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:540px" %)

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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.

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:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image004.png]]

1. Operation Mode

11. How it works?

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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11. 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:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image005.png]]

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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:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image006.png]]

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:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image007.png]]

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Add APP KEY and DEV EUI

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[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image008.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:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image009.png]]

1.

11. Uplink Payload

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

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* [[MOD1>>path:#MOD1]]: (default setting): 2 x ACI + 2AVI + DI + DO + RO

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* [[MOD2>>path:#MOD2]]: Double DI Counting + DO + RO

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* [[MOD3>>path:#MOD3]]: Single DI Counting + 2 x ACI + DO + RO

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* [[MOD4>>path:#MOD4]]: Single DI Counting + 1 x Voltage Counting + DO + RO

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* [[MOD5>>path:#MOD5]]: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO

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* [[ADDMOD6>>path:#MOD6]]: Trigger Mode, Optional, used together with MOD1 ~~ MOD5

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11.

111. 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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|Size(bytes)|2|2|2|2|1|1|1

|Value|(((

AVI1

voltage

)))|(((

AVI2

voltage

)))|(((

ACI1

Current

)))|(((

ACI2

Current

)))|DIDORO*|(((

Reserve

)))|MOD

**DIDORO** is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below

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

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|RO1|RO2|DI3|DI2|DI1|DO3|DO2|DO1

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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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Note: DI3 and DO3 bit are not valid for LT-22222-L

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For example if payload is: 04 AB 04 AC 13 10 13 00 AA FF 01

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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;

LT33222-L:

* [1] DI3 channel is high input and DI3 LED is OFF;

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* [0] DI2 channel is low input;

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* [1] DI1 channel is high input and DI1 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

1.

11.

111. AT+MOD=2, (Double DI Counting)

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**For LT-33222-L**: this mode the **DI3** is used as a counting pin. Counting on DI3 reflect in COUNT1.

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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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|Size(bytes)|4|4|1|1|1

Reserve

)))|MOD

**DIDORO** is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below

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

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|RO1|RO2|FIRST|Reserve|Reserve|DO3|DO2|DO1

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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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Note: DO3 bit is not valid for LT-22222-L.

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To use counting mode, please run:

AT+MOD=2

ATZ

AT Commands for counting:

**For LT33222-L:**

AT+TRIG1=0,100 (set DI3 port to trigger on low level, valid signal is 100ms)

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AT+TRIG1=1,100 (set DI3 port to trigger on high level, valid signal is 100ms )

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

**For LT22222-L:**

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

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

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

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

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

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

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**For both LT22222-L & LT33222-L**:

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AT+CLRCOUNT clear all countings

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

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11.

111. AT+MOD=3, Single DI Counting + 2 x ACI

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**LT33222-L**: This mode the DI3 is used as a counting pin.

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

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|Size(bytes)|4|2|2|1|1|1

|Value|COUNT1|(((

ACI1

Current

)))|(((

ACI2

Current

)))|DIDORO*|Reserve|MOD

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**DIDORO** is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below

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

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|RO1|RO2|FIRST|Reserve|Reserve|DO3|DO2|DO1

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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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Note: DO3 is not valid for LT-22222-L.

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To use counting mode, please run:

AT+MOD=3

ATZ

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

1.

11.

111. AT+MOD=4, Single DI Counting + 1 x Voltage Counting

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**LT33222-L**: This mode the DI3 is used as a counting pin.

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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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|Size(bytes)|4|4|1|1|1

Reserve

)))|MOD

**DIDORO** is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below

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

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|RO1|RO2|FIRST|Reserve|Reserve|DO3|DO2|DO1

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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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Note: DO3 is not valid for LT-22222-L.

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To use this mode, please run:

AT+MOD=4

ATZ

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

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

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

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

1.

11.

111. AT+MOD=5, Single DI Counting + 2 x AVI + 1 x ACI

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**LT33222-L**: This mode the DI3 is used as a counting pin.

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

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|Size(bytes)|2|2|2|2|1|1|1

|Value|(((

AVI1

voltage

)))|(((

AVI2

voltage

)))|(((

ACI1

Current

)))|COUNT1|DIDORO*|(((

Reserve

)))|MOD

**DIDORO** is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below

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

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|RO1|RO2|FIRST|Reserve|Reserve|DO3|DO2|DO1

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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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Note: DO3 is not valid for LT-22222-L.

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To use this mode, please run:

AT+MOD=5

ATZ

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

1.

11.

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

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**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 à The normal working mode

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* AT+ADDMOD6=1 à 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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|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)

)))

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

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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

)))

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

|(((

AV1_

LOW

)))|(((

AV1_

HIGH

)))|(((

AV2_

LOW

)))|(((

AV2_

HIGH

)))|(((

AC1_

LOW

)))|(((

AC1_

HIGH

)))|(((

AC2_

LOW

)))|(((

AC2_

HIGH

)))

* 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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|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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707

**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.

1.

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/]]

1.

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:

1.

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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11.

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.

827

828

829

* Downlink Payload (prefix 0x AB 06):

830

831

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

832

833

834

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

835

836

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):

849

850

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

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

855

856

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 )

869

870

871

* Downlink Payload (prefix 0x09 01 ):

872

873

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

874

875

876

==== 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 )

891

892

893

* Downlink Payload (prefix 0x09 02 ):

894

895

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

896

897

898

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

899

900

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

* AT Command:

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

905

906

907

* Downlink Payload (prefix 0xAA 01 ):

908

909

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

910

911

912

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

913

914

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

* AT Command:

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

919

920

921

* Downlink Payload (prefix 0xAA 00 ):

922

923

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

924

925

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

926

927

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.

932

933

934

* Downlink Payload (prefix 0xAC ):

935

936

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

937

938

939

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

* AT Command:

There is no AT Command to control Digital Output

944

945

946

* Downlink Payload (prefix 0x02):

947

948

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

949

950

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

951

952

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

953

954

|Downlink Code|DO1|DO2|DO3

955

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

956

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

957

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

958

959

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

960

961

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

972

973

974

* Downlink Payload (prefix 0xA9):

975

976

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

977

978

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

979

980

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

981

982

**Second Byte**: Inverter Mode

983

984

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

985

986

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

987

988

989

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

|Second Byte|Status

|0x01|DO1 set to low

|0x00|DO1 set to high

|0x11|DO1 NO Action

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

|Second Byte|Status

|0x01|DO2 set to low

|0x00|DO2 set to high

|0x11|DO2 NO Action

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

|Second Byte|Status

|0x01|DO3 set to low

|0x00|DO3 set to high

1010

|0x11|DO3 NO Action

1011

1012

**Sixth and Seventh Byte**:

1013

1014

Latching time. Unit: ms

1015

1016

Device will upload a packet if downlink code executes successfully.

Example payload:

1. A9 01 01 01 01 07 D0

1023

1024

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

1025

1026

1027

1. A9 01 00 01 11 07 D0

1028

1029

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

1030

1031

1032

1. A9 00 00 00 00 07 D0

1033

1034

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

1035

1036

1037

1. A9 00 11 01 00 07 D0

1038

1039

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

1049

1050

1051

* Downlink Payload (prefix 0x03):

1052

1053

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

1054

1055

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

1056

1057

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

1058

1059

|Downlink Code|RO1|RO2

1060

|03 00 11|Open|No Action

1061

|03 01 11|Close|No Action

1062

|03 11 00|No Action|Open

1063

|03 11 01|No Action|Close

1064

|03 00 00|Open|Open

1065

|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.

1070

1071

1072

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

* AT Command:

There is no AT Command to control Relay Output

1077

1078

1079

* Downlink Payload (prefix 0x05):

1080

1081

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

1082

1083

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

1084

1085

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

1086

1087

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

1088

1089

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

1090

1091

00: Relays will change to an inverter state after timeout

1092

1093

1094

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

1095

1096

|Value|Status

1097

|0x11|RO1 and RO2 to NO

1098

|0x10|RO2 to NO, RO1 to NC

1099

|0x01|RO2 to NC, RO1 to NO

1100

|0x00|RO1 and RO2 to NC.

1101

|0x20|RO1 No Action, RO2 to NC

1102

|0x21|RO1 No Action, RO2 to NO

1103

|0x02|RO1 to NC, RO2 No Action

1104

|0x12|RO1 to NO, RO2 No Action

1105

1106

1107

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

1108

1109

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 ====

1140

1141

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

* AT Command:

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

1146

1147

1148

* Downlink Payload (prefix 0xA5):

1149

1150

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

1151

1152

1153

==== 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

1166

1167

1168

* Downlink Payload (prefix 0xA8):

1169

1170

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

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

1177

1178

Clear counting for counting mode

* AT Command:

AT+CLRCOUNT ~/~/ clear all counting

1183

1184

1185

* Downlink Payload (prefix 0xA6):

1186

1187

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)

1197

1198

1199

* Downlink Payload (prefix 0xA7):

1200

1201

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

1202

1203

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

1.

11. Integrate with Mydevice

1210

1211

1212

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:

1213

1214

1215

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

1216

1217

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:

1218

1219

1220

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

1221

1222

1223

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

1224

1225

1226

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

Step 3: Create an account or log in Mydevices.

1231

1232

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

1233

1234

Search under The things network

1235

1236

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

1237

1238

1239

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

1240

1241

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

1242

1243

1244

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

1245

1246

1247

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

1248

1249

1250

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

1251

1252

1253

[[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 )

1259

1260

Support NPN Type sensor

1261

1262

[[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)

1269

1270

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

1271

1272

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

1273

1274

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

1275

1276

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

1277

1278

1279

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

1280

1281

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

1282

1283

* Connect sensor’s output to DI1-

1284

* Connect sensor’s VCC to DI1+.

1285

1286

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

1287

1288

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

1289

1290

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.

1291

1292

1293

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

1294

1295

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

1296

1297

* Connect sensor’s output to DI1+

1298

* Connect sensor’s GND DI1-.

1299

1300

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

1301

1302

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

1303

1304

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.

1305

1306

1307

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

1308

1309

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

1310

1311

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

1312

* Connect sensor’s GND DI1-.

1313

1314

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

1315

1316

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

1317

1318

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

1324

1325

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

1326

1327

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

1.

11.

111. Analog Input Interface

1335

1336

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:

1337

1338

AC2 = (IN2 voltage )/12

1339

1340

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

Example to connect a 4~~20mA sensor

1345

1346

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

1347

1348

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]]

1360

1361

[[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:

1370

1371

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

1372

1373

1374

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

1.

11. LEDs Indicators

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

1385

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

1386

|**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.

1387

|**TX**|(((

1388

Device boot: TX blinks 5 times.

1389

1390

Successful join network: TX ON for 5 seconds.

1391

1392

Transmit a LoRa packet: TX blinks once

1393

)))

1394

|**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

1400

1401

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

1402

)))

1403

|**DI2**|(((

1404

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

1405

1406

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

1407

)))

1408

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

1409

|**DI2**|(((

1410

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

1411

1412

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

)))

|**RO1**|

|**RO2**|

1. Use AT Command

11. Access AT Command

1422

1423

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.

1424

1425

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

1426

1427

1428

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:

1429

1430

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

1431

1432

1433

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/]]

1434

1435

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

AT+<CMD> : Run <CMD>

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

1440

1441

AT+<CMD>=? : Get the value

1442

1443

ATZ: Trig a reset of the MCU

1444

1445

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

1446

1447

AT+DEUI: Get or Set the Device EUI

1448

1449

AT+DADDR: Get or Set the Device Address

1450

1451

AT+APPKEY: Get or Set the Application Key

1452

1453

AT+NWKSKEY: Get or Set the Network Session Key

1454

1455

AT+APPSKEY: Get or Set the Application Session Key

1456

1457

AT+APPEUI: Get or Set the Application EUI

1458

1459

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

1460

1461

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

1462

1463

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

1464

1465

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

1466

1467

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

1468

1469

AT+RX2FQ: Get or Set the Rx2 window frequency

1470

1471

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

1472

1473

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

1474

1475

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

1476

1477

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

1478

1479

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

1480

1481

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

1482

1483

AT+NWKID: Get or Set the Network ID

1484

1485

AT+FCU: Get or Set the Frame Counter Uplink

1486

1487

AT+FCD: Get or Set the Frame Counter Downlink

1488

1489

AT+CLASS: Get or Set the Device Class

1490

1491

AT+JOIN: Join network

1492

1493

AT+NJS: Get OTAA Join Status

1494

1495

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

1496

1497

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

1498

1499

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

1500

1501

AT+RECV: Print last received data in raw format

1502

1503

AT+VER: Get current image version and Frequency Band

1504

1505

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

1506

1507

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

1508

1509

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

1510

1511

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

1512

1513

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

1514

1515

AT+PORT: Get or set the application port

1516

1517

AT+DISAT: Disable AT commands

1518

1519

AT+PWORD: Set password, max 9 digits

1520

1521

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

1522

1523

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

1524

1525

AT+CFG: Print all settings

1.

11. Common AT Command Sequence

1531

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

1532

1533

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)

1555

1556

123456 Enter Password to have AT access.

1557

1558

AT+FDR Reset Parameters to Factory Default, Keys Reserve

1559

1560

123456 Enter Password to have AT access.

1561

1562

AT+CLASS=C Set to work in CLASS C

1563

1564

AT+NJM=0 Set to ABP mode

1565

1566

AT+ADR=0 Set the Adaptive Data Rate Off

1567

1568

AT+DR=5 Set Data Rate

1569

1570

AT+TDC=60000 Set transmit interval to 60 seconds

1571

1572

AT+CHS=868400000 Set transmit frequency to 868.4Mhz

1573

1574

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

1575

1576

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

* Program cable x 1

**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

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