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Version 57.19 by Xiaoling on 2022/07/14 10:09
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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 == **1.2 Example 2: Connect to Pulse Counter** ==
39
40
41 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:
42
43
44 [[image:image-20220527092058-3.png]]
45
46 Connection
47
48
49
50 [[image:image-20220527092146-4.png]]
51
52 Connection
53
54
55 (% style="color:blue" %)**Related documents:**
56
57 * 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/]]
58 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
59
60
61
62 == **1.3 Example3: Use RS485-LN with energy meters** ==
63
64
65 === **1.3.1 OverView** ===
66
67
68 (((
69 (% style="color:red" %)**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
70 )))
71
72 (((
73 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
74 )))
75
76 [[image:image-20220527092419-5.png]]
77
78 Connection1
79
80
81
82 (((
83 (% style="color:blue" %)**How to connect with Energy Meter：**
84
85
86 )))
87
88 (((
89 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.
90 )))
91
92 (((
93 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
94 )))
95
96 (((
97 Power Source VIN to RS485-LN VIN+
98 )))
99
100 (((
101 Power Source GND to RS485-LN VIN-
102 )))
103
104 (((
105 Once there is power, the RS485-LN will be on.
106 )))
107
108 [[image:image-20220527092514-6.png]]
109
110 Connection2
111
112
113 [[image:image-20220527092555-7.png]]
114
115 Connection3
116
117
118 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
119
120
121 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.
122
123 [[image:image-20220601143257-10.png]]
124
125
126 (% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
127
128 * The first byte : slave address code (=001～247)
129 * The second byte : read register value function code
130 * 3rd and 4th bytes: start address of register to be read
131 * 5th and 6th bytes: Number of registers to read
132 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
133
134 (((
135
136
137
138 How to parse the reading of the return command of the parameter：
139
140 (% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
141 )))
142
143 * The first byte ARD: slave address code (=001～254)
144 * The second byte: Return to read function code
145 * 3rd byte: total number of bytes
146 * 4th～5th bytes: register data
147 * The 6th and 7th bytes: CRC16 checksum
148 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
149
150 (% class="wikigeneratedid" %)
151 (((
152
153
154
155
156 )))
157
158 === **1.3.3 How to configure RS485-LN and parse output commands** ===
159
160
161 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
162
163
164 ==== **1.3.3.1 via AT COMMAND** ====
165
166
167 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.
168
169 (((
170 If the configured parameters and commands are incorrect, the return value is not obtained.
171 )))
172
173 [[image:image-20220601143201-9.png]]
174
175 AT COMMAND
176
177
178 (% class="box infomessage" %)
179 (((
180 **AT+DATACUTx **:  This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
181 )))
182
183 a:  length for the return of AT+COMMAND
184
185 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
186
187 c:  define the position for valid value.
188
189 [[image:image-20220601143115-8.png]]
190
191 AT COMMAND
192
193
194
195 PAYLOAD is available after the valid value is intercepted.
196
197
198 [[image:image-20220601143046-7.png]]
199
200 AT COMMAND
201
202
203
204 You can get configured PAYLOAD on TTN.
205
206 [[image:image-20220601143519-1.png]]
207
208 (((
209 AT COMMAND
210 )))
211
212 (((
213
214 )))
215
216 (((
217 (% style="color:blue" %)**Example**:
218
219 (% style="color:red" %)**CMD1:**(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
220 )))
221
222 (((
223 RETURN1: 01 03 02 00 02 39 85 00 00(return data)
224 )))
225
226 (((
227 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.
228
229
230 )))
231
232 (((
233 (% style="color:red" %)**CMD2: **(%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
234 )))
235
236 (((
237 RETURN2: 01 03 02 08 DC BE 1D(return data)
238 )))
239
240 (((
241 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.
242
243
244 )))
245
246 (((
247 (% style="color:red" %)**CMD3:**(%%) Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
248 )))
249
250 (((
251 RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
252 )))
253
254 (((
255 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.
256 )))
257
258 (((
259 Payload: 01 00 02 39 85 08 DC 00 00 00 44
260 )))
261
262 [[image:image-20220601142936-6.png]]
263
264 AT COMMAND
265
266
267 (% 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.**
268
269
270 [[image:image-20220601143642-2.png]]
271
272 AT COMMAND
273
274
275 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
276
277
278 [[image:image-20220527093358-15.png]]
279
280 (((
281 DOWNLINK
282 )))
283
284 (((
285
286 )))
287
288 (((
289 (% style="color:#4f81bd" %)**Type Code 0xAF**
290 )))
291
292 (((
293 (% class="box infomessage" %)
294 (((
295 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
296 )))
297 )))
298
299 (((
300 (% style="color:red" %)Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
301 )))
302
303 (((
304 Format: AF MM NN LL XX XX XX XX YY
305 )))
306
307 (((
308 Where:
309 )))
310
311 (((
312 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
313 )))
314
315 (((
316 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
317 )))
318
319 (((
320 LL: The length of AT+COMMAND or AT+DATACUT command
321 )))
322
323 (((
324 XX XX XX XX: AT+COMMAND or AT+DATACUT command
325 )))
326
327 (((
328 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
329 )))
330
331 (((
332 will execute an uplink after got this command.
333 )))
334
335 (((
336
337
338 (% style="color:blue" %)**Example:**
339 )))
340
341 (((
342 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
343 )))
344
345 [[image:image-20220601144149-6.png]]
346
347 DOWNLINK
348
349
350
351 [[image:image-20220601143803-3.png]]
352
353 DOWNLINK
354
355
356
357 [[image:image-20220601144053-5.png]]
358
359 DOWNLINK
360
361
362
363 [[image:image-20220601143921-4.png]]
364
365 DOWNLINK
366
367
368
369 [[image:image-20220601142805-5.png]]
370
371 DOWNLINK
372
373
374 === **1.3.4 How to configure and output commands for RS485 to USB** ===
375
376 (((
377 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.
378 )))
379
380 (((
381 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
382 )))
383
384 (((
385 Open the serial port debugging, set the send and receive to HEX.
386 )))
387
388 (((
389 Baud rate: 9600
390 )))
391
392 (((
393 check digit: Even
394
395
396 )))
397
398 [[image:image-20220527093708-21.png]]
399
400 USB
401
402
403
404 [[image:image-20220527093747-22.png]]
405
406 USB
407
408
409
410 (((
411 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.
412
413
414 )))
415
416 (((
417 (% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
418 )))
419
420 (((
421 output：01 03 04 00 00 00 42 7A 02
422
423
424 )))
425
426 [[image:image-20220527093821-23.png]]
427
428 USB
429
430
431 === **1.3.5 How to configure multiple devices and modify device addresses** ===
432
433
434 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.
435
436 (((
437 (((
438 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
439 )))
440 )))
441
442 [[image:image-20220601142044-1.png]]
443
444
445 (% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
446
447 [[image:image-20220527093950-25.png]]
448
449
450 [[image:image-20220527094028-26.png]]
451
452
453 (((
454 (((
455 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.
456 )))
457 )))
458
459 (((
460 (((
461 We can use **AT+CFGDEV** to set the device address.
462 )))
463 )))
464
465 (((
466 (((
467 We modify the device address 01 of the first energy meter to 02.
468 )))
469 )))
470
471 [[image:image-20220601142354-2.png]]
472
473
474 (% class="box infomessage" %)
475 (((
476 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
477 )))
478
479 * 01:device adaress
480
481 * 10:function code
482
483 * 00 61：Register address
484
485 * 00 01：Number of Registers
486
487 * 02：Number of bytes
488
489 * 00 02：Modified device address
490
491 * 1：Check code
492
493 The device address setting of the energy meter is complete.
494
495 Another energy meter is a single active energy meter with a floating-point format.
496
497 Its default device address is 01, and the following are the parameters for configuring two energy meters.
498
499 [[image:image-20220601142452-3.png]]
500
501
502 [[image:image-20220601142607-4.png]]
503
504
505 **PAYLOAD:01 08 DF 43 62**
506
507 * 08 DF is the valid value of the meter with device address 02.
508 * 43 62 is the valid value of the meter with device address 01.
509
510 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
511
512
513 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.
514
515 The structure is like below:
516
517 [[image:image-20220527094330-30.png]]
518
519 Connection
520
521
522 * 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/]]
523
524 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
525
526
527 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:
528
529 * 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);"]]
530 * 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]]
531
532 == 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with 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-LN to connect to CEM C31 485-T1-MID and send the data for remote minitor. The structure is like below:
536
537 * 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);"]]
538
539 == 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
540
541
542 [[image:image-20220527094556-31.png]]
543
544 Network Structure
545
546
547 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]