Version 7.1 by Xiaoling on 2022/05/27 09:18
Show last authors
1 (% class="wikigeneratedid" %)
2 **Contents:**
3
4 {{toc/}}
5
6 = 1. Introduction =
7
8 This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
9
10 == 1.1 Example 1: Connect to Leak relay and VFD ==
11
12 This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to Relay and VFD and communicate with Mobile. The structure is like below:
13
14 [[image:https://wiki.dragino.com/images/thumb/5/5c/RS485_01.png/600px-RS485_01.png||height="297" width="534"]]
15
16 Connection
17
18
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
21 Connection
22
23 Related documents:
24
25 * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
26 * [[Configure Manual>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : Explanation on how to integrate to Node-red and to the Mobile Phone, and with link to the Github code.
27 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
28
29 == 1.2 Example 2: Connect to Pulse Counter ==
30
31 This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to Pulse Counter and communicate with Mobile. This example and example 2 compose the structure for a farm IoT solution. The structure is like below:
32
33 [[image:https://wiki.dragino.com/images/thumb/3/34/RS485_02_1.png/600px-RS485_02_1.png||height="364" width="600"]]
34
35 Connection
36
37
38 [[image:https://wiki.dragino.com/images/thumb/5/5f/RS485_02_2.png/600px-RS485_02_2.png||height="337" width="600"]]
39
40 Connection
41
42 * [[Pickdata MIO40 water pulse counter to LoRa with Dragino RS485-LN>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Pulse-Counter/]] : Configure Document
43 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
44
45 == 1.3 Example3: Use RS485-LN with energy meters ==
46
47 === 1.3.1 OverView ===
48
49 (((
50 **Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
51 )))
52
53 (((
54 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
55 )))
56
57 [[image:https://wiki.dragino.com/images/thumb/f/f4/Meter1.jpg/600px-Meter1.jpg||height="726" width="545"]]
58
59 Connection1
60
61 (((
62 How to connect with Energy Meter：
63 )))
64
65 (((
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
69 (((
70 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
71 )))
72
73 (((
74 Power Source VIN to RS485-LN VIN+
75 )))
76
77 (((
78 Power Source GND to RS485-LN VIN-
79 )))
80
81 (((
82 Once there is power, the RS485-LN will be on.
83 )))
84
85 [[image:https://wiki.dragino.com/images/thumb/1/15/Meter2.jpg/600px-Meter2.jpg||height="433" width="577"]]
86
87 Connection2
88
89
90 [[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="712" width="534"]]
91
92 Connection3
93
94
95 === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
96
97 If the user needs to read the parameters of the electric energy meter and use the modbus command,please refer to the appendix of the MODBUS communication protocol in the user manual of the energy meter.
98
99 [[image:https://wiki.dragino.com/images/thumb/3/35/Meter4.png/600px-Meter4.png||alt="Meter4.png" height="193" width="600"]]
100
101 (% class="box infomessage" %)
102 (((
103 Example:AT+COMMAND1=01 03 00 00 00 01 84 0A
104 )))
105
106 * The first byte : slave address code (=001～247)
107 * The second byte : read register value function code
108 * 3rd and 4th bytes: start address of register to be read
109 * 5th and 6th bytes: Number of registers to read
110 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
111
112 (((
113 How to parse the reading of the return command of the parameter：
114 )))
115
116 (% class="box infomessage" %)
117 (((
118 Example:RETURN1：01 03 02 08 FD 7E 05
119 )))
120
121 * The first byte ARD: slave address code (=001～254)
122 * The second byte: Return to read function code
123 * 3rd byte: total number of bytes
124 * 4th～5th bytes: register data
125 * The 6th and 7th bytes: CRC16 checksum
126 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
127
128 === 1.3.3 How to configure RS485-LN and parse output commands ===
129
130 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
131
132 ==== 1.3.3.1 via AT COMMAND: ====
133
134 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
135
136 (((
137 If the configured parameters and commands are incorrect, the return value is not obtained.
138 )))
139
140 [[image:https://wiki.dragino.com/images/b/bc/AT_COMMAND1.png||height="358" width="456"]]
141
142 AT COMMAND
143
144 (% class="box infomessage" %)
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
147 )))
148
149 a: length for the return of AT+COMMAND
150
151 b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
152
153 c: define the position for valid value.
154
155 [[image:https://wiki.dragino.com/images/7/7d/AT_COMMAND2.png||height="278" width="477"]]
156
157 AT COMMAND
158
159 PAYLOAD is available after the valid value is intercepted.
160
161
162 [[image:https://wiki.dragino.com/images/3/3a/AT_COMMAND4.png||height="219" width="576"]]
163
164 AT COMMAND
165
166 You can get configured PAYLOAD on TTN.
167
168
169 [[image:https://wiki.dragino.com/images/thumb/c/c2/AT_COMMAND3.png/600px-AT_COMMAND3.png||height="138" width="600"]]
170
171 (((
172 AT COMMAND
173 )))
174
175 (((
176
177 )))
178
179 (((
180 **Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
181 )))
182
183 (((
184 RETURN1:01 03 02 00 02 39 85 00 00(return data)
185 )))
186
187 (((
188 AT+DATACUT1:9,1,4+5+6+7 Take the return value 00 02 39 85 as the valid value of reading current data and used to splice payload.
189 )))
190
191 (((
192 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
193 )))
194
195 (((
196 RETURN2:01 03 02 08 DC BE 1D(return data)
197 )))
198
199 (((
200 AT+DATACUT2:7,1,4+5 Take the return value 08 DC as the valid value of reading voltage data and used to splice payload.
201 )))
202
203 (((
204 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
205 )))
206
207 (((
208 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
209 )))
210
211 (((
212 AT+DATACUT3:9,1,4+5+6+7 Take the return value 00 00 00 44 as the valid value of reading total active energy data and used to splice payload.
213 )))
214
215 (((
216 Payload:01 00 02 39 85 08 DC 00 00 00 44
217 )))
218
219 [[image:https://wiki.dragino.com/images/thumb/9/9b/AT_COMMAND10.png/600px-AT_COMMAND10.png||height="278" width="600"]]
220
221 AT COMMAND
222
223 01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.
224
225
226 [[~[~[image:https://wiki.dragino.com/images/thumb/b/b8/AT_COMMAND11.png/600px-AT_COMMAND11.png~|~|height="271" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:AT_COMMAND11.png]]
227
228 AT COMMAND
229
230
231 ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
232
233 [[image:image-20220512104358-3.png]]
234
235 (((
236 DOWNLINK
237 )))
238
239 (((
240
241 )))
242
243 (((
244 **Type Code 0xAF**
245 )))
246
247 (((
248 (% class="box infomessage" %)
249 (((
250 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
251 )))
252 )))
253
254 (((
255 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
256 )))
257
258 (((
259 Format: AF MM NN LL XX XX XX XX YY
260 )))
261
262 (((
263 Where:
264 )))
265
266 (((
267 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
268 )))
269
270 (((
271 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
272 )))
273
274 (((
275 LL: The length of AT+COMMAND or AT+DATACUT command
276 )))
277
278 (((
279 XX XX XX XX: AT+COMMAND or AT+DATACUT command
280 )))
281
282 (((
283 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
284 )))
285
286 (((
287 will execute an uplink after got this command.
288 )))
289
290 (((
291 Example:
292 )))
293
294 (((
295 AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
296 )))
297
298 [[image:https://wiki.dragino.com/images/thumb/4/45/DOWNLINK_METER2.png/600px-DOWNLINK_METER2.png||height="208" width="600"]]
299
300 DOWNLINK
301
302
303 [[~[~[image:https://wiki.dragino.com/images/thumb/2/20/DOWNLINK_METER3.png/600px-DOWNLINK_METER3.png~|~|height="105" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:DOWNLINK_METER3.png]]
304
305 DOWNLINK
306
307
308 [[image:https://wiki.dragino.com/images/thumb/2/27/DOWNLINK_METER4.png/600px-DOWNLINK_METER4.png||height="210" width="600"]]
309
310 DOWNLINK
311
312
313 [[~[~[image:https://wiki.dragino.com/images/thumb/3/39/DOWNLINK_METER5.png/600px-DOWNLINK_METER5.png~|~|height="176" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:DOWNLINK_METER5.png]]
314
315 DOWNLINK
316
317
318 [[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
319
320 DOWNLINK
321
322
323 === 1.3.4 How to configure and output commands for RS485 to USB ===
324
325 (((
326 This step is not necessary, it is just to show how to use a normal RS485 to USB adapter to connect to the meter to check the input and output. This can be used to test the connection and RS485 command of the meter without RS485-LN.
327 )))
328
329 (((
330 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
331 )))
332
333 (((
334 Open the serial port debugging, set the send and receive to HEX.
335 )))
336
337 (((
338 Baud rate: 9600
339 )))
340
341 (((
342 check digit: Even
343 )))
344
345 [[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="725" width="544"]]
346
347 USB
348
349
350 [[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="728" width="546"]]
351
352 USB
353
354
355 (((
356 The configuration command is consistent with the AT command, input the hexadecimal command directly into the serial port, and the serial port will output the command.
357 )))
358
359 (((
360 **Example:**  input：01 03 00 31 00 02 95 c4
361 )))
362
363 (((
364 output：01 03 04 00 00 00 42 7A 02
365 )))
366
367 [[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
368
369 USB
370
371 === 1.3.5 How to configure multiple devices and modify device addresses ===
372
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
375 (((
376 (((
377 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
378 )))
379 )))
380
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
383 **Example**:These two meters are examples of setting parameters and device addresses.
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"]]
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"]]
388
389 (((
390 (((
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
395 (((
396 (((
397 We can use AT+CFGDEV to set the device address.
398 )))
399 )))
400
401 (((
402 (((
403 We modify the device address 01 of the first energy meter to 02.
404 )))
405 )))
406
407 [[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
408
409 AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
410
411 * 01:device adaress
412
413 * 10:function code
414
415 * 00 61：Register address
416
417 * 00 01：Number of Registers
418
419 * 02：Number of bytes
420
421 * 00 02：Modified device address
422
423 * 1：Check code
424
425 The device address setting of the energy meter is complete.
426
427 Another energy meter is a single active energy meter with a floating-point format.
428
429 Its default device address is 01, and the following are the parameters for configuring two energy meters.
430
431 [[image:https://wiki.dragino.com/images/1/13/Meter11.png||alt="Meter11.png" height="576" width="379"]]
432
433 [[image:https://wiki.dragino.com/images/thumb/7/7e/Meter12.png/600px-Meter12.png||alt="Meter12.png" height="262" width="600"]]
434
435 PAYLOAD:01 08 DF 43 62
436
437 * 08 DF is the valid value of the meter with device address 02.
438 * 43 62 is the valid value of the meter with device address 01.
439
440 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
441
442 This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to SCHNEIDER SMART and Monitor and control your cabinet remotely with no wires and with Dragino RS485-LN LoRaWAN technology. The structure is like below:
443
444 [[image:https://wiki.dragino.com/images/thumb/f/fa/RS485_04_2.png/600px-RS485_04_2.png||height="336" width="600"]]
445
446 Connection
447
448 * [[Circuit Breaker Remote Open Close>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Circuit_Breaker_Remote_Open_Close/]] : Configure Documen
449
450 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
451
452 This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-BL to connect to SEM Three Energy Meter and send the data to mobile phone for remote minitor. The structure is like below:
453
454 * [[Connect to SEM Three>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/RS485-BL/Application_Note/&file=Dragino%20RS485BL%20and%20pickdata%20SEM%20Three%20v1.pdf]] : Configure Document For RS485-BL
455
456 * [[Connect to SEM Three>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/SEM_Three_Energy_Meter/&file=SEM%20three%20and%20Dragino%20RS485-LN%20v1.pdf]] : Configure Document for RS485-LN
457
458 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
459
460 This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to CEM C31 485-T1-MID and send the data for remote minitor. The structure is like below:
461
462 * [[CEM C31 485-T1-MID>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/ELECTRICAL%20CABINET/&file=ELECTRICAL%20CABINET%20READINGS.pdf]] : Configure Document For RS485-LN
463
464 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
465
466 [[image:https://wiki.dragino.com/images/thumb/9/97/PLC_M221.png/600px-PLC_M221.png||height="353" width="600"]]
467
468 Network Structure
469
470 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]

Applications

Navigation

Copyright ©2010-2022 Dragino Technology Co., LTD. All rights reserved
Dragino Wiki v2.0