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Version 57.6 by Xiaoling on 2022/07/14 09:16
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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 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:
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 * [[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/]] : Configure Document
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 === **1.3.1 OverView** ===
65
66 (((
67 **Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
68 )))
69
70 (((
71 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
72 )))
73
74 [[image:image-20220527092419-5.png]]
75
76 Connection1
77
78
79
80 (((
81 How to connect with Energy Meter：
82 )))
83
84 (((
85 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.
86 )))
87
88 (((
89 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
90 )))
91
92 (((
93 Power Source VIN to RS485-LN VIN+
94 )))
95
96 (((
97 Power Source GND to RS485-LN VIN-
98 )))
99
100 (((
101 Once there is power, the RS485-LN will be on.
102 )))
103
104 [[image:image-20220527092514-6.png]]
105
106 Connection2
107
108
109
110 [[image:image-20220527092555-7.png]]
111
112 Connection3
113
114
115 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
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 (% class="box infomessage" %)
123 (((
124 **Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
125 )))
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 How to parse the reading of the return command of the parameter：
135 )))
136
137 (% class="box infomessage" %)
138 (((
139 **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 === **1.3.3 How to configure RS485-LN and parse output commands** ===
155
156 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
157
158
159 ==== **1.3.3.1 via AT COMMAND:** ====
160
161 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
162
163 (((
164 If the configured parameters and commands are incorrect, the return value is not obtained.
165 )))
166
167 [[image:image-20220601143201-9.png]]
168
169 AT COMMAND
170
171
172 (% class="box infomessage" %)
173 (((
174 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
175 )))
176
177 a:  length for the return of AT+COMMAND
178
179 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
180
181 c:  define the position for valid value.
182
183 [[image:image-20220601143115-8.png]]
184
185 AT COMMAND
186
187
188
189 PAYLOAD is available after the valid value is intercepted.
190
191
192 [[image:image-20220601143046-7.png]]
193
194 AT COMMAND
195
196
197
198 You can get configured PAYLOAD on TTN.
199
200 [[image:image-20220601143519-1.png]]
201
202 (((
203 AT COMMAND
204 )))
205
206 (((
207
208 )))
209
210 (((
211 (% style="color:#4f81bd" %)**Example**:
212
213 CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
214 )))
215
216 (((
217 RETURN1:01 03 02 00 02 39 85 00 00(return data)
218 )))
219
220 (((
221 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.
222
223
224 )))
225
226 (((
227 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
228 )))
229
230 (((
231 RETURN2:01 03 02 08 DC BE 1D(return data)
232 )))
233
234 (((
235 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.
236
237
238 )))
239
240 (((
241 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
242 )))
243
244 (((
245 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
246 )))
247
248 (((
249 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.
250 )))
251
252 (((
253 Payload:01 00 02 39 85 08 DC 00 00 00 44
254 )))
255
256 [[image:image-20220601142936-6.png]]
257
258 AT COMMAND
259
260
261 (% 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.**
262
263
264
265 [[image:image-20220601143642-2.png]]
266
267 AT COMMAND
268
269
270 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
271
272 [[image:image-20220527093358-15.png]]
273
274 (((
275 DOWNLINK
276 )))
277
278 (((
279
280 )))
281
282 (((
283 (% style="color:#4f81bd" %)**Type Code 0xAF**
284 )))
285
286 (((
287 (% class="box infomessage" %)
288 (((
289 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
290 )))
291 )))
292
293 (((
294 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
295 )))
296
297 (((
298 Format: AF MM NN LL XX XX XX XX YY
299 )))
300
301 (((
302 Where:
303 )))
304
305 (((
306 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
307 )))
308
309 (((
310 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
311 )))
312
313 (((
314 LL: The length of AT+COMMAND or AT+DATACUT command
315 )))
316
317 (((
318 XX XX XX XX: AT+COMMAND or AT+DATACUT command
319 )))
320
321 (((
322 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
323 )))
324
325 (((
326 will execute an uplink after got this command.
327 )))
328
329 (((
330
331
332 (% style="color:#4f81bd" %)**Example:**
333 )))
334
335 (((
336 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
337 )))
338
339 [[image:image-20220601144149-6.png]]
340
341 DOWNLINK
342
343
344
345 [[image:image-20220601143803-3.png]]
346
347 DOWNLINK
348
349
350
351 [[image:image-20220601144053-5.png]]
352
353 DOWNLINK
354
355
356
357 [[image:image-20220601143921-4.png]]
358
359 DOWNLINK
360
361
362
363 [[image:image-20220601142805-5.png]]
364
365 DOWNLINK
366
367
368 === **1.3.4 How to configure and output commands for RS485 to USB** ===
369
370 (((
371 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.
372 )))
373
374 (((
375 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
376 )))
377
378 (((
379 Open the serial port debugging, set the send and receive to HEX.
380 )))
381
382 (((
383 Baud rate: 9600
384 )))
385
386 (((
387 check digit: Even
388 )))
389
390 [[image:image-20220527093708-21.png]]
391
392 USB
393
394
395
396 [[image:image-20220527093747-22.png]]
397
398 USB
399
400
401
402 (((
403 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.
404 )))
405
406 (((
407 (% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
408 )))
409
410 (((
411 output：01 03 04 00 00 00 42 7A 02
412 )))
413
414 [[image:image-20220527093821-23.png]]
415
416 USB
417
418
419 === **1.3.5 How to configure multiple devices and modify device addresses** ===
420
421 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.
422
423 (((
424 (((
425 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
426 )))
427 )))
428
429 [[image:image-20220601142044-1.png]]
430
431
432 **Example**:These two meters are examples of setting parameters and device addresses.
433
434 [[image:image-20220527093950-25.png]]
435
436
437 [[image:image-20220527094028-26.png]]
438
439 (((
440 (((
441 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.
442 )))
443 )))
444
445 (((
446 (((
447 We can use AT+CFGDEV to set the device address.
448 )))
449 )))
450
451 (((
452 (((
453 We modify the device address 01 of the first energy meter to 02.
454 )))
455 )))
456
457 [[image:image-20220601142354-2.png]]
458
459 (% class="box infomessage" %)
460 (((
461 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
462 )))
463
464 * 01:device adaress
465
466 * 10:function code
467
468 * 00 61：Register address
469
470 * 00 01：Number of Registers
471
472 * 02：Number of bytes
473
474 * 00 02：Modified device address
475
476 * 1：Check code
477
478 The device address setting of the energy meter is complete.
479
480 Another energy meter is a single active energy meter with a floating-point format.
481
482 Its default device address is 01, and the following are the parameters for configuring two energy meters.
483
484 [[image:image-20220601142452-3.png]]
485
486
487 [[image:image-20220601142607-4.png]]
488
489 **PAYLOAD:01 08 DF 43 62**
490
491 * 08 DF is the valid value of the meter with device address 02.
492 * 43 62 is the valid value of the meter with device address 01.
493
494
495 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
496
497 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:
498
499 [[image:image-20220527094330-30.png]]
500
501 Connection
502
503 * [[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
504
505 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
506
507 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:
508
509 * [[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
510
511 * [[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
512
513 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
514
515 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:
516
517 * [[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
518
519 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
520
521 [[image:image-20220527094556-31.png]]
522
523 Network Structure
524
525 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]