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795	795
796	796	==== **Fast command to handle MODBUS device** ====
797	797
	798	+(((
798	798	AT+MBFUN is valid since v1.3 firmware version. The command is for fast configure to read Modbus devices. It is only valid for the devices which follow the [[MODBUS-RTU protocol>>url:https://www.modbustools.com/modbus.html]].
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799	799
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800	800	This command is valid since v1.3 firmware version
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801	801
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802	802	AT+MBFUN can auto read the Modbus function code: 01, 02, 03 or 04. AT+MBFUN has lower priority vs AT+DATACUT command. If AT+DATACUT command is configured, AT+MBFUN will be ignore.
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803	803
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804	804
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805	805	**Example:**
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806	806
807		-* AT+MBFUN=1 and AT+DATACUT1/AT+DATACUT2 are not configure (0,0,0). So RS485-LN.
808		-* AT+COMMAND1= 01 03 00 10 00 08,1 ~-~-> read slave address 01 , function code 03, start address 00 01, quantity of registers 00 08.
809		-* AT+COMMAND2= 01 02 00 40 00 10,1 ~-~-> read slave address 01 , function code 02, start address 00 40, quantity of inputs 00 10.
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	819	+AT+MBFUN=1 and AT+DATACUT1/AT+DATACUT2 are not configure (0,0,0). So RS485-LN.
	820	+)))
	821	+* (((
	822	+AT+COMMAND1= 01 03 00 10 00 08,1 ~-~-> read slave address 01 , function code 03, start address 00 01, quantity of registers 00 08.
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	824	+* (((
	825	+AT+COMMAND2= 01 02 00 40 00 10,1 ~-~-> read slave address 01 , function code 02, start address 00 40, quantity of inputs 00 10.
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810	810
811	811	[[image:image-20220602165351-6.png]]
812	812
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814	814
815	815
816	816
	834	+
817	817	==== **RS485 command timeout** ====
818	818
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819	819	Some Modbus device has slow action to send replies. This command is used to configure the RS485-LN to use longer time to wait for their action.
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820	820
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821	821	Default value: 0, range:  0 ~~ 65 seconds
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822	822
823		-* **AT Command:**
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	846	+**AT Command:**
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824	824
825	825	(% class="box infomessage" %)
826	826	(((
	851	+(((
827	827	**AT+CMDDLaa=hex(bb cc)*1000**
828	828	)))
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829	829
	856	+(((
830	830	**Example:**
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831	831
	860	+(((
832	832	**AT+CMDDL1=1000** to send the open time to 1000ms
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833	833
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834	834
835		-* **Downlink Payload:**
	868	+* (((
	869	+**Downlink Payload:**
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836	836
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837	837	**0x AA aa bb cc**
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838	838
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839	839	Same as: AT+CMDDLaa=hex(bb cc)*1000
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840	840
	880	+(((
841	841	**Example:**
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842	842
	884	+(((
843	843	0xAA 01 00 01  ~-~-> Same as **AT+CMDDL1=1000 ms**
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844	844
845	845
846	846
	890	+
847	847	==== **Uplink payload mode** ====
848	848
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849	849	Define to use one uplink or multiple uplinks for the sampling.
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850	850
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851	851	The use of this command please see: [[Compose Uplink payload>>||anchor="H3.3.4Composetheuplinkpayload"]]
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852	852
853		-* **AT Command:**
	901	+* (((
	902	+**AT Command:**
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854	854
855	855	(% class="box infomessage" %)
856	856	(((
	907	+(((
857	857	**AT+DATAUP=0**
858	858	)))
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859	859
860	860	(% class="box infomessage" %)
861	861	(((
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862	862	**AT+DATAUP=1**
863	863	)))
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864	864
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865	865
866		-* **Downlink Payload:**
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	924	+**Downlink Payload:**
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867	867
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868	868	**0xAD 00**  **~-~->** Same as AT+DATAUP=0
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869	869
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870	870	**0xAD 01**  **~-~->** Same as AT+DATAUP=1
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871	871
872	872
873	873
	937	+
874	874	==== **Manually trigger an Uplink** ====
875	875
876	876	Ask device to send an uplink immediately.
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886	886
887	887
888	888
	953	+
889	889	==== **Clear RS485 Command** ====
890	890
	956	+(((
891	891	The AT+COMMANDx and AT+DATACUTx settings are stored in special location, user can use below command to clear them.
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892	892
893		-* **AT Command:**
	960	+* (((
	961	+**AT Command:**
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894	894
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895	895	**AT+CMDEAR=mm,nn**   mm: start position of erase ,nn: stop position of erase
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896	896
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897	897	Etc. AT+CMDEAR=1,10 means erase AT+COMMAND1/AT+DATACUT1 to AT+COMMAND10/AT+DATACUT10
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898	898
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899	899	Example screen shot after clear all RS485 commands.
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900	900
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901	901
	980	+(((
902	902	The uplink screen shot is:
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903	903
904	904	[[image:1654160691922-496.png]]
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911	911
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	993	+
913	913	==== **Set Serial Communication Parameters** ====
914	914
915	915	Set the Rs485 serial communication parameters: