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Version 57.20 by Xiaoling on 2022/07/14 10:10
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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
41 == **1.2 Example 2: Connect to Pulse Counter** ==
42
43
44 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:
45
46
47 [[image:image-20220527092058-3.png]]
48
49 Connection
50
51
52
53 [[image:image-20220527092146-4.png]]
54
55 Connection
56
57
58 (% style="color:blue" %)**Related documents:**
59
60 * 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/]]
61 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
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 [[image:image-20220527092555-7.png]]
117
118 Connection3
119
120
121 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
122
123
124 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.
125
126 [[image:image-20220601143257-10.png]]
127
128
129 (% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
130
131 * The first byte : slave address code (=001～247)
132 * The second byte : read register value function code
133 * 3rd and 4th bytes: start address of register to be read
134 * 5th and 6th bytes: Number of registers to read
135 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
136
137 (((
138
139
140
141 How to parse the reading of the return command of the parameter：
142
143 (% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
144 )))
145
146 * The first byte ARD: slave address code (=001～254)
147 * The second byte: Return to read function code
148 * 3rd byte: total number of bytes
149 * 4th～5th bytes: register data
150 * The 6th and 7th bytes: CRC16 checksum
151 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
152
153 (% class="wikigeneratedid" %)
154 (((
155
156
157
158
159 )))
160
161 === **1.3.3 How to configure RS485-LN and parse output commands** ===
162
163
164 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
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 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
279
280
281 [[image:image-20220527093358-15.png]]
282
283 (((
284 DOWNLINK
285 )))
286
287 (((
288
289 )))
290
291 (((
292 (% style="color:#4f81bd" %)**Type Code 0xAF**
293 )))
294
295 (((
296 (% class="box infomessage" %)
297 (((
298 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
299 )))
300 )))
301
302 (((
303 (% style="color:red" %)Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
304 )))
305
306 (((
307 Format: AF MM NN LL XX XX XX XX YY
308 )))
309
310 (((
311 Where:
312 )))
313
314 (((
315 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
316 )))
317
318 (((
319 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
320 )))
321
322 (((
323 LL: The length of AT+COMMAND or AT+DATACUT command
324 )))
325
326 (((
327 XX XX XX XX: AT+COMMAND or AT+DATACUT command
328 )))
329
330 (((
331 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
332 )))
333
334 (((
335 will execute an uplink after got this command.
336 )))
337
338 (((
339
340
341 (% style="color:blue" %)**Example:**
342 )))
343
344 (((
345 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
346 )))
347
348 [[image:image-20220601144149-6.png]]
349
350 DOWNLINK
351
352
353
354 [[image:image-20220601143803-3.png]]
355
356 DOWNLINK
357
358
359
360 [[image:image-20220601144053-5.png]]
361
362 DOWNLINK
363
364
365
366 [[image:image-20220601143921-4.png]]
367
368 DOWNLINK
369
370
371
372 [[image:image-20220601142805-5.png]]
373
374 DOWNLINK
375
376
377 === **1.3.4 How to configure and output commands for RS485 to USB** ===
378
379 (((
380 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.
381 )))
382
383 (((
384 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
385 )))
386
387 (((
388 Open the serial port debugging, set the send and receive to HEX.
389 )))
390
391 (((
392 Baud rate: 9600
393 )))
394
395 (((
396 check digit: Even
397
398
399 )))
400
401 [[image:image-20220527093708-21.png]]
402
403 USB
404
405
406
407 [[image:image-20220527093747-22.png]]
408
409 USB
410
411
412
413 (((
414 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.
415
416
417 )))
418
419 (((
420 (% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
421 )))
422
423 (((
424 output：01 03 04 00 00 00 42 7A 02
425
426
427 )))
428
429 [[image:image-20220527093821-23.png]]
430
431 USB
432
433
434 === **1.3.5 How to configure multiple devices and modify device addresses** ===
435
436
437 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.
438
439 (((
440 (((
441 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
442 )))
443 )))
444
445 [[image:image-20220601142044-1.png]]
446
447
448 (% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
449
450 [[image:image-20220527093950-25.png]]
451
452
453 [[image:image-20220527094028-26.png]]
454
455
456 (((
457 (((
458 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.
459 )))
460 )))
461
462 (((
463 (((
464 We can use **AT+CFGDEV** to set the device address.
465 )))
466 )))
467
468 (((
469 (((
470 We modify the device address 01 of the first energy meter to 02.
471 )))
472 )))
473
474 [[image:image-20220601142354-2.png]]
475
476
477 (% class="box infomessage" %)
478 (((
479 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
480 )))
481
482 * 01:device adaress
483
484 * 10:function code
485
486 * 00 61：Register address
487
488 * 00 01：Number of Registers
489
490 * 02：Number of bytes
491
492 * 00 02：Modified device address
493
494 * 1：Check code
495
496 The device address setting of the energy meter is complete.
497
498 Another energy meter is a single active energy meter with a floating-point format.
499
500 Its default device address is 01, and the following are the parameters for configuring two energy meters.
501
502 [[image:image-20220601142452-3.png]]
503
504
505 [[image:image-20220601142607-4.png]]
506
507
508 **PAYLOAD:01 08 DF 43 62**
509
510 * 08 DF is the valid value of the meter with device address 02.
511 * 43 62 is the valid value of the meter with device address 01.
512
513 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
514
515
516 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.
517
518 The structure is like below:
519
520 [[image:image-20220527094330-30.png]]
521
522 Connection
523
524
525 * 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/]]
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 == 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
536
537
538 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:
539
540 * 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);"]]
541
542 == 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
543
544
545 [[image:image-20220527094556-31.png]]
546
547 Network Structure
548
549
550 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]