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562	562	It shows how to use RS485-LN to connect to an ultrasonic flow meter and read the data from the ultrasonic flow meter.
563	563
564	564
	565	+Need to prepare RS485-LN, recharger, Electric wire
565	565
566		-* **Specific steps**:  RS485-LN with ultrasonic flow meter
567		-*
	567	+[[image:1720669739434-926.png]] [[image:1720669744315-613.png]]
	568	+
	569	+
	570	+=== 1.9.1 Setting Ultrasonic Flowmeter ===
	571	+
	572	+
	573	+Adjust the M option corresponding to the ultrasonic flowmeter as follows
	574	+
	575	+M52 sets RS485 Port.
	576	+
	577	+[[image:1720669933691-331.png]]
	578	+
	579	+
	580	+M62 sets 9600, none, 1
	581	+
	582	+[[image:1720669981767-254.png]]
	583	+
	584	+
	585	+M63 sets automatic
	586	+
	587	+[[image:1720670003601-544.png]]
	588	+
	589	+
	590	+=== 1.9.2 Setting Dragino RS485-LN ===
	591	+
	592	+
	593	+The RS485-LN wiring port is as shown below. Connect the power supply and RS485 A/B line according to the diagram.
	594	+
	595	+[[image:1720670016539-422.png]][[image:1720670019136-658.png]]
	596	+
	597	+
	598	+=== 1.9.3 Connect the RS485-LN to Ultrasonic Flowmeter ===
	599	+
	600	+
	601	+According to the instructions of the ultrasonic flow meter, 26 and 27 are the + and - of RS485, corresponding to the A and B ports of RS485.
	602	+
	603	+[[image:1720670035661-234.png]][[image:1720670041974-372.png||height="417" width="436"]]
	604	+
	605	+
	606	+=== 1.9.4 Full wiring example ===
	607	+
	608	+
	609	+The yellow wire connects port 26 and port A of RS485-LN.
	610	+
	611	+The green wire connects port 27 and port B of RS485-LN.
	612	+
	613	+[[image:1720670079781-764.png]]
	614	+
	615	+
	616	+=== 1.9.5 How to read ultrasonic flow meter data via RS485 ===
	617	+
	618	+
	619	+[[image:1720670090204-634.png]]
	620	+
	621	+
	622	+For example, I want to read Positive
	623	+
	624	+Through M02, we can see that the POS data is 54.9862
	625	+
	626	+[[image:1720670103571-173.png]][[image:1720670108127-723.png||height="597" width="645"]]
	627	+
	628	+Registers are 9-12, so the read command is AT+CFGDEV=01 03 00 08 00 04,1(,1 is used for automatic complement)
	629	+
	630	+[[image:1720670123955-149.png]]
	631	+
	632	+AT+CFGDEV=01 03 00 08 00 04 c5 cb ,1
	633	+
	634	+RETURN DATA:
	635	+
	636	+01 03 08 00 36 00 00 78 79 3f 7c 1a bc
	637	+
	638	+
	639	+OK
	640	+
	641	+
	642	+00 36 00 00 is the integer of the read value
	643	+
	644	+78 79 3f 7c is a decimal, but it needs to be converted and parsed into floating point. The parsing order is CDAB, which is 3f 7c 78 79
	645	+
	646	+Conversion and parsing website:http:~/~/www.speedfly.cn/tools/hexconvert/
	647	+
	648	+[[image:1720670134750-980.png]]
	649	+
	650	+

1720670134750-980.png

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