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

Last modified by Kilight Cao on 2025/07/03 15:34

From 49.1 to 48.1 From 52.2 to 52.1

From version 52.1

edited by Kilight Cao
on 2025/07/03 14:56

Change comment: Uploaded new attachment "1653358355238-883.png", version {1}

To version 49.1

edited by Kilight Cao
on 2025/07/03 14:42

Change comment: Uploaded new attachment "image-20220524100215-10.png", version {1}

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@@ -46,7 +46,6 @@
  )))
--[[image:lorawan-nw.jpg]]
  == 1.2 Specifications ==
@@ -58,7 +58,7 @@
  ** 20dB Transmit: 34mA@12V
  * Operating Temperature: -40 ~~ 85 Degrees, No Dew
--(% style="color:#037691" %)**Interface for Model: LT22222-LA:**
++(% style="color:#037691" %)**Interface for Model: LT22222-L:**
  * 2 x Digital dual direction Input (Detect High/Low signal, Max: 50V, or 220V with optional external resistor)
  * 2 x Digital Output (NPN output. Max pull-up voltage 36V,450mA)
@@ -112,11 +112,11 @@
  == 1.5 Hardware Variants ==
--(% border="1" cellspacing="3" style="width:531.222px" %)
--|(% style="background-color:#4f81bd; color:white; width:108px" %)**Model**|(% style="background-color:#4f81bd; color:white; width:158px" %)**Photo**|(% style="background-color:#4f81bd; color:white; width:261px" %)**Description**
--|(% style="width:108px" %)**LT-22222-LA**|(% style="width:158px" %)(((
--         [[image:lt33222-l.jpg]]
--)))|(% style="width:261px" %)(((
++(% border="1" cellspacing="3" style="width:510px" %)
++|(% style="background-color:#4f81bd; color:white; width:94px" %)**Model**|(% style="background-color:#4f81bd; color:white; width:172px" %)**Photo**|(% style="background-color:#4f81bd; color:white; width:244px" %)**Description**
++|(% style="width:94px" %)**LT-33222-L**|(% style="width:172px" %)(((
++
++)))|(% style="width:256px" %)(((
  * 3 x Digital Input (Bi-direction)
  * 3 x Digital Output
  * 2 x Relay Output (5A@250VAC / 30VDC)
@@ -140,7 +140,7 @@
  == 2.2 Terminals ==
--The  LT-22222-LA has two screw terminal blocks. The upper screw terminal block has 6 screw terminals and the lower screw terminal block has 10 screw terminals.
++The  LT-22222-L has two screw terminal blocks. The upper screw terminal block has 6 screw terminals and the lower screw terminal block has 10 screw terminals.
  **Upper screw terminal block (from left to right):**
@@ -168,42 +168,40 @@
  |(% style="width:125px" %)DO2|(% style="width:128px" %)Digital Output 2
  |(% style="width:125px" %)DO1|(% style="width:128px" %)Digital Output 1
--== 2.3 Connecting LT-22222-LA to a Power Source ==
++== 2.3 Connecting LT-22222-L to a Power Source ==
  The LT-22222-L I/O Controller can be powered by a **7–24V DC** power source. Connect your 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.
  {{warning}}
--**We recommend that you power on the LT-22222-LA after adding its registration information to the LoRaWAN network server. Otherwise, the device will continuously send join-request messages to attempt to join a LoRaWAN network but will fail.**
++**We recommend that you power on the LT-22222-L after adding its registration information to the LoRaWAN network server. Otherwise, the device will continuously send join-request messages to attempt to join a LoRaWAN network but will fail.**
  {{/warning}}
--[[image:1653297104069-180.png]]
--= 3. Registering LT-22222-LA with a LoRaWAN Network Server =
++= 3. Registering LT-22222-L with a LoRaWAN Network Server =
--The LT-22222-LA supports both OTAA (Over-the-Air Activation) and ABP (Activation By Personalization) methods to activate with a LoRaWAN Network Server. However, OTAA is the most secure method for activating a device with a LoRaWAN Network Server. OTAA regenerates session keys upon initial registration and regenerates new session keys after any subsequent reboots. By default, the LT-22222-LA is configured to operate in LoRaWAN Class C mode.
++The LT-22222-L supports both OTAA (Over-the-Air Activation) and ABP (Activation By Personalization) methods to activate with a LoRaWAN Network Server. However, OTAA is the most secure method for activating a device with a LoRaWAN Network Server. OTAA regenerates session keys upon initial registration and regenerates new session keys after any subsequent reboots. By default, the LT-22222-L is configured to operate in LoRaWAN Class C mode.
  == 3.1 Prerequisites ==
--The LT-22222-LA comes with device registration information such as DevEUI, AppEUI, and AppKey which allows you to register it with a LoRaWAN network. This registration information can be found on a sticker that can be found inside the package. Please keep the **registration information** sticker in a safe place for future reference.
++The LT-22222-L comes with device registration information such as DevEUI, AppEUI, and AppKey which allows you to register it with a LoRaWAN network. This registration information can be found on a sticker that can be found inside the package. Please keep the **registration information** sticker in a safe place for future reference.
  {{info}}
  If you are unable to set the provided root key and other identifiers in the network server, you must generate new keys and identifiers with the network server and configure the device with them using AT commands.
  {{/info}}
--The following subsections explain how to register the LT-22222-LA with different LoRaWAN network server providers.
++The following subsections explain how to register the LT-22222-L with different LoRaWAN network server providers.
--[[image:image-20230425173427-2.png]]
  == 3.2 The Things Stack ==
--This section guides you through how to register your LT-22222-LA with The Things Stack Sandbox.
++This section guides you through how to register your LT-22222-L with The Things Stack Sandbox.
  {{info}}
  The Things Stack Sandbox was formally called The Things Stack Community Edition.
@@ -210,10 +210,11 @@
  {{/info}}
--The network diagram below illustrates the connection between the LT-22222-LA and The Things Stack, as well as how the data can be integrated with the ThingsEye IoT platform.
++The network diagram below illustrates the connection between the LT-22222-L and The Things Stack, as well as how the data can be integrated with the ThingsEye IoT platform.
--[[image:1751523649311-511.png||height="407" width="1378"]]
++[[image:dragino-lorawan-nw-lt-22222-n.jpg||height="374" width="1400"]]
++
  {{info}}
   You can use a LoRaWAN gateway, such as the [[Dragino LPS8N>>https://www.dragino.com/products/lora-lorawan-gateway/item/200-lps8n.html]], to expand or create LoRaWAN coverage in your area.
  {{/info}}
@@ -241,25 +241,25 @@
  *** **Profile (Region)**: Select the region that matches your device.
  ** Select the **Frequency plan** that matches your device from the **Frequency plan** dropdown list.
--[[image:lt-22222-l-dev-repo-reg-p1.png]]
++
  * Register end device page continued...
  ** Enter the **AppEUI** in the **JoinEUI** field and click the **Confirm** button. If The Things Stack accepts the JoinEUI you provided, it will display the message 'This end device can be registered on the network'.
  ** In the **DevEUI** field, enter the **DevEUI**.
  ** In the **AppKey** field, enter the **AppKey.**
--** In the **End device ID** field, enter a unique name for your LT-22222-LA within this application.
++** In the **End device ID** field, enter a unique name for your LT-22222-L within this application.
  ** Under **After registration**, select the **View registered end device** option.
  ** Click **Register end device** button.
--[[image:lt-22222-l-dev-repo-reg-p2.png]]
++
  * You will be navigated to the **Device overview** page.
--[[image:lt-22222-device-overview.png]]
++
  ==== 3.2.1.2 Adding device manually ====
@@ -272,14 +272,14 @@
  ** Select the option **Over the air activation (OTAA)** under the **Activation mode.**
  ** Select **Class C (Continuous)** from the **Additional LoRaWAN class capabilities** dropdown list.
--[[image:lt-22222-l-manually-p1.png]]
++
  * Register end device page continued...
  ** Enter the **AppEUI** in the **JoinEUI** field and click the **Confirm** button. If The Things Stack accepts the JoinEUI you provided, it will display the message '//**This end device can be registered on the network**//'
  ** In the **DevEUI** field, enter the **DevEUI**.
  ** In the **AppKey** field, enter the **AppKey**.
--** In the **End device ID** field, enter a unique name for your LT-22222-LA within this application.
++** In the **End device ID** field, enter a unique name for your LT-22222-N within this application.
  ** Under **After registration**, select the **View registered end device** option.
  ** Click the **Register end device** button.
@@ -288,25 +288,25 @@
  You will be navigated to the **Device overview** page.
++
  [[image:lt-22222-device-overview.png]]
--
  === 3.2.2 Joining ===
--On the end device's page (in this case, lt-22222-la), click on **Live data** tab. The Live data panel for your device will display. Initially, it is blank.
++On the end device's page (in this case, lt-22222-l), click on **Live data** tab. The Live data panel for your device will display. Initially, it is blank.
--Now power on your LT-22222-LA. The **TX LED** will **fast-blink 5 times** which means the LT-22222-LA will enter the **work mode** and start to **join** The Things Stack network server. The **TX LED** will be on for **5 seconds** after joining the network. In the **Live data** panel, you can see the **join-request** and **join-accept** messages exchanged between the device and the network server.
++Now power on your LT-22222-L. The **TX LED** will **fast-blink 5 times** which means the LT-22222-L will enter the **work mode** and start to **join** The Things Stack network server. The **TX LED** will be on for **5 seconds** after joining the network. In the **Live data** panel, you can see the **join-request** and **join-accept** messages exchanged between the device and the network server.
++
  [[image:lt-22222-l-joining.png]]
--
  === 3.2.3 Uplinks ===
--After successfully joining, the device will send its first **uplink data message** to The Things Stack application it belongs to (in this example, it is **dragino-docs**). When the LT-22222-LA sends an uplink message to the server, the **TX LED** turns on for **1 second**. By default, you will receive an uplink data message from the device every 10 minutes.
++After successfully joining, the device will send its first **uplink data message** to The Things Stack application it belongs to (in this example, it is **dragino-docs**). When the LT-22222-L sends an uplink message to the server, the **TX LED** turns on for **1 second**. By default, you will receive an uplink data message from the device every 10 minutes.
  Click on one of the **Forward uplink data messages **to see its payload content. The payload content is encapsulated within the **decode_payload {}** JSON object.
@@ -324,6 +324,7 @@
  We have written a payload formatter that resolves some decoding issues present in The Things Stack Device Repository payload formatter. You can add it under the **Custom JavaScript formatter**. It can be found [[here>>https://github.com/dragino/dragino-end-node-decoder/blob/main/LT22222-L/v1.6_decoder_ttn%20.txt]]:
++(% class="wikigeneratedid" %)
  [[image:lt-22222-l-js-custom-payload-formatter.png]]
@@ -336,7 +336,7 @@
  == 3.3 Working Modes and Uplink Payload formats ==
--The LT-22222-LA has 5 **working 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 **working 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.
  * (% style="color:blue" %)**MOD1**(%%): (default mode/factory set): 2ACI + 2AVI + DI + DO + RO
@@ -389,7 +389,7 @@
  * DI is for digital input. DIx=1: HIGH or FLOATING, DIx=0: LOW.
  * DO is for reverse digital output. DOx=1: LOW, DOx=0: HIGH or FLOATING.
--(% style="color:red" %)**Note: DI3 and DO3 bits are not valid for LT-22222-LA**
++(% style="color:red" %)**Note: DI3 and DO3 bits are not valid for LT-22222-L**
  For example, if the payload is: [[image:image-20220523175847-2.png]]
@@ -408,13 +408,13 @@
  * [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-LA.**
++* **[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-LA.**
++* **[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+.
@@ -430,7 +430,7 @@
  (((
--**For LT-22222-LA**: In this mode, **DI1 and DI2** are used as counting pins.
++**For LT-22222-L**: In this mode, **DI1 and DI2** are used as counting pins.
  )))
  (((
@@ -461,7 +461,7 @@
  * DO is for reverse digital output. DOx=1: LOW, DOx=0: HIGH or FLOATING.
  (((
--(% style="color:red" %)**Note: DO3 bit is not valid for LT-22222-LA**
++(% style="color:red" %)**Note: DO3 bit is not valid for LT-22222-L**
  )))
@@ -486,7 +486,7 @@
  )))
  (((
--**For LT22222-LA:**
++**For LT22222-L:**
  (% style="color:blue" %)**AT+TRIG1=0,100**(%%)** (sets the DI1 port to trigger on a LOW level. The valid signal duration is 100ms) **
@@ -504,8 +504,6 @@
--
--
  === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
@@ -513,7 +513,7 @@
  The maximum count for four bytes is FFFFFFFF (hex) = 4294967295 (dec).
  It starts counting again when it reaches the maximum value.**
--**LT22222-LA**: In this mode, the DI1 is used as a counting pin.
++**LT22222-L**: In this mode, the DI1 is used as a counting pin.
  (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:510px" %)
  |(% style="background-color:#4f81bd; color:white" %)**Size(bytes)**|(% style="background-color:#4f81bd; color:white" %)**4**|(% 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**
@@ -536,14 +536,12 @@
  * DO is for reverse digital output. DOx=1: output low, DOx=0: high or floating.
  (((
--(% style="color:red" %)**Note: DO3 bit is not valid for LT-22222-LA.**
++(% style="color:red" %)**Note: DO3 bit is not valid for LT-22222-L.**
  )))
--
--
  (((
  **To activate this mode, run the following AT commands:**
  )))
@@ -573,7 +573,7 @@
  (((
--**LT22222-LA**: In this mode, the DI1 is used as a counting pin.
++**LT22222-L**: In this mode, the DI1 is used as a counting pin.
  )))
  (((
@@ -636,8 +636,6 @@
--
--
  === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
@@ -675,7 +675,7 @@
  )))
  (((
--(% style="color:red" %)**Note: DO3 bit is not valid for LT-22222-LA.**
++(% style="color:red" %)**Note: DO3 bit is not valid for LT-22222-L.**
  )))
  (((
@@ -698,8 +698,6 @@
--
--
  === 3.3.6 AT+ADDMOD~=6 (Trigger Mode, Optional) ===
@@ -710,7 +710,7 @@
  * **AT+MOD=1 **            **~-~->**   Sets the default working mode
  * **AT+ADDMOD6=1**   **~-~->**   Enables trigger mode
--The LT-22222-LA will continuously monitor AV1, AV2, AC1, and AC2 every 5 seconds. It will send uplink packets in two cases:
++The LT-22222-L will continuously monitor AV1, AV2, AC1, and AC2 every 5 seconds. It will send uplink packets in two cases:
 . Periodic uplink: Based on TDC time. The payload is the same as in normal mode (MOD=1 as set above). These are (% style="color:#4f81bd" %)**unconfirmed**(%%) uplinks.
 . (((
@@ -892,11 +892,11 @@
  )))
--== 3.4 Configure LT-22222-LA via AT Commands or Downlinks ==
++== 3.4 Configure LT-22222-L via AT Commands or Downlinks ==
  (((
--You can configure LT-22222-LA I/O Controller via AT Commands or LoRaWAN Downlinks.
++You can configure LT-22222-L I/O Controller via AT Commands or LoRaWAN Downlinks.
  )))
  (((
@@ -921,7 +921,7 @@
  === 3.4.2 Sensor-related commands ===
--These commands are specially designed for the LT-22222-LA. Commands can be sent to the device using options such as an AT command or a LoRaWAN downlink payload.
++These commands are specially designed for the LT-22222-L. Commands can be sent to the device using options such as an AT command or a LoRaWAN downlink payload.
  ==== 3.4.2.1 Set Transmit/Uplink Interval ====
@@ -968,7 +968,7 @@
  See [[RapidTables>>https://www.rapidtables.com/convert/number/decimal-to-hex.html?x=30]]
--[[image:Screenshot%202024-11-23%20at%2018.27.11.png||alt="Screenshot 2024-11-23 at 18.27.11.png"]]
++[[image:Screenshot 2024-11-23 at 18.27.11.png]]
  )))
  ==== 3.4.2.2 Set the Working Mode (AT+MOD) ====
@@ -1032,7 +1032,7 @@
  ==== 3.4.2.3 Request an uplink from the device ====
--Requests an uplink from LT-22222-LA. The content of the uplink payload varies based on the device's current working mode.
++Requests an uplink from LT-22222-L. The content of the uplink payload varies based on the device's current working mode.
  (% style="color:#037691" %)**AT command**
@@ -1573,7 +1573,7 @@
  (% style="color:#4f81bd" %)**Third byte (bb)**(%%): Control Method and Ports status:
--[[image:image-20221008095908-1.png]]
++[[image:image-20221008095908-1.png||height="364" width="564"]]
  (% style="color:#4f81bd" %)**Fourth/Fifth/Sixth/Seventh bytes (cc)**(%%): Latching time. Unit: ms
@@ -2024,7 +2024,7 @@
  We use The Things Stack Sandbox in this example:
--* In **The Things Stack Sandbox**, go to the **Application **for the LT-22222-LA you added.
++* In **The Things Stack Sandbox**, go to the **Application **for the LT-22222-L you added.
  * Select **MQTT** under **Integrations** in the left menu.
  * In the **Connection information **section, under **Connection credentials**, The Things Stack displays an auto-generated **username**. You can use it or provide a new one.
  * Click the **Generate new API key** button to generate a password. You can view it by clicking on the **visibility toggle/eye** icon. The API key works as the password.
@@ -2145,7 +2145,7 @@
  ==== 3.5.2.4 Viewing sensor data on a dashboard ====
--You can create a dashboard with ThingsEye to visualize the sensor data coming from the LT-22222-LA. The following image shows a dashboard created for the LT-22222-LA. See **Creating a dashboard** in ThingsEye documentation for more information.
++You can create a dashboard with ThingsEye to visualize the sensor data coming from the LT-22222-L. The following image shows a dashboard created for the LT-22222-L. See **Creating a dashboard** in ThingsEye documentation for more information.
  [[image:lt-22222-l-dashboard.png]]
@@ -2164,17 +2164,18 @@
  (((
--The DI ports of the LT-22222-LA can support **NPN**, **PNP**, or **dry contact** output sensors.
++The DI ports of the LT-22222-L can support **NPN**, **PNP**, or **dry contact** output sensors.
  )))
  (((
  (((
--The part of the internal circuit of the LT-22222-LA shown below includes the NEC2501 photocoupler. The active current from NEC2501 pin 1 to pin 2 is 1 mA, with a maximum allowable current of 50 mA. When active current flows from NEC2501 pin 1 to pin 2, the DI becomes active HIGH and the DI LED status changes.
++The part of the internal circuit of the LT-22222-L shown below includes the NEC2501 photocoupler. The active current from NEC2501 pin 1 to pin 2 is 1 mA, with a maximum allowable current of 50 mA. When active current flows from NEC2501 pin 1 to pin 2, the DI becomes active HIGH and the DI LED status changes.
--[[image:1653357170703-587.png]]
++
  )))
  )))
++[[image:1653357170703-587.png]]
  (((
  (((
@@ -2206,11 +2206,11 @@
  )))
  (((
--**= DI1**+** / 1K.**
++[[image:1653968155772-850.png||height="23" width="19"]]**= DI1**+** / 1K.**
  )))
  (((
--For example, if** DI1+ **= **12V**, the resulting current is = 12mA. Therefore, the LT-22222-L will be able to detect this active signal.
++For example, if** DI1+ **= **12V**, the resulting current is [[image:1653968155772-850.png||height="23" width="19"]]= 12mA. Therefore, the LT-22222-L will be able to detect this active signal.
  )))
  (((
@@ -2237,11 +2237,11 @@
  )))
  (((
--**= DI1+ / 1K.**
++[[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
  )))
  (((
--If **DI1+ = 24V**, the resulting current is 24mA, Therefore, the LT-22222-L will detect this high-active signal.
++If **DI1+ = 24V**, the resulting current[[image:1653968155772-850.png||height="23" width="19"]] is 24mA, Therefore, the LT-22222-L will detect this high-active signal.
  )))
  (((
@@ -2268,18 +2268,16 @@
  )))
  (((
--   **= DI1+ / 51K.**
++   [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
  )))
  (((
--If the sensor output is 220V, then (% wfd-invisible="true" id="cke_bm_243359S" style="display:none" %)[[image:image-20220524095628-8.png]](%%) = DI1+ / 51K  = 4.3mA. Therefore, the LT-22222-L will be able to safely detect this high-active signal.
++If the sensor output is 220V, then [[image:1653968155772-850.png||height="23" width="19"]](% wfd-invisible="true" id="cke_bm_243359S" style="display:none" %)[[image:image-20220524095628-8.png]](%%) = DI1+ / 51K  = 4.3mA. Therefore, the LT-22222-L will be able to safely detect this high-active signal.
  )))
--
--
  (% style="color:blue" %)**Example 4**(%%): Connecting to a Dry Contact sensor
  From the DI port circuit above, activating the photocoupler requires a voltage difference between the DI+ and DI- ports. However, the Dry Contact sensor is a passive component and cannot provide this voltage difference on its own.
@@ -2290,9 +2290,9 @@
  (% style="color:blue" %)**Example 5**(%%): Connecting to an Open Collector
--
  [[image:image-20240219115718-1.png]]
++
  === 3.6.3 Digital Output Ports: DO1/DO2 ===
@@ -2306,7 +2306,7 @@
  === 3.6.4 Analog Input Interfaces ===
--The analog input interface is shown below. The LT-22222-LA will measure the IN2 voltage to calculate the current passing through the load. The formula is:
++The analog input interface is shown below. The LT-22222-L will measure the IN2 voltage to calculate the current passing through the load. The formula is:
  (% style="color:blue" %)**AC2 = (IN2 voltage )/12**
@@ -2330,16 +2330,16 @@
  [[image:1653357640609-758.png]]
--[[image:1653357648330-671.png]]
++[[image:1653357648330-671.png||height="155" width="733"]]
  Example: Connecting to a regulated power supply to measure voltage
--[[image:image-20230608101532-1.png]]
++[[image:image-20230608101532-1.png||height="606" width="447"]]
--[[image:image-20230608101608-2.jpeg]]
++[[image:image-20230608101608-2.jpeg||height="379" width="284"]]
--[[image:image-20230608101722-3.png]]
++[[image:image-20230608101722-3.png||height="102" width="1139"]]
  (% style="color:blue; font-weight:bold" %)**Specifications of the regulated power supply**(% style="color:blue" %)**:**
@@ -2353,15 +2353,15 @@
  (((
--The LT-22222-LA has two relay interfaces, RO1 and RO2, each using two pins of the screw terminal (ROx-1 and ROx-2 where x is the port number, 1 or 2). You can connect a device's power line in series with one of the relay interfaces (e.g., RO1-1 and RO1-2 screw terminals). See the example below:
++The LT-22222-L has two relay interfaces, RO1 and RO2, each using two pins of the screw terminal (ROx-1 and ROx-2 where x is the port number, 1 or 2). You can connect a device's power line in series with one of the relay interfaces (e.g., RO1-1 and RO1-2 screw terminals). See the example below:
--(% style="color:red" %)**Note:**(%%) The ROx pins will be in the Open (NO) state when the LT-22222-LA is powered off.
++(% style="color:red" %)**Note:**(%%) The ROx pins will be in the Open (NO) state when the LT-22222-L is powered off.
  )))
  [[image:image-20220524100215-9.png]]
--[[image:image-20220524100215-10.png]]
++[[image:image-20220524100215-10.png||height="382" width="723"]]
  == 3.7 LED Indicators ==
@@ -2386,30 +2386,30 @@
  )))
  )))
  |**RX**|RX blinks once when a packet is received.
--|**DO1**|For LT-22222-LA: ON when DO1 is low, OFF when DO1 is high
--|**DO2**|For LT-22222-LA: ON when DO2 is low, OFF when DO2 is high
++|**DO1**|For LT-22222-L: ON when DO1 is low, OFF when DO1 is high
++|**DO2**|For LT-22222-L: ON when DO2 is low, OFF when DO2 is high
  |**DI1**|(((
--For LT-22222-LA: ON when DI1 is high, OFF when DI1 is low
++For LT-22222-L: ON when DI1 is high, OFF when DI1 is low
  )))
  |**DI2**|(((
--For LT-22222-LA: ON when DI2 is high, OFF when DI2 is low
++For LT-22222-L: ON when DI2 is high, OFF when DI2 is low
  )))
--|**RO1**|For LT-22222-LA: ON when RO1 is closed, OFF when RO1 is open
--|**RO2**|For LT-22222-LA: ON when RO2 is closed, OFF when RO2 is open
++|**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 Commands =
--The LT-22222-LA supports programming using AT Commands.
++The LT-22222-L supports programming using AT Commands.
--== 4.1 Connecting the LT-22222-LA to a PC ==
++== 4.1 Connecting the LT-22222-L to a PC ==
  (((
--You can use a USB-to-TTL adapter/converter along with a 3.5mm Program Cable to connect the LT-22222-LA to a PC, as shown below.
++You can use a USB-to-TTL adapter/converter along with a 3.5mm Program Cable to connect the LT-22222-L to a PC, as shown below.
--(% title="Click and drag to resize" %)
++[[image:usb-ttl-audio-jack-connection.jpg]]
  )))
@@ -2418,6 +2418,7 @@
  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]]
  (((
@@ -2599,7 +2599,7 @@
  )))
  (((
--
++[[image:1653359097980-169.png||height="188" width="729"]]
  )))
@@ -2651,6 +2651,7 @@
  Below is the hardware setup for uploading a firmware image to the LT-22222-L:
++[[image:usb-ttl-audio-jack-connection.jpg]]
@@ -2666,14 +2666,18 @@
  )))
++  [[image:image-20220524103407-12.png]]
++[[image:image-20220524103429-13.png]]
++[[image:image-20220524104033-15.png]]
  (% style="color:red" %)**Note**(%%): If you have lost the programming cable, you can make one from a 3.5 mm cable. The pin mapping is as follows:
++[[image:1653360054704-518.png||height="186" width="745"]]
  (((
@@ -2713,7 +2713,7 @@
  (((
  (% style="color:#0000ff" %)**Step 1**(%%):  Log in to The Things Stack Sandbox account and create an ABP device in the application. To do this, use the manual registration option as explained in section 3.2.2.2, //Adding a Device Manually//. Select //Activation by Personalization (ABP)// under Activation Mode. Enter the DevEUI exactly as shown on the registration information sticker, then generate the Device Address, Application Session Key (AppSKey), and Network Session Key (NwkSKey).
--
++[[image:lt-22222-l-abp.png||height="686" width="1000"]]
  )))
  (((
@@ -2762,6 +2762,7 @@
  (% style="color:#000000; font-family:Arial,sans-serif; font-size:11pt; font-style:normal; font-variant-alternates:normal; font-variant-east-asian:normal; font-variant-ligatures:normal; font-variant-numeric:normal; font-variant-position:normal; font-weight:400; text-decoration:none; white-space:pre-wrap" %)The following figure shows the screenshot of the command set above, issued using a serial tool:
  )))
++[[image:1653360498588-932.png||height="485" width="726"]]
  == 6.4 How to change the uplink interval? ==
@@ -2800,6 +2800,7 @@
  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:
++[[image:image-20221006170630-1.png||height="610" width="945"]]
  == 6.9 Can the LT-22222-L save the RO state? ==

1653358355238-883.png

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