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Version 57.10 by Xiaoling on 2022/07/14 09:35
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1 (% class="wikigeneratedid" %)
2 *
3 ** Table of** **Contents:
4
5 {{toc/}}
6
7
8
9
10
11
12 = **1. Introduction** =
13
14
15 This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
16
17
18 == **1.1 Example 1: Connect to Leak relay and VFD** ==
19
20
21 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:
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 Related documents:
35
36 * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
37 * [[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.
38 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
39
40 == **1.2 Example 2: Connect to Pulse Counter** ==
41
42
43 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:
44
45
46 [[image:image-20220527092058-3.png]]
47
48 Connection
49
50
51
52 [[image:image-20220527092146-4.png]]
53
54 Connection
55
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 == **1.3 Example3: Use RS485-LN with energy meters** ==
61
62 === **1.3.1 OverView** ===
63
64
65 (((
66 (% style="color:red" %)**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
67 )))
68
69 (((
70 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
71 )))
72
73 [[image:image-20220527092419-5.png]]
74
75 Connection1
76
77
78
79 (((
80 **How to connect with Energy Meter：**
81
82
83 )))
84
85 (((
86 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.
87 )))
88
89 (((
90 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
91 )))
92
93 (((
94 Power Source VIN to RS485-LN VIN+
95 )))
96
97 (((
98 Power Source GND to RS485-LN VIN-
99 )))
100
101 (((
102 Once there is power, the RS485-LN will be on.
103 )))
104
105 [[image:image-20220527092514-6.png]]
106
107 Connection2
108
109
110
111 [[image:image-20220527092555-7.png]]
112
113 Connection3
114
115
116 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
117
118
119 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.
120
121 [[image:image-20220601143257-10.png]]
122
123
124 (% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
125
126 * The first byte : slave address code (=001～247)
127 * The second byte : read register value function code
128 * 3rd and 4th bytes: start address of register to be read
129 * 5th and 6th bytes: Number of registers to read
130 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
131
132 (((
133
134
135
136 How to parse the reading of the return command of the parameter：
137
138 (% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
139 )))
140
141 * The first byte ARD: slave address code (=001～254)
142 * The second byte: Return to read function code
143 * 3rd byte: total number of bytes
144 * 4th～5th bytes: register data
145 * The 6th and 7th bytes: CRC16 checksum
146 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
147
148 (% class="wikigeneratedid" %)
149 (((
150
151
152
153
154 )))
155
156 === **1.3.3 How to configure RS485-LN and parse output commands** ===
157
158
159 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
160
161
162 ==== **1.3.3.1 via AT COMMAND** ====
163
164
165 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.
166
167 (((
168 If the configured parameters and commands are incorrect, the return value is not obtained.
169 )))
170
171 [[image:image-20220601143201-9.png]]
172
173 AT COMMAND
174
175
176 (% class="box infomessage" %)
177 (((
178 **AT+DATACUTx **:  This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
179 )))
180
181 a:  length for the return of AT+COMMAND
182
183 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
184
185 c:  define the position for valid value.
186
187 [[image:image-20220601143115-8.png]]
188
189 AT COMMAND
190
191
192
193 PAYLOAD is available after the valid value is intercepted.
194
195
196 [[image:image-20220601143046-7.png]]
197
198 AT COMMAND
199
200
201
202 You can get configured PAYLOAD on TTN.
203
204 [[image:image-20220601143519-1.png]]
205
206 (((
207 AT COMMAND
208 )))
209
210 (((
211
212 )))
213
214 (((
215 (% style="color:blue" %)**Example**:
216
217 CMD1: Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
218 )))
219
220 (((
221 RETURN1: 01 03 02 00 02 39 85 00 00(return data)
222 )))
223
224 (((
225 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.
226
227
228 )))
229
230 (((
231 CMD2: Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
232 )))
233
234 (((
235 RETURN2: 01 03 02 08 DC BE 1D(return data)
236 )))
237
238 (((
239 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.
240
241
242 )))
243
244 (((
245 CMD3: Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
246 )))
247
248 (((
249 RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
250 )))
251
252 (((
253 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.
254 )))
255
256 (((
257 Payload: 01 00 02 39 85 08 DC 00 00 00 44
258 )))
259
260 [[image:image-20220601142936-6.png]]
261
262 AT COMMAND
263
264
265 (% 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.**
266
267
268 [[image:image-20220601143642-2.png]]
269
270 AT COMMAND
271
272
273 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
274
275
276 [[image:image-20220527093358-15.png]]
277
278 (((
279 DOWNLINK
280 )))
281
282 (((
283
284 )))
285
286 (((
287 (% style="color:#4f81bd" %)**Type Code 0xAF**
288 )))
289
290 (((
291 (% class="box infomessage" %)
292 (((
293 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
294 )))
295 )))
296
297 (((
298 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
299 )))
300
301 (((
302 Format: AF MM NN LL XX XX XX XX YY
303 )))
304
305 (((
306 Where:
307 )))
308
309 (((
310 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
311 )))
312
313 (((
314 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
315 )))
316
317 (((
318 LL: The length of AT+COMMAND or AT+DATACUT command
319 )))
320
321 (((
322 XX XX XX XX: AT+COMMAND or AT+DATACUT command
323 )))
324
325 (((
326 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
327 )))
328
329 (((
330 will execute an uplink after got this command.
331 )))
332
333 (((
334
335
336 (% style="color:#4f81bd" %)**Example:**
337 )))
338
339 (((
340 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
341 )))
342
343 [[image:image-20220601144149-6.png]]
344
345 DOWNLINK
346
347
348
349 [[image:image-20220601143803-3.png]]
350
351 DOWNLINK
352
353
354
355 [[image:image-20220601144053-5.png]]
356
357 DOWNLINK
358
359
360
361 [[image:image-20220601143921-4.png]]
362
363 DOWNLINK
364
365
366
367 [[image:image-20220601142805-5.png]]
368
369 DOWNLINK
370
371
372 === **1.3.4 How to configure and output commands for RS485 to USB** ===
373
374 (((
375 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.
376 )))
377
378 (((
379 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
380 )))
381
382 (((
383 Open the serial port debugging, set the send and receive to HEX.
384 )))
385
386 (((
387 Baud rate: 9600
388 )))
389
390 (((
391 check digit: Even
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 (% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
412 )))
413
414 (((
415 output：01 03 04 00 00 00 42 7A 02
416 )))
417
418 [[image:image-20220527093821-23.png]]
419
420 USB
421
422
423 === **1.3.5 How to configure multiple devices and modify device addresses** ===
424
425 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.
426
427 (((
428 (((
429 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
430 )))
431 )))
432
433 [[image:image-20220601142044-1.png]]
434
435
436 **Example**:These two meters are examples of setting parameters and device addresses.
437
438 [[image:image-20220527093950-25.png]]
439
440
441 [[image:image-20220527094028-26.png]]
442
443 (((
444 (((
445 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.
446 )))
447 )))
448
449 (((
450 (((
451 We can use AT+CFGDEV to set the device address.
452 )))
453 )))
454
455 (((
456 (((
457 We modify the device address 01 of the first energy meter to 02.
458 )))
459 )))
460
461 [[image:image-20220601142354-2.png]]
462
463 (% class="box infomessage" %)
464 (((
465 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
466 )))
467
468 * 01:device adaress
469
470 * 10:function code
471
472 * 00 61：Register address
473
474 * 00 01：Number of Registers
475
476 * 02：Number of bytes
477
478 * 00 02：Modified device address
479
480 * 1：Check code
481
482 The device address setting of the energy meter is complete.
483
484 Another energy meter is a single active energy meter with a floating-point format.
485
486 Its default device address is 01, and the following are the parameters for configuring two energy meters.
487
488 [[image:image-20220601142452-3.png]]
489
490
491 [[image:image-20220601142607-4.png]]
492
493 **PAYLOAD:01 08 DF 43 62**
494
495 * 08 DF is the valid value of the meter with device address 02.
496 * 43 62 is the valid value of the meter with device address 01.
497
498 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
499
500 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. The structure is like below:
501
502 [[image:image-20220527094330-30.png]]
503
504 Connection
505
506 * [[Circuit Breaker Remote Open Close>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Circuit_Breaker_Remote_Open_Close/]] : Configure Documen
507
508 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
509
510 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:
511
512 * [[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]] : Configure Document For RS485-BL
513
514 * [[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]] : Configure Document for RS485-LN
515
516 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
517
518 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:
519
520 * [[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]] : Configure Document For RS485-LN
521
522 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
523
524 [[image:image-20220527094556-31.png]]
525
526 Network Structure
527
528 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]