Changes for page LT-22222-L -- LoRa I/O Controller User Manual

Last modified by Saxer Lin on 2025/04/15 17:24

From version < 177.1 >

edited by Dilisi S
on 2024/11/08 06:48

To version < 180.1 >

edited by Dilisi S
on 2024/11/09 06:08

Change comment: Nov 8 edits - part 2

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@@ -33,8 +33,6 @@
  With the LT-22222-L I/O Controller, users can transmit data over ultra-long distances with low power consumption using LoRa, a spread-spectrum modulation technique derived from chirp spread spectrum (CSS) technology that operates on license-free ISM bands.
  )))
--> The LT Series I/O Controllers are designed for easy, low-cost installation on LoRaWAN networks.
--
  (((
  You can connect the LT-22222-L I/O Controller to a LoRaWAN network service provider in several ways:
@@ -59,7 +59,7 @@
  * SX1276/78 Wireless Chip
  * Power Consumption:
  ** Idle: 4mA@12v
--** 20dB Transmit: 34mA@12v
++** 20dB Transmit: 34mA@12V
  * Operating Temperature: -40 ~~ 85 Degrees, No Dew
  (% style="color:#037691" %)**Interface for Model: LT22222-L:**
@@ -68,7 +68,7 @@
  * 2 x Digital Output (NPN output. Max pull-up voltage 36V,450mA)
  * 2 x Relay Output (5A@250VAC / 30VDC)
  * 2 x 0~~20mA Analog Input (res:0.01mA)
--* 2 x 0~~30V Analog Input (res:0.01v)
++* 2 x 0~~30V Analog Input (res:0.01V)
  * Power Input 7~~ 24V DC.
  (% style="color:#037691" %)**LoRa Spec:**
@@ -136,10 +136,10 @@
  * 1 x LT-22222-L I/O Controller
  * 1 x LoRaWAN antenna matched to the frequency of the LT-22222-L
--* 1 x bracket for wall mounting
++* 1 x bracket for DIN rail mounting
  * 1 x programming cable
--Attach the LoRaWAN antenna to the antenna connector, ANT,** **located on the top right side of the device, next to the upper terminal block. Secure the antenna by tightening it clockwise.
++Attach the LoRaWAN antenna to the antenna connector, **ANT**,** **located on the top right side of the device, next to the upper terminal block. Secure the antenna by tightening it clockwise.
  == 2.2 Terminals ==
@@ -171,7 +171,7 @@
  == 2.3 Powering the LT-22222-L ==
--The LT-22222-L I/O Controller can be powered by a 7–24V DC power source. Connect the power supply’s positive wire to the VIN and the negative wire to the GND screw terminals. The power indicator (PWR) LED will turn on when the device is properly powered.
++The LT-22222-L I/O Controller can be powered by a **7–24V DC** power source. Connect the power supply’s positive wire to the VIN and the negative wire to the GND screw terminals. The power indicator (PWR) LED will turn on when the device is properly powered.
  [[image:1653297104069-180.png]]
@@ -183,13 +183,13 @@
  By default, the LT-22222-L is configured to operate in LoRaWAN Class C mode. It supports OTAA (Over-the-Air Activation), the most secure method for activating a device with a LoRaWAN network server. The LT-22222-L comes with device registration information that allows you to register it with a LoRaWAN network, enabling the device to perform OTAA activation with the network server upon initial power-up and after any subsequent reboots.
--For LT-22222-L, the LED will show the Join status: After powering on, the TX LED will fast-blink 5 times which means the LT-22222-L will enter the working mode and start to JOIN the LoRaWAN network. The TX LED will be on for 5 seconds after joining the network. When there is a message from the server, the RX LED will be on for 1 second.
++After powering on, the **TX LED** will **fast-blink 5 times** which means the LT-22222-L will enter the **work mode** and start to **join** the LoRaWAN network. The **TX LED** will be on for **5 seconds** after joining the network. When there is a **downlink** message from the server, the **RX LE**D will be on for **1 second**. When the device is sending an uplink message to the server, the **TX LED** will be on for **1 second**. See also LED status.
  In case you can't set the root key and other identifiers in the network server and must use them from the server, you can use [[AT Commands>>||anchor="H4.UseATCommand"]] to configure them on the device.
  == 3.2 Registering with a LoRaWAN network server ==
--The diagram below shows how the LT-22222-L connects to a typical LoRaWAN network.
++The network diagram below shows how the LT-22222-L is connected to a typical LoRaWAN network.
  [[image:image-20220523172350-1.png||height="266" width="864"]]
@@ -207,8 +207,10 @@
  * Create an application if you do not have one yet.
  * Register LT-22222-L with that application. Two registration options are available:
--==== Using the LoRaWAN Device Repository: ====
++====   ====
++==== 3.2.2.1 Using the LoRaWAN Device Repository ====
++
  * Go to your application and click on the **Register end device** button.
  * On the **Register end device** page:
  ** Select the option **Select the end device in the LoRaWAN Device Repository**.
@@ -217,7 +217,8 @@
  [[image:lt-22222-l-dev-repo-reg-p1.png||height="625" width="1000"]]
--*
++
++* Page continued...
  ** Enter the **AppEUI** in the **JoinEUI** field and click the **Confirm** button.
  ** Enter the **DevEUI** in the **DevEUI** field.
  ** Enter the **AppKey** in the **AppKey** field.
@@ -226,8 +226,10 @@
  [[image:lt-22222-l-dev-repo-reg-p2.png||height="625" width="1000"]]
--==== Entering device information manually: ====
++====   ====
++==== 3.2.2.2 Entering device information manually ====
++
  * On the **Register end device** page:
  ** Select the **Enter end device specifies manually** option as the input method.
  ** Select the **Frequency plan** that matches your device.
@@ -240,12 +240,13 @@
  [[image:lt-22222-l-manually-p1.png||height="625" width="1000"]]
--* Enter **AppEUI** in the **JoinEUI** field and click the **Confirm** button.
--* Enter **DevEUI** in the **DevEUI** field.
--* Enter **AppKey** in the **AppKey** field.
--* In the **End device ID** field, enter a unique name within this application for your LT-22222-N.
--* Under **After registration**, select the **View registered end device** option.
--* Click the **Register end device** button.
++* Page continued...
++** Enter **AppEUI** in the **JoinEUI** field and click the **Confirm** button.
++** Enter **DevEUI** in the **DevEUI** field.
++** Enter **AppKey** in the **AppKey** field.
++** In the **End device ID** field, enter a unique name within this application for your LT-22222-N.
++** Under **After registration**, select the **View registered end device** option.
++** Click the **Register end device** button.
  [[image:lt-22222-l-manually-p2.png||height="625" width="1000"]]
@@ -252,18 +252,24 @@
  You will be navigated to the **Device overview** page.
++
  [[image:lt-22222-device-overview.png||height="625" width="1000"]]
--==== Joining ====
++==== 3.2.2.3 Joining ====
--Click on **Live data** in the left navigation. Then, power on LT-22222-L. It will join The Things Stack LoRaWAN network server. You can see the **join request**, **join accept**, followed by **uplink data messages** form the device showing in the **Live data** panel.
++Click on **Live data** in the left navigation. The Live data panel for your application will display.
++Power on your LT-22222-L. It will begin joining The Things Stack LoRaWAN network server. In the **Live data** panel, you can see the **join-request** and **join-accept** messages exchanged between the device and the network server. Once successfully joined, the device will send its first **uplink data message** to the application it belongs to (in this example, **dragino-docs**).
++
++
  [[image:lt-22222-join-network.png||height="625" width="1000"]]
--Click on a message with the messge type, **Forward uplink data message**. You can see the  decoded uplink payload as shown below.
++By default, you will receive an uplink data message every 10 minutes.
++Click on one of a **Forward uplink data messages **to see its payload content. The payload content is encapsulated within the decode_payload {} JSON object.
++
  [[image:lt-22222-ul-payload-decoded.png]]
@@ -275,7 +275,7 @@
  == 3.3 Work Modes and their Uplink Payload formats ==
--The LT-22222-L has 5 **work modes**. It also has an interrupt/trigger mode for different types of applications that can be used together with any working mode as an additional feature. The default mode is MOD1 and you can switch between these modes using AT commands.
++The LT-22222-L has 5 **work modes**. It also has an interrupt/trigger mode for different types of applications that can be used together with any work mode as an additional feature. The default mode is MOD1 and you can switch between these modes using AT commands.
  * (% style="color:blue" %)**MOD1**(%%): (default mode/factory set): 2ACI + 2AVI + DI + DO + RO
@@ -289,11 +289,15 @@
  * (% style="color:blue" %)**ADDMOD6**(%%): Trigger Mode, Optional, used together with MOD1 ~~ MOD5
++The uplink messages are sent over LoRaWAN FPort 2. By default, an uplink message is sent every 10 minutes.
++
  === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
  (((
--The uplink payload is 11 bytes long. Uplink messages are sent over LoRaWAN FPort 2. By default, one uplink is sent every 10 minutes. (% style="display:none" wfd-invisible="true" %)
++This is the default mode.
++The uplink payload is 11 bytes long. (% style="display:none" wfd-invisible="true" %)
++
  (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:510px" %)
  |(% style="background-color:#4f81bd; color:white" %)**Size(bytes)**|(% style="background-color:#4f81bd; color:white" %)**2**|(% style="background-color:#4f81bd; color:white" %)**2**|(% style="background-color:#4f81bd; color:white" %)**2**|(% style="background-color:#4f81bd; color:white" %)**2**|(% style="background-color:#4f81bd; color:white" %)**1**|(% style="background-color:#4f81bd; color:white" %)**1**|(% style="background-color:#4f81bd; color:white" %)**1**
  |Value|(((
@@ -340,13 +340,13 @@
  * [1] The RO1 relay channel is CLOSED, and the RO1 LED is ON.
  * [0] The RO2 relay channel is OPEN, and the RO2 LED is OFF.
--* [1] DI3 - not used for LT-22222-L.
++* **[1] DI3 - not used for LT-22222-L.**
  * [0] DI2 channel input is LOW, and the DI2 LED is OFF.
  * [1] DI1 channel input state:
  ** DI1 is FLOATING when no sensor is connected between DI1+ and DI1-.
  ** DI1 is HIGH when a sensor is connected between DI1- and DI1+ and the sensor is ACTIVE.
  ** DI1 LED is ON in both cases.
--* [0] DO3 - not used for LT-22222-L.
++* **[0] DO3 - not used for LT-22222-L.**
  * [1] DO2 channel output is LOW, and the DO2 LED is ON.
  * [0] DO1 channel output state:
  ** DO1 is FLOATING when there is no load between DO1 and V+.
@@ -371,7 +371,7 @@
  )))
  (((
--(% style="color:#4f81bd" %)***DIDORO**(%%) is a combination of RO1, RO2, DO3, DO2 and DO1, and its size is 1 byte long as shown below.
++(% style="color:#4f81bd" %)***DIDORO**(%%) is a combination of RO1, RO2, FIRST, Reserve, Reserve, DO3, DO2 and DO1, and its size is 1 byte long as shown below.
  (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:510px" %)
  |**bit 7**|**bit 6**|**bit 5**|**bit 4**|**bit 3**|**bit 2**|**bit 1**|**bit 0**
@@ -1471,7 +1471,7 @@
  * Click on the **Events **tab.
  * Select **Debug **from the **Event type** dropdown.
--* Select the** time frame** from the **time window**.
++* Select the** time frame** from the **time window**.
  [insert image]
@@ -1727,13 +1727,14 @@
  |**RO1**|For LT-22222-L: ON when RO1 is closed, OFF when RO1 is open
  |**RO2**|For LT-22222-L: ON when RO2 is closed, OFF when RO2 is open
--= 4. Using AT Command =
++= 4. Using AT Commands =
--== 4.1 Connecting the LT-22222-L to a computer ==
++The LT-22222-L supports programming using AT Commands.
++== 4.1 Connecting the LT-22222-L to a PC ==
  (((
--The LT-22222-L supports programming using AT Commands. You can use a USB-to-TTL adapter along with a 3.5mm Program Cable to connect the LT-22222-L to a computer, as shown below.
++You can use a USB-to-TTL adapter along with a 3.5mm Program Cable to connect the LT-22222-L to a PC, as shown below.
  )))
  [[image:1653358238933-385.png]]
@@ -1740,7 +1740,7 @@
  (((
--On the PC, the user needs to set the (% style="color:#4f81bd" %)**serial tool**(%%)(such as [[putty>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) to a baud rate of (% style="color:green" %)**9600**(%%) to access to access serial console of LT-22222-L. The AT commands are disabled by default, and a password (default:(% style="color:green" %)**123456**)(%%) must be entered to active them, as shown below:
++On the PC, you need to set the (% style="color:#4f81bd" %)**serial tool **(%%)(such as [[PuTTY>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]] or [[SecureCRT>>https://www.vandyke.com/cgi-bin/releases.php?product=securecrt]]) to a baud rate of (% style="color:green" %)**9600**(%%) to access the serial console of LT-22222-L. Access to AT commands is disabled by default, and a password (default: (% style="color:green" %)**123456**)(%%) must be entered to enable AT command access, as shown below:
  )))
  [[image:1653358355238-883.png]]
@@ -1748,195 +1748,62 @@
  (((
  You can find more details in the [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
--)))
--(((
--The following table lists all the AT commands related to the LT-22222-L, except for those used for switching between modes.
--
--AT+<CMD>?        : Help on <CMD>
++== 4.2 LT-22222-L related AT commands ==
  )))
  (((
--AT+<CMD>         : Run <CMD>
--)))
++The following is the list of all the AT commands related to the LT-22222-L, except for those used for switching between work modes.
--(((
--AT+<CMD>=<value> : Set the value
++* AT+<CMD>? : Help on <CMD>
++* AT+<CMD> : Run <CMD>
++* AT+<CMD>=<value> : Set the value
++* AT+<CMD>=? : Get the value
++* ATZ: Trigger a reset of the MCU
++* ##**AT+FDR**##: Reset Parameters to factory default, reserve keys
++* **##AT+DEUI##**: Get or set the Device EUI (DevEUI)
++* **##AT+DADDR##**: Get or set the Device Address (DevAddr)
++* **##AT+APPKEY##**: Get or set the Application Key (AppKey)
++* AT+NWKSKEY: Get or set the Network Session Key (NwkSKey)
++* AT+APPSKEY: Get or set the Application Session Key (AppSKey)
++* AT+APPEUI: Get or set the Application EUI (AppEUI)
++* AT+ADR: Get or set the Adaptive Data Rate setting. (0: OFF, 1: ON)
++* AT+TXP: Get or set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Specification)
++* AT+DR:  Get or set the Data Rate. (0-7 corresponding to DR_X)
++* AT+DCS: Get or set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
++* AT+PNM: Get or set the public network mode. (0: off, 1: on)
++* AT+RX2FQ: Get or set the Rx2 window frequency
++* AT+RX2DR: Get or set the Rx2 window data rate (0-7 corresponding to DR_X)
++* AT+RX1DL: Get or set the delay between the end of the Tx and the Rx Window 1 in ms
++* AT+RX2DL: Get or set the delay between the end of the Tx and the Rx Window 2 in ms
++* AT+JN1DL: Get or set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
++* AT+JN2DL: Get or set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
++* AT+NJM: Get or set the Network Join Mode. (0: ABP, 1: OTAA)
++* AT+NWKID: Get or set the Network ID
++* AT+FCU: Get or set the Frame Counter Uplink (FCntUp)
++* AT+FCD: Get or set the Frame Counter Downlink (FCntDown)
++* AT+CLASS: Get or set the Device Class
++* AT+JOIN: Join network
++* AT+NJS: Get OTAA Join Status
++* AT+SENDB: Send hexadecimal data along with the application port
++* AT+SEND: Send text data along with the application port
++* AT+RECVB: Print last received data in binary format (with hexadecimal values)
++* AT+RECV: Print last received data in raw format
++* AT+VER: Get current image version and Frequency Band
++* AT+CFM: Get or Set the confirmation mode (0-1)
++* AT+CFS: Get confirmation status of the last AT+SEND (0-1)
++* AT+SNR: Get the SNR of the last received packet
++* AT+RSSI: Get the RSSI of the last received packet
++* AT+TDC: Get or set the application data transmission interval in ms
++* AT+PORT: Get or set the application port
++* AT+DISAT: Disable AT commands
++* AT+PWORD: Set password, max 9 digits
++* AT+CHS: Get or set the Frequency (Unit: Hz) for Single Channel Mode
++* AT+CHE: Get or set eight channels mode, Only for US915, AU915, CN470
++* AT+CFG: Print all settings
  )))
--(((
--AT+<CMD>=?       :  Get the value
--)))
--(((
--ATZ: Trig a reset of the MCU
--)))
--
--(((
--AT+FDR: Reset Parameters to Factory Default, Keys Reserve
--)))
--
--(((
--AT+DEUI: Get or Set the Device EUI
--)))
--
--(((
--AT+DADDR: Get or Set the Device Address
--)))
--
--(((
--AT+APPKEY: Get or Set the Application Key
--)))
--
--(((
--AT+NWKSKEY: Get or Set the Network Session Key
--)))
--
--(((
--AT+APPSKEY:  Get or Set the Application Session Key
--)))
--
--(((
--AT+APPEUI:    Get or Set the Application EUI
--)))
--
--(((
--AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
--)))
--
--(((
--AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
--)))
--
--(((
--AT+DR:  Get or Set the Data Rate. (0-7 corresponding to DR_X)
--)))
--
--(((
--AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
--)))
--
--(((
--AT+PNM: Get or Set the public network mode. (0: off, 1: on)
--)))
--
--(((
--AT+RX2FQ: Get or Set the Rx2 window frequency
--)))
--
--(((
--AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
--)))
--
--(((
--AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
--)))
--
--(((
--AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
--)))
--
--(((
--AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
--)))
--
--(((
--AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
--)))
--
--(((
--AT+NJM:    Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
--)))
--
--(((
--AT+NWKID: Get or Set the Network ID
--)))
--
--(((
--AT+FCU: Get or Set the Frame Counter Uplink
--)))
--
--(((
--AT+FCD: Get or Set the Frame Counter Downlink
--)))
--
--(((
--AT+CLASS: Get or Set the Device Class
--)))
--
--(((
--AT+JOIN: Join network
--)))
--
--(((
--AT+NJS: Get OTAA Join Status
--)))
--
--(((
--AT+SENDB: Send hexadecimal data along with the application port
--)))
--
--(((
--AT+SEND: Send text data along with the application port
--)))
--
--(((
--AT+RECVB: Print last received data in binary format (with hexadecimal values)
--)))
--
--(((
--AT+RECV: Print last received data in raw format
--)))
--
--(((
--AT+VER:  Get current image version and Frequency Band
--)))
--
--(((
--AT+CFM: Get or Set the confirmation mode (0-1)
--)))
--
--(((
--AT+CFS:  Get confirmation status of the last AT+SEND (0-1)
--)))
--
--(((
--AT+SNR: Get the SNR of the last received packet
--)))
--
--(((
--AT+RSSI: Get the RSSI of the last received packet
--)))
--
--(((
--AT+TDC: Get or set the application data transmission interval in ms
--)))
--
--(((
--AT+PORT: Get or set the application port
--)))
--
--(((
--AT+DISAT: Disable AT commands
--)))
--
--(((
--AT+PWORD: Set password, max 9 digits
--)))
--
--(((
--AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
--)))
--
--(((
--AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
--)))
--
--(((
--AT+CFG: Print all settings
--)))
--
--
  == 4.2 Common AT Command Sequence ==
  === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
@@ -1945,41 +1945,41 @@
  (((
--(% style="color:blue" %)**If device has not joined network yet:**
++(% style="color:blue" %)**If the device has not joined the network yet:**
  )))
  )))
  (((
--(% style="background-color:#dcdcdc" %)**123456**
++(% style="background-color:#dcdcdc" %)##**123456 ~/~/enable AT commands access**##
  )))
  (((
--(% style="background-color:#dcdcdc" %)**AT+FDR**
++(% style="background-color:#dcdcdc" %)##**AT+FDR ~/~/reset parameters to factory default, reserve keys**##
  )))
  (((
--(% style="background-color:#dcdcdc" %)**123456**
++(% style="background-color:#dcdcdc" %)##**123456 ~/~/enable AT commands access**##
  )))
  (((
--(% style="background-color:#dcdcdc" %)**AT+NJM=0**
++(% style="background-color:#dcdcdc" %)##**AT+NJM=0 ~/~/set to ABP mode**##
  )))
  (((
--(% style="background-color:#dcdcdc" %)**ATZ**
++(% style="background-color:#dcdcdc" %)##**ATZ ~/~/reset MCU**##
  )))
  (((
--(% style="color:blue" %)**If device already joined network:**
++(% style="color:blue" %)**If the device has already joined the network:**
  )))
  (((
--(% style="background-color:#dcdcdc" %)**AT+NJM=0**
++(% style="background-color:#dcdcdc" %)##**AT+NJM=0**##
  )))
  (((
--(% style="background-color:#dcdcdc" %)**ATZ**
++(% style="background-color:#dcdcdc" %)##**ATZ**##
  )))
@@ -2085,29 +2085,42 @@
  = 6. FAQ =
--== 6.1 How to upgrade the image? ==
++This section contains some frequently asked questions, which can help you resolve common issues and find solutions quickly.
++== 6.1 How to update the firmware? ==
--The LT-22222-L I/O Controller is shipped with a 3.5mm cable, which is used to upload an image to LT in order to:
++Dragino frequently releases firmware updates for the LT-22222-L.
--* Support new features.
--* Fix bugs.
--* Change LoRaWAN bands.
++Updating your LT-22222-L with the latest firmware version helps to:
--Below is the hardware connection setup for uploading an image to the LT:
++* Support new features
++* Fix bugs
++* Change LoRaWAN frequency bands
++You will need the following things before proceeding:
++
++* 3.5mm programming cable (included with the LT-22222-L as an additional accessory)
++* USB to TTL adapter
++* Download and install the [[STM32 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]]. (replaced by STM32CubeProgrammer)
++* Download the latest firmware image from [[LT-22222-L firmware image files>>https://www.dropbox.com/sh/g99v0fxcltn9r1y/AACrbrDN0AqLHbBat0ViWx5Da/LT-22222-L/Firmware?dl=0&subfolder_nav_tracking=1]]. Check the file name of the firmware to find the correct region.
++
++{{info}}
++As of this writing, the latest firmware version available for the LT-22222-L is v1.6.1.
++{{/info}}
++
++Below is the hardware setup for uploading a firmware image to the LT-22222-L:
++
++
  [[image:1653359603330-121.png]]
--(((
--(% style="color:#0000ff" %)**Step 1**(%%)**:** Download the F[[lash 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]].
--(% style="color:#0000ff" %)**Step 2**(%%)**:** Download the [[LT Image files>>https://www.dropbox.com/sh/g99v0fxcltn9r1y/AACrbrDN0AqLHbBat0ViWx5Da/LT-22222-L/Firmware?dl=0&subfolder_nav_tracking=1]].
--(% style="color:#0000ff" %)**Step 3**(%%)**:** Open the Flash Loader and choose the correct COM port to update.
--
++Start the STM32 Flash Loader and choose the correct COM port to update.
  (((
++(((
  (% style="color:blue" %)**For LT-22222-L**(%%):
--Hold down the PRO button, then momentarily press the RST reset button. The (% style="color:red" %)**DO1 LED**(%%) will change from OFF to ON. When the (% style="color:red" %)**DO1 LED**(%%) is ON, it indicates that the device is in download mode.
++
++Hold down the **PRO** button, then briefly press the **RST** button. The **DO1** LED will change from OFF to ON. When the **DO1** LED is ON, it indicates that the device is in firmware download mode.
  )))
@@ -2129,7 +2129,7 @@
  (((
  (((
--== 6.2 How to change the LoRa Frequency Bands/Region? ==
++== 6.2 How to change the LoRaWAN frequency band/region? ==
  )))
@@ -2142,7 +2142,7 @@
  (((
--== 6.3 How to set up LT to work with a Single Channel Gateway, such as LG01/LG02? ==
++== 6.3 How to setup LT to work with a Single Channel Gateway, such as LG01/LG02? ==
  )))
@@ -2219,61 +2219,55 @@
  Please see this link: [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/How%20to%20set%20the%20transmit%20time%20interval/>>url:http://wiki.dragino.com/xwiki/bin/view/Main/How%20to%20set%20the%20transmit%20time%20interval/]]
--== 6.5 Can I see the counting event in Serial? ==
++== 6.5 Can I see the counting event in the serial output? ==
  (((
--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.
++You can run the AT command AT+DEBUG to view the counting event in the serial output. If the firmware is too old and doesn’t support AT+DEBUG, update to the latest firmware first.
  == 6.6 Can I use point-to-point communication with LT-22222-L? ==
--Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]. this is [[firmware>>https://github.com/dragino/LT-22222-L/releases]].
--
--
++Yes, you can. Please refer to the [[Point-to-Point Communication of LT-22222-L>>https://wiki.dragino.com/xwiki/bin/view/Main/%20Point%20to%20Point%20Communication%20of%20LT-22222-L/]] page. The firmware that supports point-to-point communication can be found [[here>>https://github.com/dragino/LT-22222-L/releases]].
  )))
  (((
--== 6.7 Why does the relay output become the default and open relay after the lt22222 is powered off? ==
++== 6.7 Why does the relay output default to an open relay after the LT-22222-L is powered off? ==
--If the device is not shut down, but directly powered off.
++* If the device is not properly shut down and is directly powered off.
++* It will default to a power-off state.
++* In modes 2 to 5, the DO/RO status and pulse count are saved to flash memory.
++* After a restart, the status before the power failure will be read from flash.
--It will default that this is a power-off state.
++== 6.8 Can I setup LT-22222-L as a NC (Normally Closed) relay? ==
--In modes 2 to 5, DO RO status and pulse count are saved in flash.
--After restart, the status before power failure will be read from flash.
++The LT-22222-L's built-in relay is Normally Open (NO). You can use an external relay to achieve a Normally Closed (NC) configuration. The circuit diagram is shown below:
--== 6.8 Can i set up LT-22222-L as a NC(Normal Close) Relay? ==
--
--
--LT-22222-L built-in relay is NO (Normal Open). User can use an external relay to achieve Normal Close purpose. Diagram as below:
--
--
  [[image:image-20221006170630-1.png||height="610" width="945"]]
--== 6.9 Can LT22222-L save RO state? ==
++== 6.9 Can the LT-22222-L save the RO state? ==
--Firmware version needs to be no less than 1.6.0.
++The firmware version must be at least 1.6.0.
--== 6.10 Why does the LT22222 always report 15.585V when measuring AVI? ==
++== 6.10 Why does the LT-22222-L always report 15.585V when measuring the AVI? ==
--It is likely that the GND is not connected during the measurement, or the wire connected to the GND is loose.
++It is likely that the GND is not connected during the measurement, or that the wire connected to the GND is loose.
--= 7. Trouble Shooting =
++= 7. Troubleshooting =
  )))
  (((
  (((
--== 7.1 Downlink doesn't work, how to solve it? ==
++== 7.1 Downlink isn't working. How can I solve this? ==
  )))
@@ -2280,42 +2280,42 @@
  )))
  (((
--Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
++Please refer to this link for debugging instructions: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
  )))
  (((
--== 7.2 Have trouble to upload image. ==
++== 7.2 Having trouble uploading an image? ==
  )))
  (((
--See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
++Please refer to this link for troubleshooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
  )))
  (((
--== 7.3 Why I can't join TTN in US915 /AU915 bands? ==
++== 7.3 Why can't I join TTN in the US915 /AU915 bands? ==
  )))
  (((
--It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
++It might be related to the channel mapping. [[Please refer to this link for details.>>https://github.com/dragino/LT-22222-L/releases]]
  )))
--== 7.4 Why can LT22222 perform Uplink normally, but cannot receive Downlink? ==
++== 7.4 Why can the LT-22222-L perform Uplink normally, but cannot receive Downlink? ==
--The FCD count of the gateway is inconsistent with the FCD count of the node, causing the downlink to remain in the queue state.
--Use this command to bring their counts back together: [[Resets the downlink packet count>>||anchor="H3.4.2.23Resetsthedownlinkpacketcount"]]
++The FCD count of the gateway is inconsistent with the FCD count of the node, causing the downlink to remain in the queue.
++Use this command to synchronize their counts: [[Resets the downlink packet count>>||anchor="H3.4.2.23Resetsthedownlinkpacketcount"]]
--= 8. Order Info =
++= 8. Ordering information =
  (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
@@ -2322,43 +2322,42 @@
  (% style="color:#4f81bd" %)**XXX:**
--* (% style="color:red" %)**EU433**(%%):   LT with frequency bands EU433
--* (% style="color:red" %)**EU868**(%%):   LT with frequency bands EU868
--* (% style="color:red" %)**KR920**(%%):   LT with frequency bands KR920
--* (% style="color:red" %)**CN470**(%%):  LT with frequency bands CN470
--* (% style="color:red" %)**AS923**(%%):   LT with frequency bands AS923
--* (% style="color:red" %)**AU915**(%%):  LT with frequency bands AU915
--* (% style="color:red" %)**US915**(%%):  LT with frequency bands US915
--* (% style="color:red" %)**IN865**(%%):   LT with frequency bands IN865
--* (% style="color:red" %)**CN779**(%%):  LT with frequency bands CN779
++* (% style="color:red" %)**EU433**(%%): LT with frequency bands EU433
++* (% style="color:red" %)**EU868**(%%): LT with frequency bands EU868
++* (% style="color:red" %)**KR920**(%%): LT with frequency bands KR920
++* (% style="color:red" %)**CN470**(%%): LT with frequency bands CN470
++* (% style="color:red" %)**AS923**(%%): LT with frequency bands AS923
++* (% style="color:red" %)**AU915**(%%): LT with frequency bands AU915
++* (% style="color:red" %)**US915**(%%): LT with frequency bands US915
++* (% style="color:red" %)**IN865**(%%): LT with frequency bands IN865
++* (% style="color:red" %)**CN779**(%%): LT with frequency bands CN779
--= 9. Packing Info =
++= 9. Packing information =
--**Package Includes**:
++**Package includes**:
  * LT-22222-L I/O Controller x 1
  * Stick Antenna for LoRa RF part x 1
  * Bracket for controller x1
--* Program cable x 1
++* 3.5mm Programming cable x 1
  **Dimension and weight**:
  * Device Size: 13.5 x 7 x 3 cm
--* Device Weight: 105g
++* Device Weight: 105 g
  * Package Size / pcs : 14.5 x 8 x 5 cm
--* Weight / pcs : 170g
++* Weight / pcs : 170 g
  = 10. 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.
++Support is available Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different time zones, we cannot offer live support. However, your questions will be answered as soon as possible within the aforementioned schedule.
  )))
  * (((
--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 [[Support@dragino.cc>>mailto:Support@dragino.cc]]
++Please provide as much information as possible regarding your inquiry (e.g., product models, a detailed description of the problem, steps to replicate it, etc.) and send an email to [[support@dragino.cc>>mailto:support@dragino.cc]]
--
  )))

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