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Version 57.7 by Xiaoling on 2022/07/14 09:20
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1 (% class="wikigeneratedid" %)
2 ** Table of** **Contents:**
3
4 {{toc/}}
5
6
7
8
9
10
11 = **1. Introduction** =
12
13
14 This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
15
16
17 == **1.1 Example 1: Connect to Leak relay and VFD** ==
18
19
20 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:
21
22 [[image:image-20220527091852-1.png]]
23
24 Connection
25
26
27
28 [[image:image-20220527091942-2.png]](% style="display:none" %)
29
30 Connection
31
32
33 Related documents:
34
35 * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
36 * [[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.
37 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
38
39
40
41
42 == **1.2 Example 2: Connect to Pulse Counter** ==
43
44
45 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:
46
47
48 [[image:image-20220527092058-3.png]]
49
50 Connection
51
52
53
54 [[image:image-20220527092146-4.png]]
55
56 Connection
57
58
59 * 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/]]
60 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
61
62
63
64
65 == **1.3 Example3: Use RS485-LN with energy meters** ==
66
67 === **1.3.1 OverView** ===
68
69 (((
70 **Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
71 )))
72
73 (((
74 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
75 )))
76
77 [[image:image-20220527092419-5.png]]
78
79 Connection1
80
81
82
83 (((
84 How to connect with Energy Meter：
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
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 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 (% class="box infomessage" %)
126 (((
127 **Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
128 )))
129
130 * The first byte : slave address code (=001～247)
131 * The second byte : read register value function code
132 * 3rd and 4th bytes: start address of register to be read
133 * 5th and 6th bytes: Number of registers to read
134 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
135
136 (((
137 How to parse the reading of the return command of the parameter：
138 )))
139
140 (% class="box infomessage" %)
141 (((
142 **Example:** RETURN1：01 03 02 08 FD 7E 05
143 )))
144
145 * The first byte ARD: slave address code (=001～254)
146 * The second byte: Return to read function code
147 * 3rd byte: total number of bytes
148 * 4th～5th bytes: register data
149 * The 6th and 7th bytes: CRC16 checksum
150 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
151
152 (% class="wikigeneratedid" %)
153 (((
154
155 )))
156
157 === **1.3.3 How to configure RS485-LN and parse output commands** ===
158
159 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
160
161
162 ==== **1.3.3.1 via AT COMMAND:** ====
163
164 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
165
166 (((
167 If the configured parameters and commands are incorrect, the return value is not obtained.
168 )))
169
170 [[image:image-20220601143201-9.png]]
171
172 AT COMMAND
173
174
175 (% class="box infomessage" %)
176 (((
177 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
178 )))
179
180 a:  length for the return of AT+COMMAND
181
182 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
183
184 c:  define the position for valid value.
185
186 [[image:image-20220601143115-8.png]]
187
188 AT COMMAND
189
190
191
192 PAYLOAD is available after the valid value is intercepted.
193
194
195 [[image:image-20220601143046-7.png]]
196
197 AT COMMAND
198
199
200
201 You can get configured PAYLOAD on TTN.
202
203 [[image:image-20220601143519-1.png]]
204
205 (((
206 AT COMMAND
207 )))
208
209 (((
210
211 )))
212
213 (((
214 (% style="color:#4f81bd" %)**Example**:
215
216 CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
217 )))
218
219 (((
220 RETURN1:01 03 02 00 02 39 85 00 00(return data)
221 )))
222
223 (((
224 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.
225
226
227 )))
228
229 (((
230 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
231 )))
232
233 (((
234 RETURN2:01 03 02 08 DC BE 1D(return data)
235 )))
236
237 (((
238 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.
239
240
241 )))
242
243 (((
244 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
245 )))
246
247 (((
248 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
249 )))
250
251 (((
252 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.
253 )))
254
255 (((
256 Payload:01 00 02 39 85 08 DC 00 00 00 44
257 )))
258
259 [[image:image-20220601142936-6.png]]
260
261 AT COMMAND
262
263
264 (% 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.**
265
266
267
268 [[image:image-20220601143642-2.png]]
269
270 AT COMMAND
271
272
273 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
274
275 [[image:image-20220527093358-15.png]]
276
277 (((
278 DOWNLINK
279 )))
280
281 (((
282
283 )))
284
285 (((
286 (% style="color:#4f81bd" %)**Type Code 0xAF**
287 )))
288
289 (((
290 (% class="box infomessage" %)
291 (((
292 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
293 )))
294 )))
295
296 (((
297 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
298 )))
299
300 (((
301 Format: AF MM NN LL XX XX XX XX YY
302 )))
303
304 (((
305 Where:
306 )))
307
308 (((
309 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
310 )))
311
312 (((
313 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
314 )))
315
316 (((
317 LL: The length of AT+COMMAND or AT+DATACUT command
318 )))
319
320 (((
321 XX XX XX XX: AT+COMMAND or AT+DATACUT command
322 )))
323
324 (((
325 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
326 )))
327
328 (((
329 will execute an uplink after got this command.
330 )))
331
332 (((
333
334
335 (% style="color:#4f81bd" %)**Example:**
336 )))
337
338 (((
339 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
340 )))
341
342 [[image:image-20220601144149-6.png]]
343
344 DOWNLINK
345
346
347
348 [[image:image-20220601143803-3.png]]
349
350 DOWNLINK
351
352
353
354 [[image:image-20220601144053-5.png]]
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356 DOWNLINK
357
358
359
360 [[image:image-20220601143921-4.png]]
361
362 DOWNLINK
363
364
365
366 [[image:image-20220601142805-5.png]]
367
368 DOWNLINK
369
370
371 === **1.3.4 How to configure and output commands for RS485 to USB** ===
372
373 (((
374 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.
375 )))
376
377 (((
378 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
379 )))
380
381 (((
382 Open the serial port debugging, set the send and receive to HEX.
383 )))
384
385 (((
386 Baud rate: 9600
387 )))
388
389 (((
390 check digit: Even
391 )))
392
393 [[image:image-20220527093708-21.png]]
394
395 USB
396
397
398
399 [[image:image-20220527093747-22.png]]
400
401 USB
402
403
404
405 (((
406 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.
407 )))
408
409 (((
410 (% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
411 )))
412
413 (((
414 output：01 03 04 00 00 00 42 7A 02
415 )))
416
417 [[image:image-20220527093821-23.png]]
418
419 USB
420
421
422 === **1.3.5 How to configure multiple devices and modify device addresses** ===
423
424 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.
425
426 (((
427 (((
428 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
429 )))
430 )))
431
432 [[image:image-20220601142044-1.png]]
433
434
435 **Example**:These two meters are examples of setting parameters and device addresses.
436
437 [[image:image-20220527093950-25.png]]
438
439
440 [[image:image-20220527094028-26.png]]
441
442 (((
443 (((
444 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.
445 )))
446 )))
447
448 (((
449 (((
450 We can use AT+CFGDEV to set the device address.
451 )))
452 )))
453
454 (((
455 (((
456 We modify the device address 01 of the first energy meter to 02.
457 )))
458 )))
459
460 [[image:image-20220601142354-2.png]]
461
462 (% class="box infomessage" %)
463 (((
464 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
465 )))
466
467 * 01:device adaress
468
469 * 10:function code
470
471 * 00 61：Register address
472
473 * 00 01：Number of Registers
474
475 * 02：Number of bytes
476
477 * 00 02：Modified device address
478
479 * 1：Check code
480
481 The device address setting of the energy meter is complete.
482
483 Another energy meter is a single active energy meter with a floating-point format.
484
485 Its default device address is 01, and the following are the parameters for configuring two energy meters.
486
487 [[image:image-20220601142452-3.png]]
488
489
490 [[image:image-20220601142607-4.png]]
491
492 **PAYLOAD:01 08 DF 43 62**
493
494 * 08 DF is the valid value of the meter with device address 02.
495 * 43 62 is the valid value of the meter with device address 01.
496
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/]]