Version 57.14 by Xiaoling on 2022/07/14 09:50
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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 Related documents:
33
34 * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
35 * [[Configure Manual>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : Explanation on how to integrate to Node-red and to the Mobile Phone, and with link to the Github code.
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 * 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/]]
56 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
57
58 == **1.3 Example3: Use RS485-LN with energy meters** ==
59
60 === **1.3.1 OverView** ===
61
62
63 (((
64 (% style="color:red" %)**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
65 )))
66
67 (((
68 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
69 )))
70
71 [[image:image-20220527092419-5.png]]
72
73 Connection1
74
75
76
77 (((
78 **How to connect with Energy Meter：**
79
80
81 )))
82
83 (((
84 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.
85 )))
86
87 (((
88 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
89 )))
90
91 (((
92 Power Source VIN to RS485-LN VIN+
93 )))
94
95 (((
96 Power Source GND to RS485-LN VIN-
97 )))
98
99 (((
100 Once there is power, the RS485-LN will be on.
101 )))
102
103 [[image:image-20220527092514-6.png]]
104
105 Connection2
106
107
108
109 [[image:image-20220527092555-7.png]]
110
111 Connection3
112
113
114 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
115
116
117 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.
118
119 [[image:image-20220601143257-10.png]]
120
121
122 (% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
123
124 * The first byte : slave address code (=001～247)
125 * The second byte : read register value function code
126 * 3rd and 4th bytes: start address of register to be read
127 * 5th and 6th bytes: Number of registers to read
128 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
129
130 (((
131
132
133
134 How to parse the reading of the return command of the parameter：
135
136 (% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
137 )))
138
139 * The first byte ARD: slave address code (=001～254)
140 * The second byte: Return to read function code
141 * 3rd byte: total number of bytes
142 * 4th～5th bytes: register data
143 * The 6th and 7th bytes: CRC16 checksum
144 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
145
146 (% class="wikigeneratedid" %)
147 (((
148
149
150
151
152 )))
153
154 === **1.3.3 How to configure RS485-LN and parse output commands** ===
155
156
157 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
158
159
160 ==== **1.3.3.1 via AT COMMAND** ====
161
162
163 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.
164
165 (((
166 If the configured parameters and commands are incorrect, the return value is not obtained.
167 )))
168
169 [[image:image-20220601143201-9.png]]
170
171 AT COMMAND
172
173
174 (% class="box infomessage" %)
175 (((
176 **AT+DATACUTx **:  This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
177 )))
178
179 a:  length for the return of AT+COMMAND
180
181 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
182
183 c:  define the position for valid value.
184
185 [[image:image-20220601143115-8.png]]
186
187 AT COMMAND
188
189
190
191 PAYLOAD is available after the valid value is intercepted.
192
193
194 [[image:image-20220601143046-7.png]]
195
196 AT COMMAND
197
198
199
200 You can get configured PAYLOAD on TTN.
201
202 [[image:image-20220601143519-1.png]]
203
204 (((
205 AT COMMAND
206 )))
207
208 (((
209
210 )))
211
212 (((
213 (% style="color:blue" %)**Example**:
214
215 CMD1: Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
216 )))
217
218 (((
219 RETURN1: 01 03 02 00 02 39 85 00 00(return data)
220 )))
221
222 (((
223 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.
224
225
226 )))
227
228 (((
229 CMD2: Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
230 )))
231
232 (((
233 RETURN2: 01 03 02 08 DC BE 1D(return data)
234 )))
235
236 (((
237 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.
238
239
240 )))
241
242 (((
243 CMD3: Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
244 )))
245
246 (((
247 RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
248 )))
249
250 (((
251 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.
252 )))
253
254 (((
255 Payload: 01 00 02 39 85 08 DC 00 00 00 44
256 )))
257
258 [[image:image-20220601142936-6.png]]
259
260 AT COMMAND
261
262
263 (% 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.**
264
265
266 [[image:image-20220601143642-2.png]]
267
268 AT COMMAND
269
270
271 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
272
273
274 [[image:image-20220527093358-15.png]]
275
276 (((
277 DOWNLINK
278 )))
279
280 (((
281
282 )))
283
284 (((
285 (% style="color:#4f81bd" %)**Type Code 0xAF**
286 )))
287
288 (((
289 (% class="box infomessage" %)
290 (((
291 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
292 )))
293 )))
294
295 (((
296 (% style="color:red" %)Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
297 )))
298
299 (((
300 Format: AF MM NN LL XX XX XX XX YY
301 )))
302
303 (((
304 Where:
305 )))
306
307 (((
308 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
309 )))
310
311 (((
312 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
313 )))
314
315 (((
316 LL: The length of AT+COMMAND or AT+DATACUT command
317 )))
318
319 (((
320 XX XX XX XX: AT+COMMAND or AT+DATACUT command
321 )))
322
323 (((
324 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
325 )))
326
327 (((
328 will execute an uplink after got this command.
329 )))
330
331 (((
332
333
334 (% style="color:blue" %)**Example:**
335 )))
336
337 (((
338 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
339 )))
340
341 [[image:image-20220601144149-6.png]]
342
343 DOWNLINK
344
345
346
347 [[image:image-20220601143803-3.png]]
348
349 DOWNLINK
350
351
352
353 [[image:image-20220601144053-5.png]]
354
355 DOWNLINK
356
357
358
359 [[image:image-20220601143921-4.png]]
360
361 DOWNLINK
362
363
364
365 [[image:image-20220601142805-5.png]]
366
367 DOWNLINK
368
369
370 === **1.3.4 How to configure and output commands for RS485 to USB** ===
371
372 (((
373 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.
374 )))
375
376 (((
377 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
378 )))
379
380 (((
381 Open the serial port debugging, set the send and receive to HEX.
382 )))
383
384 (((
385 Baud rate: 9600
386 )))
387
388 (((
389 check digit: Even
390
391
392 )))
393
394 [[image:image-20220527093708-21.png]]
395
396 USB
397
398
399
400 [[image:image-20220527093747-22.png]]
401
402 USB
403
404
405
406 (((
407 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.
408
409
410 )))
411
412 (((
413 (% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
414 )))
415
416 (((
417 output：01 03 04 00 00 00 42 7A 02
418
419
420 )))
421
422 [[image:image-20220527093821-23.png]]
423
424 USB
425
426
427 === **1.3.5 How to configure multiple devices and modify device addresses** ===
428
429
430 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.
431
432 (((
433 (((
434 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
435 )))
436 )))
437
438 [[image:image-20220601142044-1.png]]
439
440
441 (% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
442
443 [[image:image-20220527093950-25.png]]
444
445
446 [[image:image-20220527094028-26.png]]
447
448
449 (((
450 (((
451 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.
452 )))
453 )))
454
455 (((
456 (((
457 We can use **AT+CFGDEV** to set the device address.
458 )))
459 )))
460
461 (((
462 (((
463 We modify the device address 01 of the first energy meter to 02.
464 )))
465 )))
466
467 [[image:image-20220601142354-2.png]]
468
469
470 (% class="box infomessage" %)
471 (((
472 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
473 )))
474
475 * 01:device adaress
476
477 * 10:function code
478
479 * 00 61：Register address
480
481 * 00 01：Number of Registers
482
483 * 02：Number of bytes
484
485 * 00 02：Modified device address
486
487 * 1：Check code
488
489 The device address setting of the energy meter is complete.
490
491 Another energy meter is a single active energy meter with a floating-point format.
492
493 Its default device address is 01, and the following are the parameters for configuring two energy meters.
494
495 [[image:image-20220601142452-3.png]]
496
497
498 [[image:image-20220601142607-4.png]]
499
500
501 **PAYLOAD:01 08 DF 43 62**
502
503 * 08 DF is the valid value of the meter with device address 02.
504 * 43 62 is the valid value of the meter with device address 01.
505
506
507
508
509 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
510
511
512 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.
513
514 The structure is like below:
515
516 [[image:image-20220527094330-30.png]]
517
518 Connection
519
520
521 * 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/]]
522
523
524
525
526 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
527
528
529 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:
530
531 * 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);"]]
532 * 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]]
533
534
535
536
537 == 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
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 CEM C31 485-T1-MID and send the data for remote minitor. The structure is like below:
541
542 * 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);"]]
543
544
545
546
547 == 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
548
549
550 [[image:image-20220527094556-31.png]]
551
552 Network Structure
553
554
555 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]

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