Version 57.17 by Xiaoling on 2022/07/14 09:58
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1 **Table of Contents:**
2
3 {{toc/}}
4
5
6
7
8
9
10 = **1. Introduction** =
11
12
13 This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
14
15
16 == **1.1 Example 1: Connect to Leak relay and VFD** ==
17
18
19 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:
20
21 [[image:image-20220527091852-1.png]]
22
23 Connection
24
25
26
27 [[image:image-20220527091942-2.png]](% style="display:none" %)
28
29 Connection
30
31
32 (% style="color:blue" %)**Related documents:**
33
34 * System Structure:  [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/||style="background-color: rgb(255, 255, 255);"]]
35 * Explanation on how to integrate to Node-red and to the Mobile Phone, and with link to the Github code:  [[Configure Manual>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/||style="background-color: rgb(255, 255, 255);"]]
36 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
37
38
39 == **1.2 Example 2: Connect to Pulse Counter** ==
40
41
42 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:
43
44
45 [[image:image-20220527092058-3.png]]
46
47 Connection
48
49
50
51 [[image:image-20220527092146-4.png]]
52
53 Connection
54
55
56 (% style="color:blue" %)**Related documents:**
57
58 * Configure Document:  [[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/]]
59 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
60
61
62
63 == **1.3 Example3: Use RS485-LN with energy meters** ==
64
65
66 === **1.3.1 OverView** ===
67
68
69 (((
70 (% style="color:red" %)**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
71 )))
72
73 (((
74 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
75 )))
76
77 [[image:image-20220527092419-5.png]]
78
79 Connection1
80
81
82
83 (((
84 (% style="color:blue" %)**How to connect with Energy Meter：**
85
86
87 )))
88
89 (((
90 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.
91 )))
92
93 (((
94 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
95 )))
96
97 (((
98 Power Source VIN to RS485-LN VIN+
99 )))
100
101 (((
102 Power Source GND to RS485-LN VIN-
103 )))
104
105 (((
106 Once there is power, the RS485-LN will be on.
107 )))
108
109 [[image:image-20220527092514-6.png]]
110
111 Connection2
112
113
114 [[image:image-20220527092555-7.png]]
115
116 Connection3
117
118
119 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
120
121
122 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.
123
124 [[image:image-20220601143257-10.png]]
125
126
127 (% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
128
129 * The first byte : slave address code (=001～247)
130 * The second byte : read register value function code
131 * 3rd and 4th bytes: start address of register to be read
132 * 5th and 6th bytes: Number of registers to read
133 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
134
135 (((
136
137
138
139 How to parse the reading of the return command of the parameter：
140
141 (% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
142 )))
143
144 * The first byte ARD: slave address code (=001～254)
145 * The second byte: Return to read function code
146 * 3rd byte: total number of bytes
147 * 4th～5th bytes: register data
148 * The 6th and 7th bytes: CRC16 checksum
149 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
150
151 (% class="wikigeneratedid" %)
152 (((
153
154
155
156
157 )))
158
159 === **1.3.3 How to configure RS485-LN and parse output commands** ===
160
161
162 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
163
164
165 ==== **1.3.3.1 via AT COMMAND** ====
166
167
168 First, we can use (% style="color:blue" %)**AT+CFGDEV**(%%) to get the return value, and we can also judge whether the input parameters are correct.
169
170 (((
171 If the configured parameters and commands are incorrect, the return value is not obtained.
172 )))
173
174 [[image:image-20220601143201-9.png]]
175
176 AT COMMAND
177
178
179 (% class="box infomessage" %)
180 (((
181 **AT+DATACUTx **:  This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
182 )))
183
184 a:  length for the return of AT+COMMAND
185
186 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
187
188 c:  define the position for valid value.
189
190 [[image:image-20220601143115-8.png]]
191
192 AT COMMAND
193
194
195
196 PAYLOAD is available after the valid value is intercepted.
197
198
199 [[image:image-20220601143046-7.png]]
200
201 AT COMMAND
202
203
204
205 You can get configured PAYLOAD on TTN.
206
207 [[image:image-20220601143519-1.png]]
208
209 (((
210 AT COMMAND
211 )))
212
213 (((
214
215 )))
216
217 (((
218 (% style="color:blue" %)**Example**:
219
220 **CMD1:** Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
221 )))
222
223 (((
224 RETURN1: 01 03 02 00 02 39 85 00 00(return data)
225 )))
226
227 (((
228 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.
229
230
231 )))
232
233 (((
234 **CMD2: **Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
235 )))
236
237 (((
238 RETURN2: 01 03 02 08 DC BE 1D(return data)
239 )))
240
241 (((
242 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.
243
244
245 )))
246
247 (((
248 **CMD3:** Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
249 )))
250
251 (((
252 RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
253 )))
254
255 (((
256 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.
257 )))
258
259 (((
260 Payload: 01 00 02 39 85 08 DC 00 00 00 44
261 )))
262
263 [[image:image-20220601142936-6.png]]
264
265 AT COMMAND
266
267
268 (% style="color:#4f81bd" %)**01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.**
269
270
271 [[image:image-20220601143642-2.png]]
272
273 AT COMMAND
274
275
276 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
277
278
279 [[image:image-20220527093358-15.png]]
280
281 (((
282 DOWNLINK
283 )))
284
285 (((
286
287 )))
288
289 (((
290 (% style="color:#4f81bd" %)**Type Code 0xAF**
291 )))
292
293 (((
294 (% class="box infomessage" %)
295 (((
296 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
297 )))
298 )))
299
300 (((
301 (% style="color:red" %)Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
302 )))
303
304 (((
305 Format: AF MM NN LL XX XX XX XX YY
306 )))
307
308 (((
309 Where:
310 )))
311
312 (((
313 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
314 )))
315
316 (((
317 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
318 )))
319
320 (((
321 LL: The length of AT+COMMAND or AT+DATACUT command
322 )))
323
324 (((
325 XX XX XX XX: AT+COMMAND or AT+DATACUT command
326 )))
327
328 (((
329 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
330 )))
331
332 (((
333 will execute an uplink after got this command.
334 )))
335
336 (((
337
338
339 (% style="color:blue" %)**Example:**
340 )))
341
342 (((
343 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
344 )))
345
346 [[image:image-20220601144149-6.png]]
347
348 DOWNLINK
349
350
351
352 [[image:image-20220601143803-3.png]]
353
354 DOWNLINK
355
356
357
358 [[image:image-20220601144053-5.png]]
359
360 DOWNLINK
361
362
363
364 [[image:image-20220601143921-4.png]]
365
366 DOWNLINK
367
368
369
370 [[image:image-20220601142805-5.png]]
371
372 DOWNLINK
373
374
375 === **1.3.4 How to configure and output commands for RS485 to USB** ===
376
377 (((
378 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.
379 )))
380
381 (((
382 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
383 )))
384
385 (((
386 Open the serial port debugging, set the send and receive to HEX.
387 )))
388
389 (((
390 Baud rate: 9600
391 )))
392
393 (((
394 check digit: Even
395
396
397 )))
398
399 [[image:image-20220527093708-21.png]]
400
401 USB
402
403
404
405 [[image:image-20220527093747-22.png]]
406
407 USB
408
409
410
411 (((
412 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.
413
414
415 )))
416
417 (((
418 (% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
419 )))
420
421 (((
422 output：01 03 04 00 00 00 42 7A 02
423
424
425 )))
426
427 [[image:image-20220527093821-23.png]]
428
429 USB
430
431
432 === **1.3.5 How to configure multiple devices and modify device addresses** ===
433
434
435 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.
436
437 (((
438 (((
439 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
440 )))
441 )))
442
443 [[image:image-20220601142044-1.png]]
444
445
446 (% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
447
448 [[image:image-20220527093950-25.png]]
449
450
451 [[image:image-20220527094028-26.png]]
452
453
454 (((
455 (((
456 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.
457 )))
458 )))
459
460 (((
461 (((
462 We can use **AT+CFGDEV** to set the device address.
463 )))
464 )))
465
466 (((
467 (((
468 We modify the device address 01 of the first energy meter to 02.
469 )))
470 )))
471
472 [[image:image-20220601142354-2.png]]
473
474
475 (% class="box infomessage" %)
476 (((
477 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
478 )))
479
480 * 01:device adaress
481
482 * 10:function code
483
484 * 00 61：Register address
485
486 * 00 01：Number of Registers
487
488 * 02：Number of bytes
489
490 * 00 02：Modified device address
491
492 * 1：Check code
493
494 The device address setting of the energy meter is complete.
495
496 Another energy meter is a single active energy meter with a floating-point format.
497
498 Its default device address is 01, and the following are the parameters for configuring two energy meters.
499
500 [[image:image-20220601142452-3.png]]
501
502
503 [[image:image-20220601142607-4.png]]
504
505
506 **PAYLOAD:01 08 DF 43 62**
507
508 * 08 DF is the valid value of the meter with device address 02.
509 * 43 62 is the valid value of the meter with device address 01.
510
511
512 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
513
514
515 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.
516
517 The structure is like below:
518
519 [[image:image-20220527094330-30.png]]
520
521 Connection
522
523
524 * Configure Documen:  [[Circuit Breaker Remote Open Close>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Circuit_Breaker_Remote_Open_Close/]]
525
526
527 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
528
529
530 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:
531
532 * Configure Document For RS485-BL:  [[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||style="background-color: rgb(255, 255, 255);"]]
533 * Configure Document for RS485-LN:  [[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]]
534
535
536 == 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
537
538
539 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:
540
541 * Configure Document For RS485-LN:  [[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||style="background-color: rgb(255, 255, 255);"]]
542
543
544 == 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
545
546
547 [[image:image-20220527094556-31.png]]
548
549 Network Structure
550
551
552 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]

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