Version 57.23 by Xiaoling on 2022/07/14 10:12
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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 == **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
120 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
121
122
123 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.
124
125 [[image:image-20220601143257-10.png]]
126
127
128 (% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
129
130 * The first byte : slave address code (=001～247)
131 * The second byte : read register value function code
132 * 3rd and 4th bytes: start address of register to be read
133 * 5th and 6th bytes: Number of registers to read
134 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
135
136 (((
137
138
139
140 How to parse the reading of the return command of the parameter：
141
142 (% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
143 )))
144
145 * The first byte ARD: slave address code (=001～254)
146 * The second byte: Return to read function code
147 * 3rd byte: total number of bytes
148 * 4th～5th bytes: register data
149 * The 6th and 7th bytes: CRC16 checksum
150 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
151
152 (% class="wikigeneratedid" %)
153 (((
154
155
156
157
158 )))
159
160 === **1.3.3 How to configure RS485-LN and parse output commands** ===
161
162
163 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
164
165
166
167 ==== **1.3.3.1 via AT COMMAND** ====
168
169
170 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.
171
172 (((
173 If the configured parameters and commands are incorrect, the return value is not obtained.
174 )))
175
176 [[image:image-20220601143201-9.png]]
177
178 AT COMMAND
179
180
181 (% class="box infomessage" %)
182 (((
183 **AT+DATACUTx **:  This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
184 )))
185
186 a:  length for the return of AT+COMMAND
187
188 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
189
190 c:  define the position for valid value.
191
192 [[image:image-20220601143115-8.png]]
193
194 AT COMMAND
195
196
197
198 PAYLOAD is available after the valid value is intercepted.
199
200
201 [[image:image-20220601143046-7.png]]
202
203 AT COMMAND
204
205
206
207 You can get configured PAYLOAD on TTN.
208
209 [[image:image-20220601143519-1.png]]
210
211 (((
212 AT COMMAND
213 )))
214
215 (((
216
217 )))
218
219 (((
220 (% style="color:blue" %)**Example**:
221
222 (% style="color:red" %)**CMD1:**(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
223 )))
224
225 (((
226 RETURN1: 01 03 02 00 02 39 85 00 00(return data)
227 )))
228
229 (((
230 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.
231
232
233 )))
234
235 (((
236 (% style="color:red" %)**CMD2: **(%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
237 )))
238
239 (((
240 RETURN2: 01 03 02 08 DC BE 1D(return data)
241 )))
242
243 (((
244 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.
245
246
247 )))
248
249 (((
250 (% style="color:red" %)**CMD3:**(%%) Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
251 )))
252
253 (((
254 RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
255 )))
256
257 (((
258 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.
259 )))
260
261 (((
262 Payload: 01 00 02 39 85 08 DC 00 00 00 44
263 )))
264
265 [[image:image-20220601142936-6.png]]
266
267 AT COMMAND
268
269
270 (% 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.**
271
272
273 [[image:image-20220601143642-2.png]]
274
275 AT COMMAND
276
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
379 === **1.3.4 How to configure and output commands for RS485 to USB** ===
380
381 (((
382 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.
383 )))
384
385 (((
386 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
387 )))
388
389 (((
390 Open the serial port debugging, set the send and receive to HEX.
391 )))
392
393 (((
394 Baud rate: 9600
395 )))
396
397 (((
398 check digit: Even
399
400
401 )))
402
403 [[image:image-20220527093708-21.png]]
404
405 USB
406
407
408
409 [[image:image-20220527093747-22.png]]
410
411 USB
412
413
414
415 (((
416 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.
417
418
419 )))
420
421 (((
422 (% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
423 )))
424
425 (((
426 output：01 03 04 00 00 00 42 7A 02
427
428
429 )))
430
431 [[image:image-20220527093821-23.png]]
432
433 USB
434
435
436
437 === **1.3.5 How to configure multiple devices and modify device addresses** ===
438
439
440 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.
441
442 (((
443 (((
444 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
445 )))
446 )))
447
448 [[image:image-20220601142044-1.png]]
449
450
451 (% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
452
453 [[image:image-20220527093950-25.png]]
454
455
456 [[image:image-20220527094028-26.png]]
457
458
459 (((
460 (((
461 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.
462 )))
463 )))
464
465 (((
466 (((
467 We can use **AT+CFGDEV** to set the device address.
468 )))
469 )))
470
471 (((
472 (((
473 We modify the device address 01 of the first energy meter to 02.
474 )))
475 )))
476
477 [[image:image-20220601142354-2.png]]
478
479
480 (% class="box infomessage" %)
481 (((
482 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
483 )))
484
485 * 01:device adaress
486
487 * 10:function code
488
489 * 00 61：Register address
490
491 * 00 01：Number of Registers
492
493 * 02：Number of bytes
494
495 * 00 02：Modified device address
496
497 * 1：Check code
498
499 The device address setting of the energy meter is complete.
500
501 Another energy meter is a single active energy meter with a floating-point format.
502
503 Its default device address is 01, and the following are the parameters for configuring two energy meters.
504
505 [[image:image-20220601142452-3.png]]
506
507
508 [[image:image-20220601142607-4.png]]
509
510
511 (% style="color:blue" %)**PAYLOAD: 01 08 DF 43 62**
512
513 * 08 DF is the valid value of the meter with device address 02.
514 * 43 62 is the valid value of the meter with device address 01.
515
516
517
518
519 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
520
521
522 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.
523
524 The structure is like below:
525
526 [[image:image-20220527094330-30.png]]
527
528 Connection
529
530
531 * 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/]]
532
533
534
535
536 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or 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-BL to connect to SEM Three Energy Meter and send the data to mobile phone for remote minitor. The structure is like below:
540
541 * 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);"]]
542 * 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]]
543
544
545
546
547 == 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
548
549
550 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:
551
552 * 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);"]]
553
554
555
556
557 == 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
558
559
560 [[image:image-20220527094556-31.png]]
561
562 Network Structure
563
564
565 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]
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