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Version 57.18 by Xiaoling on 2022/07/14 10:03
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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 == **1.3 Example3: Use RS485-LN with energy meters** ==
62
63
64 === **1.3.1 OverView** ===
65
66
67 (((
68 (% style="color:red" %)**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
69 )))
70
71 (((
72 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
73 )))
74
75 [[image:image-20220527092419-5.png]]
76
77 Connection1
78
79
80
81 (((
82 (% style="color:blue" %)**How to connect with Energy Meter：**
83
84
85 )))
86
87 (((
88 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.
89 )))
90
91 (((
92 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
93 )))
94
95 (((
96 Power Source VIN to RS485-LN VIN+
97 )))
98
99 (((
100 Power Source GND to RS485-LN VIN-
101 )))
102
103 (((
104 Once there is power, the RS485-LN will be on.
105 )))
106
107 [[image:image-20220527092514-6.png]]
108
109 Connection2
110
111
112 [[image:image-20220527092555-7.png]]
113
114 Connection3
115
116
117 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
118
119
120 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.
121
122 [[image:image-20220601143257-10.png]]
123
124
125 (% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
126
127 * The first byte : slave address code (=001～247)
128 * The second byte : read register value function code
129 * 3rd and 4th bytes: start address of register to be read
130 * 5th and 6th bytes: Number of registers to read
131 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
132
133 (((
134
135
136
137 How to parse the reading of the return command of the parameter：
138
139 (% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
140 )))
141
142 * The first byte ARD: slave address code (=001～254)
143 * The second byte: Return to read function code
144 * 3rd byte: total number of bytes
145 * 4th～5th bytes: register data
146 * The 6th and 7th bytes: CRC16 checksum
147 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
148
149 (% class="wikigeneratedid" %)
150 (((
151
152
153
154
155 )))
156
157 === **1.3.3 How to configure RS485-LN and parse output commands** ===
158
159
160 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
161
162
163 ==== **1.3.3.1 via AT COMMAND** ====
164
165
166 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.
167
168 (((
169 If the configured parameters and commands are incorrect, the return value is not obtained.
170 )))
171
172 [[image:image-20220601143201-9.png]]
173
174 AT COMMAND
175
176
177 (% class="box infomessage" %)
178 (((
179 **AT+DATACUTx **:  This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
180 )))
181
182 a:  length for the return of AT+COMMAND
183
184 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
185
186 c:  define the position for valid value.
187
188 [[image:image-20220601143115-8.png]]
189
190 AT COMMAND
191
192
193
194 PAYLOAD is available after the valid value is intercepted.
195
196
197 [[image:image-20220601143046-7.png]]
198
199 AT COMMAND
200
201
202
203 You can get configured PAYLOAD on TTN.
204
205 [[image:image-20220601143519-1.png]]
206
207 (((
208 AT COMMAND
209 )))
210
211 (((
212
213 )))
214
215 (((
216 (% style="color:blue" %)**Example**:
217
218 (% style="color:red" %)**CMD1:**(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
219 )))
220
221 (((
222 RETURN1: 01 03 02 00 02 39 85 00 00(return data)
223 )))
224
225 (((
226 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.
227
228
229 )))
230
231 (((
232 (% style="color:red" %)**CMD2: **(%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
233 )))
234
235 (((
236 RETURN2: 01 03 02 08 DC BE 1D(return data)
237 )))
238
239 (((
240 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.
241
242
243 )))
244
245 (((
246 (% style="color:red" %)**CMD3:**(%%) Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
247 )))
248
249 (((
250 RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
251 )))
252
253 (((
254 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.
255 )))
256
257 (((
258 Payload: 01 00 02 39 85 08 DC 00 00 00 44
259 )))
260
261 [[image:image-20220601142936-6.png]]
262
263 AT COMMAND
264
265
266 (% 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.**
267
268
269 [[image:image-20220601143642-2.png]]
270
271 AT COMMAND
272
273
274 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
275
276
277 [[image:image-20220527093358-15.png]]
278
279 (((
280 DOWNLINK
281 )))
282
283 (((
284
285 )))
286
287 (((
288 (% style="color:#4f81bd" %)**Type Code 0xAF**
289 )))
290
291 (((
292 (% class="box infomessage" %)
293 (((
294 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
295 )))
296 )))
297
298 (((
299 (% style="color:red" %)Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
300 )))
301
302 (((
303 Format: AF MM NN LL XX XX XX XX YY
304 )))
305
306 (((
307 Where:
308 )))
309
310 (((
311 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
312 )))
313
314 (((
315 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
316 )))
317
318 (((
319 LL: The length of AT+COMMAND or AT+DATACUT command
320 )))
321
322 (((
323 XX XX XX XX: AT+COMMAND or AT+DATACUT command
324 )))
325
326 (((
327 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
328 )))
329
330 (((
331 will execute an uplink after got this command.
332 )))
333
334 (((
335
336
337 (% style="color:blue" %)**Example:**
338 )))
339
340 (((
341 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
342 )))
343
344 [[image:image-20220601144149-6.png]]
345
346 DOWNLINK
347
348
349
350 [[image:image-20220601143803-3.png]]
351
352 DOWNLINK
353
354
355
356 [[image:image-20220601144053-5.png]]
357
358 DOWNLINK
359
360
361
362 [[image:image-20220601143921-4.png]]
363
364 DOWNLINK
365
366
367
368 [[image:image-20220601142805-5.png]]
369
370 DOWNLINK
371
372
373 === **1.3.4 How to configure and output commands for RS485 to USB** ===
374
375 (((
376 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.
377 )))
378
379 (((
380 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
381 )))
382
383 (((
384 Open the serial port debugging, set the send and receive to HEX.
385 )))
386
387 (((
388 Baud rate: 9600
389 )))
390
391 (((
392 check digit: Even
393
394
395 )))
396
397 [[image:image-20220527093708-21.png]]
398
399 USB
400
401
402
403 [[image:image-20220527093747-22.png]]
404
405 USB
406
407
408
409 (((
410 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.
411
412
413 )))
414
415 (((
416 (% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
417 )))
418
419 (((
420 output：01 03 04 00 00 00 42 7A 02
421
422
423 )))
424
425 [[image:image-20220527093821-23.png]]
426
427 USB
428
429
430 === **1.3.5 How to configure multiple devices and modify device addresses** ===
431
432
433 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.
434
435 (((
436 (((
437 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
438 )))
439 )))
440
441 [[image:image-20220601142044-1.png]]
442
443
444 (% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
445
446 [[image:image-20220527093950-25.png]]
447
448
449 [[image:image-20220527094028-26.png]]
450
451
452 (((
453 (((
454 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.
455 )))
456 )))
457
458 (((
459 (((
460 We can use **AT+CFGDEV** to set the device address.
461 )))
462 )))
463
464 (((
465 (((
466 We modify the device address 01 of the first energy meter to 02.
467 )))
468 )))
469
470 [[image:image-20220601142354-2.png]]
471
472
473 (% class="box infomessage" %)
474 (((
475 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
476 )))
477
478 * 01:device adaress
479
480 * 10:function code
481
482 * 00 61：Register address
483
484 * 00 01：Number of Registers
485
486 * 02：Number of bytes
487
488 * 00 02：Modified device address
489
490 * 1：Check code
491
492 The device address setting of the energy meter is complete.
493
494 Another energy meter is a single active energy meter with a floating-point format.
495
496 Its default device address is 01, and the following are the parameters for configuring two energy meters.
497
498 [[image:image-20220601142452-3.png]]
499
500
501 [[image:image-20220601142607-4.png]]
502
503
504 **PAYLOAD:01 08 DF 43 62**
505
506 * 08 DF is the valid value of the meter with device address 02.
507 * 43 62 is the valid value of the meter with device address 01.
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 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
524
525
526 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:
527
528 * 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);"]]
529 * 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]]
530
531 == 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
532
533
534 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:
535
536 * 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);"]]
537
538 == 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
539
540
541 [[image:image-20220527094556-31.png]]
542
543 Network Structure
544
545
546 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]