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Version 57.16 by Xiaoling on 2022/07/14 09:55
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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
40 == **1.2 Example 2: Connect to Pulse Counter** ==
41
42
43 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:
44
45
46 [[image:image-20220527092058-3.png]]
47
48 Connection
49
50
51
52 [[image:image-20220527092146-4.png]]
53
54 Connection
55
56
57 (% style="color:blue" %)**Related documents:**
58
59 * 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/]]
60 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
61
62
63
64
65 == **1.3 Example3: Use RS485-LN with energy meters** ==
66
67
68 === **1.3.1 OverView** ===
69
70
71 (((
72 (% style="color:red" %)**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
73 )))
74
75 (((
76 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
77 )))
78
79 [[image:image-20220527092419-5.png]]
80
81 Connection1
82
83
84
85 (((
86 (% style="color:blue" %)**How to connect with Energy Meter：**
87
88
89 )))
90
91 (((
92 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.
93 )))
94
95 (((
96 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
97 )))
98
99 (((
100 Power Source VIN to RS485-LN VIN+
101 )))
102
103 (((
104 Power Source GND to RS485-LN VIN-
105 )))
106
107 (((
108 Once there is power, the RS485-LN will be on.
109 )))
110
111 [[image:image-20220527092514-6.png]]
112
113 Connection2
114
115
116
117 [[image:image-20220527092555-7.png]]
118
119 Connection3
120
121
122 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
123
124
125 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.
126
127 [[image:image-20220601143257-10.png]]
128
129
130 (% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
131
132 * The first byte : slave address code (=001～247)
133 * The second byte : read register value function code
134 * 3rd and 4th bytes: start address of register to be read
135 * 5th and 6th bytes: Number of registers to read
136 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
137
138 (((
139
140
141
142 How to parse the reading of the return command of the parameter：
143
144 (% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
145 )))
146
147 * The first byte ARD: slave address code (=001～254)
148 * The second byte: Return to read function code
149 * 3rd byte: total number of bytes
150 * 4th～5th bytes: register data
151 * The 6th and 7th bytes: CRC16 checksum
152 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
153
154 (% class="wikigeneratedid" %)
155 (((
156
157
158
159
160 )))
161
162 === **1.3.3 How to configure RS485-LN and parse output commands** ===
163
164
165 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
166
167
168 ==== **1.3.3.1 via AT COMMAND** ====
169
170
171 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.
172
173 (((
174 If the configured parameters and commands are incorrect, the return value is not obtained.
175 )))
176
177 [[image:image-20220601143201-9.png]]
178
179 AT COMMAND
180
181
182 (% class="box infomessage" %)
183 (((
184 **AT+DATACUTx **:  This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
185 )))
186
187 a:  length for the return of AT+COMMAND
188
189 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
190
191 c:  define the position for valid value.
192
193 [[image:image-20220601143115-8.png]]
194
195 AT COMMAND
196
197
198
199 PAYLOAD is available after the valid value is intercepted.
200
201
202 [[image:image-20220601143046-7.png]]
203
204 AT COMMAND
205
206
207
208 You can get configured PAYLOAD on TTN.
209
210 [[image:image-20220601143519-1.png]]
211
212 (((
213 AT COMMAND
214 )))
215
216 (((
217
218 )))
219
220 (((
221 (% style="color:blue" %)**Example**:
222
223 CMD1: Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
224 )))
225
226 (((
227 RETURN1: 01 03 02 00 02 39 85 00 00(return data)
228 )))
229
230 (((
231 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.
232
233
234 )))
235
236 (((
237 CMD2: Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
238 )))
239
240 (((
241 RETURN2: 01 03 02 08 DC BE 1D(return data)
242 )))
243
244 (((
245 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.
246
247
248 )))
249
250 (((
251 CMD3: Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
252 )))
253
254 (((
255 RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
256 )))
257
258 (((
259 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.
260 )))
261
262 (((
263 Payload: 01 00 02 39 85 08 DC 00 00 00 44
264 )))
265
266 [[image:image-20220601142936-6.png]]
267
268 AT COMMAND
269
270
271 (% 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.**
272
273
274 [[image:image-20220601143642-2.png]]
275
276 AT COMMAND
277
278
279 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
280
281
282 [[image:image-20220527093358-15.png]]
283
284 (((
285 DOWNLINK
286 )))
287
288 (((
289
290 )))
291
292 (((
293 (% style="color:#4f81bd" %)**Type Code 0xAF**
294 )))
295
296 (((
297 (% class="box infomessage" %)
298 (((
299 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
300 )))
301 )))
302
303 (((
304 (% style="color:red" %)Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
305 )))
306
307 (((
308 Format: AF MM NN LL XX XX XX XX YY
309 )))
310
311 (((
312 Where:
313 )))
314
315 (((
316 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
317 )))
318
319 (((
320 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
321 )))
322
323 (((
324 LL: The length of AT+COMMAND or AT+DATACUT command
325 )))
326
327 (((
328 XX XX XX XX: AT+COMMAND or AT+DATACUT command
329 )))
330
331 (((
332 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
333 )))
334
335 (((
336 will execute an uplink after got this command.
337 )))
338
339 (((
340
341
342 (% style="color:blue" %)**Example:**
343 )))
344
345 (((
346 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
347 )))
348
349 [[image:image-20220601144149-6.png]]
350
351 DOWNLINK
352
353
354
355 [[image:image-20220601143803-3.png]]
356
357 DOWNLINK
358
359
360
361 [[image:image-20220601144053-5.png]]
362
363 DOWNLINK
364
365
366
367 [[image:image-20220601143921-4.png]]
368
369 DOWNLINK
370
371
372
373 [[image:image-20220601142805-5.png]]
374
375 DOWNLINK
376
377
378 === **1.3.4 How to configure and output commands for RS485 to USB** ===
379
380 (((
381 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.
382 )))
383
384 (((
385 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
386 )))
387
388 (((
389 Open the serial port debugging, set the send and receive to HEX.
390 )))
391
392 (((
393 Baud rate: 9600
394 )))
395
396 (((
397 check digit: Even
398
399
400 )))
401
402 [[image:image-20220527093708-21.png]]
403
404 USB
405
406
407
408 [[image:image-20220527093747-22.png]]
409
410 USB
411
412
413
414 (((
415 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.
416
417
418 )))
419
420 (((
421 (% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
422 )))
423
424 (((
425 output：01 03 04 00 00 00 42 7A 02
426
427
428 )))
429
430 [[image:image-20220527093821-23.png]]
431
432 USB
433
434
435 === **1.3.5 How to configure multiple devices and modify device addresses** ===
436
437
438 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.
439
440 (((
441 (((
442 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
443 )))
444 )))
445
446 [[image:image-20220601142044-1.png]]
447
448
449 (% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
450
451 [[image:image-20220527093950-25.png]]
452
453
454 [[image:image-20220527094028-26.png]]
455
456
457 (((
458 (((
459 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.
460 )))
461 )))
462
463 (((
464 (((
465 We can use **AT+CFGDEV** to set the device address.
466 )))
467 )))
468
469 (((
470 (((
471 We modify the device address 01 of the first energy meter to 02.
472 )))
473 )))
474
475 [[image:image-20220601142354-2.png]]
476
477
478 (% class="box infomessage" %)
479 (((
480 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
481 )))
482
483 * 01:device adaress
484
485 * 10:function code
486
487 * 00 61：Register address
488
489 * 00 01：Number of Registers
490
491 * 02：Number of bytes
492
493 * 00 02：Modified device address
494
495 * 1：Check code
496
497 The device address setting of the energy meter is complete.
498
499 Another energy meter is a single active energy meter with a floating-point format.
500
501 Its default device address is 01, and the following are the parameters for configuring two energy meters.
502
503 [[image:image-20220601142452-3.png]]
504
505
506 [[image:image-20220601142607-4.png]]
507
508
509 **PAYLOAD:01 08 DF 43 62**
510
511 * 08 DF is the valid value of the meter with device address 02.
512 * 43 62 is the valid value of the meter with device address 01.
513
514
515
516 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
517
518
519 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.
520
521 The structure is like below:
522
523 [[image:image-20220527094330-30.png]]
524
525 Connection
526
527
528 * 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/]]
529
530
531
532 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
533
534
535 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:
536
537 * 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);"]]
538 * 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]]
539
540
541
542 == 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
543
544
545 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:
546
547 * 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);"]]
548
549
550
551 == 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
552
553
554 [[image:image-20220527094556-31.png]]
555
556 Network Structure
557
558
559 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]