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Version 60.7 by Xiaoling on 2022/09/19 16:08
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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
17 == **1.1 Example 1: Connect to Leak relay and VFD** ==
18
19
20 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:
21
22
23 [[image:image-20220527091852-1.png]]
24
25 Connection
26
27
28
29 [[image:image-20220527091942-2.png]](% style="display:none" %)
30
31 Connection
32
33
34 (% style="color:blue" %)**Related documents:**
35
36 * System Structure:  [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/||_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
37 * 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/||_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
38 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
39
40
41
42
43 == **1.2 Example 2: Connect to Pulse Counter** ==
44
45
46 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:
47
48
49 [[image:image-20220527092058-3.png]]
50
51 Connection
52
53
54
55 [[image:image-20220527092146-4.png]]
56
57 Connection
58
59
60 (% style="color:blue" %)**Related documents:**
61
62 * 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/||_mstmutation="1"]]
63 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
64
65
66
67
68 == **1.3 Example3: Use RS485-LN with energy meters** ==
69
70
71 === **1.3.1 OverView** ===
72
73
74 (((
75 (% style="color:red" %)**Note**：**The specifications of each energy meter are different, please refer to your own energy meter specifications.**
76 )))
77
78 (((
79 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
80
81
82 )))
83
84 [[image:image-20220527092419-5.png]]
85
86 Connection1
87
88
89
90 (((
91 (% style="color:blue" %)**How to connect with Energy Meter：**
92
93
94 )))
95
96 (((
97 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.
98 )))
99
100 (((
101 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
102 )))
103
104 (((
105 Power Source VIN to RS485-LN VIN+
106 )))
107
108 (((
109 Power Source GND to RS485-LN VIN-
110 )))
111
112 (((
113 Once there is power, the RS485-LN will be on.
114
115
116 )))
117
118 [[image:image-20220527092514-6.png]]
119
120 Connection2
121
122
123
124 [[image:image-20220527092555-7.png]]
125
126 Connection3
127
128
129
130 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
131
132
133 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.
134
135 [[image:image-20220601143257-10.png]]
136
137
138 (% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
139
140 * The first byte : slave address code (=001～247)
141 * The second byte : read register value function code
142 * 3rd and 4th bytes: start address of register to be read
143 * 5th and 6th bytes: Number of registers to read
144 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
145
146 (((
147
148
149
150 How to parse the reading of the return command of the parameter：
151
152 (% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
153 )))
154
155 * The first byte ARD: slave address code (=001～254)
156 * The second byte: Return to read function code
157 * 3rd byte: total number of bytes
158 * 4th～5th bytes: register data
159 * The 6th and 7th bytes: CRC16 checksum
160 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
161
162 (% class="wikigeneratedid" %)
163 (((
164
165
166
167
168 )))
169
170 === **1.3.3 How to configure RS485-LN and parse output commands** ===
171
172
173 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
174
175
176
177 ==== **1.3.3.1 via AT COMMAND** ====
178
179
180 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.
181
182 (((
183 If the configured parameters and commands are incorrect, the return value is not obtained.
184
185
186 )))
187
188 [[image:image-20220601143201-9.png]]
189
190 AT COMMAND
191
192
193 (% class="box infomessage" %)
194 (((
195 (% _mstmutation="1" %)**AT+DATACUTx **(%%):  This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
196 )))
197
198 a:  length for the return of AT+COMMAND
199
200 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
201
202 c:  define the position for valid value.
203
204 [[image:image-20220601143115-8.png]]
205
206 AT COMMAND
207
208
209
210 PAYLOAD is available after the valid value is intercepted.
211
212
213 [[image:image-20220601143046-7.png]]
214
215 AT COMMAND
216
217
218
219 You can get configured PAYLOAD on TTN.
220
221 [[image:image-20220601143519-1.png]]
222
223 (((
224 AT COMMAND
225 )))
226
227 (((
228
229
230
231 )))
232
233 (((
234 (% style="color:blue" %)**Example**:
235
236
237 (% style="color:red" %)**CMD1:**(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
238 )))
239
240 (((
241 RETURN1: 01 03 02 00 02 39 85 00 00(return data)
242 )))
243
244 (((
245 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.
246
247
248 )))
249
250 (((
251 (% style="color:red" %)**CMD2: **(%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
252 )))
253
254 (((
255 RETURN2: 01 03 02 08 DC BE 1D(return data)
256 )))
257
258 (((
259 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.
260
261
262 )))
263
264 (((
265 (% style="color:red" %)**CMD3:**(%%) Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
266 )))
267
268 (((
269 RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
270 )))
271
272 (((
273 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.
274 )))
275
276 (((
277 Payload: 01 00 02 39 85 08 DC 00 00 00 44
278
279
280 )))
281
282 [[image:image-20220601142936-6.png]]
283
284 AT COMMAND
285
286
287
288 (% style="color:blue" %)**01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.**
289
290
291 [[image:image-20220601143642-2.png]]
292
293 AT COMMAND
294
295
296
297 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
298
299
300 [[image:image-20220527093358-15.png]]
301
302 (((
303 DOWNLINK
304 )))
305
306 (((
307
308 )))
309
310 (((
311 (% style="color:blue" %)**Type Code 0xAF**
312 )))
313
314 (((
315 (% class="box infomessage" %)
316 (((
317 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
318 )))
319 )))
320
321 (((
322 (% style="color:red" %)**Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.**
323
324
325 )))
326
327 (((
328 Format: AF MM NN LL XX XX XX XX YY
329 )))
330
331 (((
332 Where:
333 )))
334
335 (((
336 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
337 )))
338
339 (((
340 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
341 )))
342
343 (((
344 LL: The length of AT+COMMAND or AT+DATACUT command
345 )))
346
347 (((
348 XX XX XX XX: AT+COMMAND or AT+DATACUT command
349 )))
350
351 (((
352 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
353 )))
354
355 (((
356 will execute an uplink after got this command.
357 )))
358
359 (((
360
361
362 (% style="color:blue" %)**Example:**
363 )))
364
365 (((
366 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
367 )))
368
369 [[image:image-20220601144149-6.png]]
370
371 DOWNLINK
372
373
374
375 [[image:image-20220601143803-3.png]]
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377 DOWNLINK
378
379
380
381 [[image:image-20220601144053-5.png]]
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383 DOWNLINK
384
385
386
387 [[image:image-20220601143921-4.png]]
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389 DOWNLINK
390
391
392
393 [[image:image-20220601142805-5.png]]
394
395 DOWNLINK
396
397
398
399 === **1.3.4 How to configure and output commands for RS485 to USB** ===
400
401
402 (((
403 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.
404 )))
405
406 (((
407 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
408 )))
409
410 (((
411 Open the serial port debugging, set the send and receive to HEX.
412 )))
413
414 (((
415 Baud rate: 9600
416 )))
417
418 (((
419 check digit: Even
420
421
422 )))
423
424 [[image:image-20220527093708-21.png]]
425
426 USB
427
428
429
430 [[image:image-20220527093747-22.png]]
431
432 USB
433
434
435
436 (((
437 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.
438
439
440 )))
441
442 (((
443 (% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
444 )))
445
446 (((
447 output：01 03 04 00 00 00 42 7A 02
448
449
450 )))
451
452 [[image:image-20220527093821-23.png]]
453
454 USB
455
456
457
458 === **1.3.5 How to configure multiple devices and modify device addresses** ===
459
460
461 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.
462
463 (((
464 (((
465 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
466 )))
467 )))
468
469 [[image:image-20220601142044-1.png]]
470
471
472 (% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
473
474 [[image:image-20220527093950-25.png]]
475
476
477 [[image:image-20220527094028-26.png]]
478
479
480 (((
481 (((
482 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.
483 )))
484 )))
485
486 (((
487 (((
488 We can use (% style="color:blue" %)**AT+CFGDEV**(%%) to set the device address.
489 )))
490 )))
491
492 (((
493 (((
494 We modify the device address 01 of the first energy meter to 02.
495 )))
496 )))
497
498 [[image:image-20220601142354-2.png]]
499
500
501 (% class="box infomessage" %)
502 (((
503 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
504 )))
505
506 * 01:device adaress
507
508 * 10:function code
509
510 * 00 61：Register address
511
512 * 00 01：Number of Registers
513
514 * 02：Number of bytes
515
516 * 00 02：Modified device address
517
518 * 1：Check code
519
520 The device address setting of the energy meter is complete.
521
522 Another energy meter is a single active energy meter with a floating-point format.
523
524 Its default device address is 01, and the following are the parameters for configuring two energy meters.
525
526 [[image:image-20220601142452-3.png]]
527
528
529 [[image:image-20220601142607-4.png]]
530
531
532 (% style="color:blue" %)**PAYLOAD: 01 08 DF 43 62**
533
534 * 08 DF is the valid value of the meter with device address 02.
535 * 43 62 is the valid value of the meter with device address 01.
536
537 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
538
539
540 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.
541
542 The structure is like below:
543
544 [[image:image-20220527094330-30.png]]
545
546 Connection
547
548
549 * 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/||_mstmutation="1"]]
550
551 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
552
553
554 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:
555
556 * 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||_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
557 * 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||_mstmutation="1"]]
558
559 == 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
560
561
562 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:
563
564 * 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||_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
565
566 == 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
567
568
569 [[image:image-20220527094556-31.png]]
570
571 Network Structure
572
573
574 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]