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Version 60.8 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 == **1.2 Example 2: Connect to Pulse Counter** ==
43
44
45 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:
46
47
48 [[image:image-20220527092058-3.png]]
49
50 Connection
51
52
53
54 [[image:image-20220527092146-4.png]]
55
56 Connection
57
58
59 (% style="color:blue" %)**Related documents:**
60
61 * 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"]]
62 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
63
64
65
66 == **1.3 Example3: Use RS485-LN with energy meters** ==
67
68
69 === **1.3.1 OverView** ===
70
71
72 (((
73 (% style="color:red" %)**Note**：**The specifications of each energy meter are different, please refer to your own energy meter specifications.**
74 )))
75
76 (((
77 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
78
79
80 )))
81
82 [[image:image-20220527092419-5.png]]
83
84 Connection1
85
86
87
88 (((
89 (% style="color:blue" %)**How to connect with Energy Meter：**
90
91
92 )))
93
94 (((
95 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.
96 )))
97
98 (((
99 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
100 )))
101
102 (((
103 Power Source VIN to RS485-LN VIN+
104 )))
105
106 (((
107 Power Source GND to RS485-LN VIN-
108 )))
109
110 (((
111 Once there is power, the RS485-LN will be on.
112
113
114 )))
115
116 [[image:image-20220527092514-6.png]]
117
118 Connection2
119
120
121
122 [[image:image-20220527092555-7.png]]
123
124 Connection3
125
126
127
128 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
129
130
131 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.
132
133 [[image:image-20220601143257-10.png]]
134
135
136 (% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
137
138 * The first byte : slave address code (=001～247)
139 * The second byte : read register value function code
140 * 3rd and 4th bytes: start address of register to be read
141 * 5th and 6th bytes: Number of registers to read
142 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
143
144 (((
145
146
147
148 How to parse the reading of the return command of the parameter：
149
150 (% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
151 )))
152
153 * The first byte ARD: slave address code (=001～254)
154 * The second byte: Return to read function code
155 * 3rd byte: total number of bytes
156 * 4th～5th bytes: register data
157 * The 6th and 7th bytes: CRC16 checksum
158 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
159
160 (% class="wikigeneratedid" %)
161 (((
162
163
164
165
166 )))
167
168 === **1.3.3 How to configure RS485-LN and parse output commands** ===
169
170
171 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
172
173
174
175 ==== **1.3.3.1 via AT COMMAND** ====
176
177
178 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.
179
180 (((
181 If the configured parameters and commands are incorrect, the return value is not obtained.
182
183
184 )))
185
186 [[image:image-20220601143201-9.png]]
187
188 AT COMMAND
189
190
191 (% class="box infomessage" %)
192 (((
193 (% _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
194 )))
195
196 a:  length for the return of AT+COMMAND
197
198 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
199
200 c:  define the position for valid value.
201
202 [[image:image-20220601143115-8.png]]
203
204 AT COMMAND
205
206
207
208 PAYLOAD is available after the valid value is intercepted.
209
210
211 [[image:image-20220601143046-7.png]]
212
213 AT COMMAND
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215
216
217 You can get configured PAYLOAD on TTN.
218
219 [[image:image-20220601143519-1.png]]
220
221 (((
222 AT COMMAND
223 )))
224
225 (((
226
227
228
229 )))
230
231 (((
232 (% style="color:blue" %)**Example**:
233
234
235 (% style="color:red" %)**CMD1:**(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
236 )))
237
238 (((
239 RETURN1: 01 03 02 00 02 39 85 00 00(return data)
240 )))
241
242 (((
243 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.
244
245
246 )))
247
248 (((
249 (% style="color:red" %)**CMD2: **(%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
250 )))
251
252 (((
253 RETURN2: 01 03 02 08 DC BE 1D(return data)
254 )))
255
256 (((
257 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.
258
259
260 )))
261
262 (((
263 (% style="color:red" %)**CMD3:**(%%) Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
264 )))
265
266 (((
267 RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
268 )))
269
270 (((
271 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.
272 )))
273
274 (((
275 Payload: 01 00 02 39 85 08 DC 00 00 00 44
276
277
278 )))
279
280 [[image:image-20220601142936-6.png]]
281
282 AT COMMAND
283
284
285
286 (% 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.**
287
288
289 [[image:image-20220601143642-2.png]]
290
291 AT COMMAND
292
293
294
295 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
296
297
298 [[image:image-20220527093358-15.png]]
299
300 (((
301 DOWNLINK
302 )))
303
304 (((
305
306 )))
307
308 (((
309 (% style="color:blue" %)**Type Code 0xAF**
310 )))
311
312 (((
313 (% class="box infomessage" %)
314 (((
315 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
316 )))
317 )))
318
319 (((
320 (% style="color:red" %)**Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.**
321
322
323 )))
324
325 (((
326 Format: AF MM NN LL XX XX XX XX YY
327 )))
328
329 (((
330 Where:
331 )))
332
333 (((
334 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
335 )))
336
337 (((
338 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
339 )))
340
341 (((
342 LL: The length of AT+COMMAND or AT+DATACUT command
343 )))
344
345 (((
346 XX XX XX XX: AT+COMMAND or AT+DATACUT command
347 )))
348
349 (((
350 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
351 )))
352
353 (((
354 will execute an uplink after got this command.
355 )))
356
357 (((
358
359
360 (% style="color:blue" %)**Example:**
361 )))
362
363 (((
364 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
365 )))
366
367 [[image:image-20220601144149-6.png]]
368
369 DOWNLINK
370
371
372
373 [[image:image-20220601143803-3.png]]
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375 DOWNLINK
376
377
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379 [[image:image-20220601144053-5.png]]
380
381 DOWNLINK
382
383
384
385 [[image:image-20220601143921-4.png]]
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387 DOWNLINK
388
389
390
391 [[image:image-20220601142805-5.png]]
392
393 DOWNLINK
394
395
396
397 === **1.3.4 How to configure and output commands for RS485 to USB** ===
398
399
400 (((
401 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.
402 )))
403
404 (((
405 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
406 )))
407
408 (((
409 Open the serial port debugging, set the send and receive to HEX.
410 )))
411
412 (((
413 Baud rate: 9600
414 )))
415
416 (((
417 check digit: Even
418
419
420 )))
421
422 [[image:image-20220527093708-21.png]]
423
424 USB
425
426
427
428 [[image:image-20220527093747-22.png]]
429
430 USB
431
432
433
434 (((
435 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.
436
437
438 )))
439
440 (((
441 (% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
442 )))
443
444 (((
445 output：01 03 04 00 00 00 42 7A 02
446
447
448 )))
449
450 [[image:image-20220527093821-23.png]]
451
452 USB
453
454
455
456 === **1.3.5 How to configure multiple devices and modify device addresses** ===
457
458
459 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.
460
461 (((
462 (((
463 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
464 )))
465 )))
466
467 [[image:image-20220601142044-1.png]]
468
469
470 (% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
471
472
473 [[image:image-20220527093950-25.png]]
474
475
476 [[image:image-20220527094028-26.png]]
477
478
479 (((
480 (((
481 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.
482 )))
483 )))
484
485 (((
486 (((
487 We can use (% style="color:blue" %)**AT+CFGDEV**(%%) to set the device address.
488 )))
489 )))
490
491 (((
492 (((
493 We modify the device address 01 of the first energy meter to 02.
494 )))
495 )))
496
497 [[image:image-20220601142354-2.png]]
498
499
500 (% class="box infomessage" %)
501 (((
502 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
503 )))
504
505 * 01:device adaress
506
507 * 10:function code
508
509 * 00 61：Register address
510
511 * 00 01：Number of Registers
512
513 * 02：Number of bytes
514
515 * 00 02：Modified device address
516
517 * 1：Check code
518
519 The device address setting of the energy meter is complete.
520
521 Another energy meter is a single active energy meter with a floating-point format.
522
523 Its default device address is 01, and the following are the parameters for configuring two energy meters.
524
525 [[image:image-20220601142452-3.png]]
526
527
528 [[image:image-20220601142607-4.png]]
529
530
531 (% style="color:blue" %)**PAYLOAD: 01 08 DF 43 62**
532
533 * 08 DF is the valid value of the meter with device address 02.
534 * 43 62 is the valid value of the meter with device address 01.
535
536
537
538
539 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
540
541
542 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.
543
544 The structure is like below:
545
546 [[image:image-20220527094330-30.png]]
547
548 Connection
549
550
551 * 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"]]
552
553 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
554
555
556 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:
557
558 * 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);"]]
559 * 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"]]
560
561 == 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
562
563
564 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:
565
566 * 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);"]]
567
568 == 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
569
570
571 [[image:image-20220527094556-31.png]]
572
573 Network Structure
574
575
576 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]