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510	510	== 3.5 Configure RS485-BL via AT or Downlink ==
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512	512	User can configure RS485-LN via AT Commands or LoRaWAN Downlink Commands
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514	514	There are two kinds of Commands:
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515	515
516		-* (% style="color:#4f81bd" %)**Common Commands**(%%): They should be available for each sensor, such as: change uplink interval, reset device. For firmware v1.3, user can find what common commands it supports: [[AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
	520	+* (((
	521	+(% style="color:#4f81bd" %)**Common Commands**(%%): They should be available for each sensor, such as: change uplink interval, reset device. For firmware v1.3, user can find what common commands it supports: [[AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
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518		-* (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for RS485-LN.  User can see these commands below:
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	525	+(% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for RS485-LN.  User can see these commands below:
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	532	+
520	520	=== 3.5.1 Common Commands ===
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522	522	They should be available for each of Dragino Sensors, such as: change uplink interval, reset device. For firmware v1.3, user can find what common commands it supports: [[End Device AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
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538	538	==== **RS485 Debug Command** ====
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540	540	This command is used to configure the RS485 devices; they won’t be used during sampling.
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541	541
542		-* **AT Command**
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	558	+**AT Command**
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544	544	(% class="box infomessage" %)
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546	546	**AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m**
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549	549	m: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
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550	550
551		-* **Downlink Payload**
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	573	+**Downlink Payload**
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553	553	Format: A8 MM NN XX XX XX XX YY
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555	555	Where:
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557		-* MM: 1: add CRC-16/MODBUS ; 0: no CRC
558		-* NN: The length of RS485 command
559		-* XX XX XX XX: RS485 command total NN bytes
560		-* YY: How many bytes will be uplink from the return of this RS485 command,
561		-** if YY=0, RS485-LN will execute the downlink command without uplink;
562		-** if YY>0, RS485-LN will uplink total YY bytes from the output of this RS485 command; Fport=200
563		-** if YY=FF, RS485-LN will uplink RS485 output with the downlink command content; Fport=200.
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	585	+MM: 1: add CRC-16/MODBUS ; 0: no CRC
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	587	+* (((
	588	+NN: The length of RS485 command
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	590	+* (((
	591	+XX XX XX XX: RS485 command total NN bytes
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	593	+* (((
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	595	+YY: How many bytes will be uplink from the return of this RS485 command,
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	598	+* (((
	599	+if YY=0, RS485-LN will execute the downlink command without uplink;
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	601	+* (((
	602	+if YY>0, RS485-LN will uplink total YY bytes from the output of this RS485 command; Fport=200
	603	+)))
	604	+* (((
	605	+if YY=FF, RS485-LN will uplink RS485 output with the downlink command content; Fport=200.
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565	565	**Example 1** ~-~-> Configure without ask for uplink (YY=0)
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567	567	To connect a Modbus Alarm with below commands.
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569		-* The command to active alarm is: 0A 05 00 04 00 01 4C B0. Where 0A 05 00 04 00 01 is the Modbus command to read the register 00 40 where stored the DI status. The 4C B0 is the CRC-16/MODBUS which calculate manually.
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	618	+The command to active alarm is: 0A 05 00 04 00 01 4C B0. Where 0A 05 00 04 00 01 is the Modbus command to read the register 00 40 where stored the DI status. The 4C B0 is the CRC-16/MODBUS which calculate manually.
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570	570
571		-* The command to deactivate alarm is: 0A 05 00 04 00 00 8D 70. Where 0A 05 00 04 00 00 is the Modbus command to read the register 00 40 where stored the DI status. The 8D 70 is the CRC-16/MODBUS which calculate manually.
	621	+* (((
	622	+The command to deactivate alarm is: 0A 05 00 04 00 00 8D 70. Where 0A 05 00 04 00 00 is the Modbus command to read the register 00 40 where stored the DI status. The 8D 70 is the CRC-16/MODBUS which calculate manually.
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573	573	So if user want to use downlink command to control to RS485 Alarm, he can use:
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575	575	(% style="color:#4f81bd" %)**A8 01 06 0A 05 00 04 00 01 00**(%%): to activate the RS485 Alarm
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577	577	(% style="color:#4f81bd" %)**A8 01 06 0A 05 00 04 00 00 00**(%%): to deactivate the RS485 Alarm
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579	579	A8 is type code and 01 means add CRC-16/MODBUS at the end, the 3^^rd^^ byte is 06, means the next 6 bytes are the command to be sent to the RS485 network, the final byte 00 means this command don’t need to acquire output.
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582	582	**Example 2** ~-~-> Configure with requesting uplink and original downlink command (**YY=FF**)
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584	584	User in IoT server send a downlink command: (% style="color:#4f81bd" %)**A8 01 06 0A 08 00 04 00 01 YY**
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587	587	RS485-LN got this downlink command and send (% style="color:#4f81bd" %)**0A 08 00 04 00 01 **(%%)to Modbus network. One of the RS485 sensor in the network send back Modbus reply **0A 08 00 04 00 00**. RS485-LN get this reply and combine with the original downlink command and uplink. The uplink message is:
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589	589	**A8** (% style="color:#4f81bd" %)**0A 08 00 04 00  **(% style="color:red" %)**01 06** ** **(% style="color:green" %)**0A 08 00 04 00 00**
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591	591	[[image:1654159460680-153.png]]
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