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510	510	== 3.5 Configure RS485-BL via AT or Downlink ==
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	512	+(((
512	512	User can configure RS485-LN via AT Commands or LoRaWAN Downlink Commands
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513	513
	516	+(((
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]]
	522	+)))
517	517
518		-* (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for RS485-LN.  User can see these commands below:
	524	+* (((
	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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519	519
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	529	+
	530	+)))
	531	+
	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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	551	+
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**
	558	+* (((
	559	+**AT Command**
	560	+)))
543	543
544	544	(% class="box infomessage" %)
545	545	(((
	564	+(((
546	546	**AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m**
547	547	)))
	567	+)))
548	548
	569	+(((
549	549	m: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
	571	+)))
550	550
551		-* **Downlink Payload**
	573	+* (((
	574	+**Downlink Payload**
	575	+)))
552	552
	577	+(((
553	553	Format: A8 MM NN XX XX XX XX YY
	579	+)))
554	554
	581	+(((
555	555	Where:
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556	556
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.
	585	+* (((
	586	+MM: 1: add CRC-16/MODBUS ; 0: no CRC
	587	+)))
	588	+* (((
	589	+NN: The length of RS485 command
	590	+)))
	591	+* (((
	592	+XX XX XX XX: RS485 command total NN bytes
	593	+)))
	594	+* (((
	595	+(((
	596	+YY: How many bytes will be uplink from the return of this RS485 command,
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	599	+* (((
	600	+if YY=0, RS485-LN will execute the downlink command without uplink;
	601	+)))
	602	+* (((
	603	+if YY>0, RS485-LN will uplink total YY bytes from the output of this RS485 command; Fport=200
	604	+)))
	605	+* (((
	606	+if YY=FF, RS485-LN will uplink RS485 output with the downlink command content; Fport=200.
	607	+)))
	608	+)))
	609	+
	610	+(((
565	565	**Example 1** ~-~-> Configure without ask for uplink (YY=0)
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566	566
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567	567	To connect a Modbus Alarm with below commands.
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568	568
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.
	618	+* (((
	619	+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.
	620	+)))
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.
	622	+* (((
	623	+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.
	624	+)))
572	572
	626	+(((
573	573	So if user want to use downlink command to control to RS485 Alarm, he can use:
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574	574
	630	+(((
575	575	(% style="color:#4f81bd" %)**A8 01 06 0A 05 00 04 00 01 00**(%%): to activate the RS485 Alarm
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	634	+(((
577	577	(% style="color:#4f81bd" %)**A8 01 06 0A 05 00 04 00 00 00**(%%): to deactivate the RS485 Alarm
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578	578
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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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	642	+(((
	643	+
	644	+)))
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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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	654	+(((
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	656	+)))
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	658	+(((
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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593	593
594	594
595	595	==== **Set Payload version** ====
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597	597	This is the first byte of the uplink payload. RS485-BL can connect to different sensors. User can set the PAYVER field to tell server how to decode the current payload.
	676	+)))
598	598
599		-* **AT Command:**
	678	+* (((
	679	+**AT Command:**
	680	+)))
600	600
601	601	(% class="box infomessage" %)
602	602	(((
	684	+(((
603	603	**AT+PAYVER: Set PAYVER field = 1**
604	604	)))
	687	+)))
605	605
606		-* **Downlink Payload:**
	689	+* (((
	690	+**Downlink Payload:**
	691	+)))
607	607
	693	+(((
608	608	**0xAE 01**  ~-~-> Set PAYVER field =  0x01
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	697	+(((
610	610	**0xAE 0F**   ~-~-> Set PAYVER field =  0x0F
	699	+)))
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612	612
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	703	+
614	614	==== **Set RS485 Sampling Commands** ====
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616	616	AT+COMMANDx or AT+DATACUTx