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	2	+ **Contents:**
	3	+
	4	+{{toc/}}
	5	+
1	1	= 1. Introduction =
2	2
3	3	This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
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10	10
11	11	Connection
12	12
	18	+
13	13	[[image:https://wiki.dragino.com/images/thumb/f/f2/RS485_02.png/600px-RS485_02.png||height="743" width="528"]](% style="display:none" %)
14	14
15	15	Connection
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28	28
29	29	Connection
30	30
	37	+
31	31	[[image:https://wiki.dragino.com/images/thumb/5/5f/RS485_02_2.png/600px-RS485_02_2.png||height="337" width="600"]]
32	32
33	33	Connection
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51	51
52	52	Connection1
53	53
	61	+(((
54	54	How to connect with Energy Meter：
	63	+)))
55	55
	65	+(((
56	56	Follow the instructions of the electric energy meter to connect the phase line and the neutral line, and then connect 485A+ and 485B- to RS485A and RA485B of RS485-LN respectively.
	67	+)))
57	57
	69	+(((
58	58	The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
	71	+)))
59	59
	73	+(((
60	60	Power Source VIN to RS485-LN VIN+
	75	+)))
61	61
	77	+(((
62	62	Power Source GND to RS485-LN VIN-
	79	+)))
63	63
	81	+(((
64	64	Once there is power, the RS485-LN will be on.
	83	+)))
65	65
66	66	[[image:https://wiki.dragino.com/images/thumb/1/15/Meter2.jpg/600px-Meter2.jpg||height="433" width="577"]]
67	67
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124	124
125	125	(% class="box infomessage" %)
126	126	(((
127		-AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
	146	+ AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
128	128	)))
129	129
130	130	a: length for the return of AT+COMMAND
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211	211
212	212	==== 1.3.3.2 via LoRaWAN DOWNLINK ====
213	213
214		-[[image:https://wiki.dragino.com/images/thumb/f/fc/DOWNLINK_METER1.png/600px-DOWNLINK_METER1.png||height="423" width="600"]]
	233	+[[image:image-20220512104358-3.png]]
215	215
216	216	(((
217	217	DOWNLINK
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222	222	)))
223	223
224	224	(((
225		-Type Code 0xAF
	244	+**Type Code 0xAF**
226	226	)))
227	227
228	228	(((
	248	+(% class="box infomessage" %)
	249	+(((
229	229	0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
230	230	)))
	252	+)))
231	231
232	232	(((
233	233	Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
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339	339	)))
340	340
341	341	(((
342		- output:01 03 04 00 00 00 42 7A 02
	364	+ output：01 03 04 00 00 00 42 7A 02
343	343	)))
344	344
345	345	[[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]

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