Version 15.1 by Xiaoling on 2022/05/27 09:27
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:image-20220527091852-1.png]]
15
16 Connection
17
18
19
20 [[image:image-20220527091942-2.png]](% style="display:none" %)
21
22 Connection
23
24
25 Related documents:
26
27 * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
28 * [[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.
29 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
30
31
32 == 1.2 Example 2: Connect to Pulse Counter ==
33
34 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:
35
36 [[image:image-20220527092058-3.png]]
37
38 Connection
39
40
41 [[image:image-20220527092146-4.png]]
42
43 Connection
44
45 * [[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
46 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
47
48 (% class="wikigeneratedid" %)
49 == ==
50
51 == 1.3 Example3: Use RS485-LN with energy meters ==
52
53 === 1.3.1 OverView ===
54
55 (((
56 **Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
57 )))
58
59 (((
60 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
61 )))
62
63 [[image:image-20220527092419-5.png]]
64
65 Connection1
66
67
68 (((
69 How to connect with Energy Meter：
70 )))
71
72 (((
73 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.
74 )))
75
76 (((
77 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
78 )))
79
80 (((
81 Power Source VIN to RS485-LN VIN+
82 )))
83
84 (((
85 Power Source GND to RS485-LN VIN-
86 )))
87
88 (((
89 Once there is power, the RS485-LN will be on.
90 )))
91
92 [[image:image-20220527092514-6.png]]
93
94 Connection2
95
96
97
98 Connection3
99
100
101 === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
102
103 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.
104
105 [[image:https://wiki.dragino.com/images/thumb/3/35/Meter4.png/600px-Meter4.png||alt="Meter4.png" height="193" width="600"]]
106
107 (% class="box infomessage" %)
108 (((
109 Example:AT+COMMAND1=01 03 00 00 00 01 84 0A
110 )))
111
112 * The first byte : slave address code (=001～247)
113 * The second byte : read register value function code
114 * 3rd and 4th bytes: start address of register to be read
115 * 5th and 6th bytes: Number of registers to read
116 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
117
118 (((
119 How to parse the reading of the return command of the parameter：
120 )))
121
122 (% class="box infomessage" %)
123 (((
124 Example:RETURN1：01 03 02 08 FD 7E 05
125 )))
126
127 * The first byte ARD: slave address code (=001～254)
128 * The second byte: Return to read function code
129 * 3rd byte: total number of bytes
130 * 4th～5th bytes: register data
131 * The 6th and 7th bytes: CRC16 checksum
132 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
133
134 === 1.3.3 How to configure RS485-LN and parse output commands ===
135
136 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
137
138 ==== 1.3.3.1 via AT COMMAND: ====
139
140 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
141
142 (((
143 If the configured parameters and commands are incorrect, the return value is not obtained.
144 )))
145
146 [[image:https://wiki.dragino.com/images/b/bc/AT_COMMAND1.png||height="358" width="456"]]
147
148 AT COMMAND
149
150 (% class="box infomessage" %)
151 (((
152 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
153 )))
154
155 a: length for the return of AT+COMMAND
156
157 b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
158
159 c: define the position for valid value.
160
161 [[image:https://wiki.dragino.com/images/7/7d/AT_COMMAND2.png||height="278" width="477"]]
162
163 AT COMMAND
164
165 PAYLOAD is available after the valid value is intercepted.
166
167
168 [[image:https://wiki.dragino.com/images/3/3a/AT_COMMAND4.png||height="219" width="576"]]
169
170 AT COMMAND
171
172 You can get configured PAYLOAD on TTN.
173
174
175 [[image:https://wiki.dragino.com/images/thumb/c/c2/AT_COMMAND3.png/600px-AT_COMMAND3.png||height="138" width="600"]]
176
177 (((
178 AT COMMAND
179 )))
180
181 (((
182
183 )))
184
185 (((
186 **Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
187 )))
188
189 (((
190 RETURN1:01 03 02 00 02 39 85 00 00(return data)
191 )))
192
193 (((
194 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.
195 )))
196
197 (((
198 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
199 )))
200
201 (((
202 RETURN2:01 03 02 08 DC BE 1D(return data)
203 )))
204
205 (((
206 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.
207 )))
208
209 (((
210 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
211 )))
212
213 (((
214 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
215 )))
216
217 (((
218 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.
219 )))
220
221 (((
222 Payload:01 00 02 39 85 08 DC 00 00 00 44
223 )))
224
225 [[image:https://wiki.dragino.com/images/thumb/9/9b/AT_COMMAND10.png/600px-AT_COMMAND10.png||height="278" width="600"]]
226
227 AT COMMAND
228
229 01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.
230
231
232 [[~[~[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]]
233
234 AT COMMAND
235
236
237 ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
238
239 [[image:image-20220512104358-3.png]]
240
241 (((
242 DOWNLINK
243 )))
244
245 (((
246
247 )))
248
249 (((
250 **Type Code 0xAF**
251 )))
252
253 (((
254 (% class="box infomessage" %)
255 (((
256 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
257 )))
258 )))
259
260 (((
261 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
262 )))
263
264 (((
265 Format: AF MM NN LL XX XX XX XX YY
266 )))
267
268 (((
269 Where:
270 )))
271
272 (((
273 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
274 )))
275
276 (((
277 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
278 )))
279
280 (((
281 LL: The length of AT+COMMAND or AT+DATACUT command
282 )))
283
284 (((
285 XX XX XX XX: AT+COMMAND or AT+DATACUT command
286 )))
287
288 (((
289 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
290 )))
291
292 (((
293 will execute an uplink after got this command.
294 )))
295
296 (((
297 Example:
298 )))
299
300 (((
301 AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
302 )))
303
304 [[image:https://wiki.dragino.com/images/thumb/4/45/DOWNLINK_METER2.png/600px-DOWNLINK_METER2.png||height="208" width="600"]]
305
306 DOWNLINK
307
308
309 [[~[~[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]]
310
311 DOWNLINK
312
313
314 [[image:https://wiki.dragino.com/images/thumb/2/27/DOWNLINK_METER4.png/600px-DOWNLINK_METER4.png||height="210" width="600"]]
315
316 DOWNLINK
317
318
319 [[~[~[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]]
320
321 DOWNLINK
322
323
324 [[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
325
326 DOWNLINK
327
328
329 === 1.3.4 How to configure and output commands for RS485 to USB ===
330
331 (((
332 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.
333 )))
334
335 (((
336 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
337 )))
338
339 (((
340 Open the serial port debugging, set the send and receive to HEX.
341 )))
342
343 (((
344 Baud rate: 9600
345 )))
346
347 (((
348 check digit: Even
349 )))
350
351 [[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="725" width="544"]]
352
353 USB
354
355
356 [[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="728" width="546"]]
357
358 USB
359
360
361 (((
362 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.
363 )))
364
365 (((
366 **Example:**  input：01 03 00 31 00 02 95 c4
367 )))
368
369 (((
370 output：01 03 04 00 00 00 42 7A 02
371 )))
372
373 [[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
374
375 USB
376
377 === 1.3.5 How to configure multiple devices and modify device addresses ===
378
379 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.
380
381 (((
382 (((
383 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
384 )))
385 )))
386
387 [[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
388
389 **Example**:These two meters are examples of setting parameters and device addresses.
390
391 [[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="737" width="553"]]
392
393 [[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="733" width="550"]]
394
395 (((
396 (((
397 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.
398 )))
399 )))
400
401 (((
402 (((
403 We can use AT+CFGDEV to set the device address.
404 )))
405 )))
406
407 (((
408 (((
409 We modify the device address 01 of the first energy meter to 02.
410 )))
411 )))
412
413 [[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
414
415 AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
416
417 * 01:device adaress
418
419 * 10:function code
420
421 * 00 61：Register address
422
423 * 00 01：Number of Registers
424
425 * 02：Number of bytes
426
427 * 00 02：Modified device address
428
429 * 1：Check code
430
431 The device address setting of the energy meter is complete.
432
433 Another energy meter is a single active energy meter with a floating-point format.
434
435 Its default device address is 01, and the following are the parameters for configuring two energy meters.
436
437 [[image:https://wiki.dragino.com/images/1/13/Meter11.png||alt="Meter11.png" height="576" width="379"]]
438
439 [[image:https://wiki.dragino.com/images/thumb/7/7e/Meter12.png/600px-Meter12.png||alt="Meter12.png" height="262" width="600"]]
440
441 PAYLOAD:01 08 DF 43 62
442
443 * 08 DF is the valid value of the meter with device address 02.
444 * 43 62 is the valid value of the meter with device address 01.
445
446 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
447
448 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:
449
450 [[image:https://wiki.dragino.com/images/thumb/f/fa/RS485_04_2.png/600px-RS485_04_2.png||height="336" width="600"]]
451
452 Connection
453
454 * [[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
455
456 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
457
458 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:
459
460 * [[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
461
462 * [[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
463
464 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
465
466 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:
467
468 * [[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
469
470 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
471
472 [[image:https://wiki.dragino.com/images/thumb/9/97/PLC_M221.png/600px-PLC_M221.png||height="353" width="600"]]
473
474 Network Structure
475
476 * [[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