]]

1.

11. Why I can’t join TTN in US915 /AU915 bands?

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It might be about the channels mapping. Please see this link for detail:

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[[http:~~/~~/wiki.dragino.com/index.php?title=LoRaWAN_Communication_Debug#Notice_of_US915.2FCN470.2FAU915_Frequency_band>>url:http://wiki.dragino.com/index.php?title=LoRaWAN_Communication_Debug#Notice_of_US915.2FCN470.2FAU915_Frequency_band]]

1. Order Info

**For LT-33222-L-XXX or LT-22222-L-XXX:**

**XXX:**

* **EU433**: LT with frequency bands EU433

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* **EU868**: LT with frequency bands EU868

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* **KR920**: LT with frequency bands KR920

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* **CN470**: LT with frequency bands CN470

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* **AS923**: LT with frequency bands AS923

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* **AU915**: LT with frequency bands AU915

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* **US915**: LT with frequency bands US915

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* **IN865**: LT with frequency bands IN865

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* **CN779**: LT with frequency bands CN779

1. Packing Info

**Package Includes**:

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* LT I/O Controller x 1

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* Stick Antenna for LoRa RF part x 1

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* Bracket for controller x1

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* Program cable x 1

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**Dimension and weight**:

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* Device Size: 13.5 x 7 x 3 cm

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* Device Weight: 105g

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* Package Size / pcs : 14.5 x 8 x 5 cm

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* Weight / pcs : 170g

1. Support

* Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different timezones we cannot offer live support. However, your questions will be answered as soon as possible in the before-mentioned schedule.

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* Provide as much information as possible regarding your enquiry (product models, accurately describe your problem and steps to replicate it etc) and send a mail to

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[[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]

Wiki source code of LT-22222-L LoRa IO Controller User Manual