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1		-(% class="wikigeneratedid" %)
2		- **Contents:**
3		-
4		-{{toc/}}
5		-
6	6	= 1. Introduction =
7	7
8	8	This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
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15	15
16	16	Connection
17	17
18		-
19	19	[[image:https://wiki.dragino.com/images/thumb/f/f2/RS485_02.png/600px-RS485_02.png||height="743" width="528"]](% style="display:none" %)
20	20
21	21	Connection
...	...	@@ -34,7 +34,6 @@
34	34
35	35	Connection
36	36
37		-
38	38	[[image:https://wiki.dragino.com/images/thumb/5/5f/RS485_02_2.png/600px-RS485_02_2.png||height="337" width="600"]]
39	39
40	40	Connection
...	...	@@ -58,29 +58,17 @@
58	58
59	59	Connection1
60	60
61		-(((
62	62	How to connect with Energy Meter：
63		-)))
64	64
65		-(((
66	66	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		-)))
68	68
69		-(((
70	70	The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
71		-)))
72	72
73		-(((
74	74	Power Source VIN to RS485-LN VIN+
75		-)))
76	76
77		-(((
78	78	Power Source GND to RS485-LN VIN-
79		-)))
80	80
81		-(((
82	82	Once there is power, the RS485-LN will be on.
83		-)))
84	84
85	85	[[image:https://wiki.dragino.com/images/thumb/1/15/Meter2.jpg/600px-Meter2.jpg||height="433" width="577"]]
86	86
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87	87	Connection2
88	88
89	89
90		-[[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="712" width="534"]]
	71	+[[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="763" width="573"]]
91	91
92	92	Connection3
93	93
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143	143
144	144	(% class="box infomessage" %)
145	145	(((
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
	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
147	147	)))
148	148
149	149	a: length for the return of AT+COMMAND
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230	230
231	231	==== 1.3.3.2 via LoRaWAN DOWNLINK ====
232	232
233		-[[image:image-20220512104358-3.png]]
	214	+[[image:https://wiki.dragino.com/images/thumb/f/fc/DOWNLINK_METER1.png/600px-DOWNLINK_METER1.png||height="423" width="600"]]
234	234
235	235	(((
236	236	DOWNLINK
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241	241	)))
242	242
243	243	(((
244		-**Type Code 0xAF**
	225	+Type Code 0xAF
245	245	)))
246	246
247	247	(((
248		-(% class="box infomessage" %)
249		-(((
250	250	0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
251	251	)))
252		-)))
253	253
254	254	(((
255	255	Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
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314	314
315	315	DOWNLINK
316	316
317		-
318	318	[[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
319	319
320	320	DOWNLINK
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342	342	check digit: Even
343	343	)))
344	344
345		-[[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="725" width="544"]]
	322	+[[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="800" width="600"]]
346	346
347	347	USB
348	348
349	349
350		-[[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="728" width="546"]]
	327	+[[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="800" width="600"]]
351	351
352	352	USB
353	353
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361	361	)))
362	362
363	363	(((
364		- output：01 03 04 00 00 00 42 7A 02
	341	+ output:01 03 04 00 00 00 42 7A 02
365	365	)))
366	366
367	367	[[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
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372	372
373	373	If users need to read the parameters of multiple energy meters, they need to modify the device address, because the default device address of each energy meter is 01.
374	374
375		-(((
376		-(((
377	377	Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
378		-)))
379		-)))
380	380
381	381	[[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
382	382
383		-**Example**:These two meters are examples of setting parameters and device addresses.
	356	+Example:These two meters are examples of setting parameters and device addresses.
384	384
385		-[[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="737" width="553"]]
	358	+[[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="800" width="600"]]
386	386
387		-[[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="733" width="550"]]
	360	+[[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="800" width="600"]]
388	388
389		-(((
390		-(((
391	391	First of all, since the default device address of the energy meter is 01, the configuration of two energy meters will conflict, so we first connect an energy meter and configure the device address.
392		-)))
393		-)))
394	394
395		-(((
396		-(((
397	397	We can use AT+CFGDEV to set the device address.
398		-)))
399		-)))
400	400
401		-(((
402		-(((
403	403	We modify the device address 01 of the first energy meter to 02.
404		-)))
405		-)))
406	406
407	407	[[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
408	408

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