Version 52.2 by Xiaoling on 2022/06/01 14:35
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1 (% class="wikigeneratedid" %)
2 **Contents:**
3
4 {{toc/}}
5
6
7
8
9
10
11 = **1. Introduction** =
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 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:
19
20 [[image:image-20220527091852-1.png]]
21
22 Connection
23
24
25
26 [[image:image-20220527091942-2.png]](% style="display:none" %)
27
28 Connection
29
30
31 Related documents:
32
33 * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
34 * [[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.
35 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
36
37
38 == **1.2 Example 2: Connect to Pulse Counter** ==
39
40 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:
41
42 [[image:image-20220527092058-3.png]]
43
44 Connection
45
46
47
48 [[image:image-20220527092146-4.png]]
49
50 Connection
51
52
53 * [[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
54 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
55
56 == ==
57
58 == **1.3 Example3: Use RS485-LN with energy meters** ==
59
60 === **1.3.1 OverView** ===
61
62 (((
63 **Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
64 )))
65
66 (((
67 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
68 )))
69
70 [[image:image-20220527092419-5.png]]
71
72 Connection1
73
74
75
76 (((
77 How to connect with Energy Meter：
78 )))
79
80 (((
81 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.
82 )))
83
84 (((
85 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
86 )))
87
88 (((
89 Power Source VIN to RS485-LN VIN+
90 )))
91
92 (((
93 Power Source GND to RS485-LN VIN-
94 )))
95
96 (((
97 Once there is power, the RS485-LN will be on.
98 )))
99
100 [[image:image-20220527092514-6.png]]
101
102 Connection2
103
104
105
106 [[image:image-20220527092555-7.png]]
107
108 Connection3
109
110
111 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
112
113 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.
114
115 [[image:image-20220601143257-10.png]]
116
117
118 (% class="box infomessage" %)
119 (((
120 **Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
121 )))
122
123 * The first byte : slave address code (=001～247)
124 * The second byte : read register value function code
125 * 3rd and 4th bytes: start address of register to be read
126 * 5th and 6th bytes: Number of registers to read
127 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
128
129 (((
130 How to parse the reading of the return command of the parameter：
131 )))
132
133 (% class="box infomessage" %)
134 (((
135 **Example:** RETURN1：01 03 02 08 FD 7E 05
136 )))
137
138 * The first byte ARD: slave address code (=001～254)
139 * The second byte: Return to read function code
140 * 3rd byte: total number of bytes
141 * 4th～5th bytes: register data
142 * The 6th and 7th bytes: CRC16 checksum
143 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
144
145 (% class="wikigeneratedid" %)
146 (((
147
148 )))
149
150 === **1.3.3 How to configure RS485-LN and parse output commands** ===
151
152 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
153
154
155 ==== **1.3.3.1 via AT COMMAND:** ====
156
157 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
158
159 (((
160 If the configured parameters and commands are incorrect, the return value is not obtained.
161 )))
162
163 [[image:image-20220601143201-9.png]]
164
165 AT COMMAND
166
167
168 (% class="box infomessage" %)
169 (((
170 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
171 )))
172
173 a:  length for the return of AT+COMMAND
174
175 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
176
177 c:  define the position for valid value.
178
179 [[image:image-20220601143115-8.png]]
180
181 AT COMMAND
182
183
184
185 PAYLOAD is available after the valid value is intercepted.
186
187
188 [[image:image-20220601143046-7.png]]
189
190 AT COMMAND
191
192
193
194 You can get configured PAYLOAD on TTN.
195
196 [[image:image-20220601143519-1.png]]
197
198 (((
199 AT COMMAND
200 )))
201
202 (((
203
204 )))
205
206 (((
207 (% style="color:#4f81bd" %)**Example**:
208
209 CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
210 )))
211
212 (((
213 RETURN1:01 03 02 00 02 39 85 00 00(return data)
214 )))
215
216 (((
217 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.
218
219
220 )))
221
222 (((
223 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
224 )))
225
226 (((
227 RETURN2:01 03 02 08 DC BE 1D(return data)
228 )))
229
230 (((
231 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.
232
233
234 )))
235
236 (((
237 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
238 )))
239
240 (((
241 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
242 )))
243
244 (((
245 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.
246 )))
247
248 (((
249 Payload:01 00 02 39 85 08 DC 00 00 00 44
250 )))
251
252 [[image:image-20220601142936-6.png]]
253
254 AT COMMAND
255
256
257 (% 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.**
258
259
260
261 [[image:image-20220527093251-14.png]]
262
263 AT COMMAND
264
265
266 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
267
268 [[image:image-20220527093358-15.png]]
269
270 (((
271 DOWNLINK
272 )))
273
274 (((
275
276 )))
277
278 (((
279 (% style="color:#4f81bd" %)**Type Code 0xAF**
280 )))
281
282 (((
283 (% class="box infomessage" %)
284 (((
285 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
286 )))
287 )))
288
289 (((
290 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
291 )))
292
293 (((
294 Format: AF MM NN LL XX XX XX XX YY
295 )))
296
297 (((
298 Where:
299 )))
300
301 (((
302 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
303 )))
304
305 (((
306 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
307 )))
308
309 (((
310 LL: The length of AT+COMMAND or AT+DATACUT command
311 )))
312
313 (((
314 XX XX XX XX: AT+COMMAND or AT+DATACUT command
315 )))
316
317 (((
318 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
319 )))
320
321 (((
322 will execute an uplink after got this command.
323 )))
324
325 (((
326
327
328 (% style="color:#4f81bd" %)**Example:**
329 )))
330
331 (((
332 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
333 )))
334
335 [[image:image-20220527093430-16.png]]
336
337 DOWNLINK
338
339
340
341 [[image:image-20220527093508-17.png]]
342
343 DOWNLINK
344
345
346
347 [[image:image-20220527093530-18.png]]
348
349 DOWNLINK
350
351
352
353 [[image:image-20220527093607-19.png]]
354
355 DOWNLINK
356
357
358
359 [[image:image-20220601142805-5.png]]
360
361 DOWNLINK
362
363
364 === **1.3.4 How to configure and output commands for RS485 to USB** ===
365
366 (((
367 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.
368 )))
369
370 (((
371 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
372 )))
373
374 (((
375 Open the serial port debugging, set the send and receive to HEX.
376 )))
377
378 (((
379 Baud rate: 9600
380 )))
381
382 (((
383 check digit: Even
384 )))
385
386 [[image:image-20220527093708-21.png]]
387
388 USB
389
390
391
392 [[image:image-20220527093747-22.png]]
393
394 USB
395
396
397
398 (((
399 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.
400 )))
401
402 (((
403 (% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
404 )))
405
406 (((
407 output：01 03 04 00 00 00 42 7A 02
408 )))
409
410 [[image:image-20220527093821-23.png]]
411
412 USB
413
414
415 === **1.3.5 How to configure multiple devices and modify device addresses** ===
416
417 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.
418
419 (((
420 (((
421 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
422 )))
423 )))
424
425 [[image:image-20220601142044-1.png]]
426
427
428 **Example**:These two meters are examples of setting parameters and device addresses.
429
430 [[image:image-20220527093950-25.png]]
431
432 [[image:image-20220527094028-26.png]]
433
434 (((
435 (((
436 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.
437 )))
438 )))
439
440 (((
441 (((
442 We can use AT+CFGDEV to set the device address.
443 )))
444 )))
445
446 (((
447 (((
448 We modify the device address 01 of the first energy meter to 02.
449 )))
450 )))
451
452 [[image:image-20220601142354-2.png]]
453
454 (% class="box infomessage" %)
455 (((
456 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
457 )))
458
459 * 01:device adaress
460
461 * 10:function code
462
463 * 00 61：Register address
464
465 * 00 01：Number of Registers
466
467 * 02：Number of bytes
468
469 * 00 02：Modified device address
470
471 * 1：Check code
472
473 The device address setting of the energy meter is complete.
474
475 Another energy meter is a single active energy meter with a floating-point format.
476
477 Its default device address is 01, and the following are the parameters for configuring two energy meters.
478
479 [[image:image-20220601142452-3.png]]
480
481
482 [[image:image-20220601142607-4.png]]
483
484 **PAYLOAD:01 08 DF 43 62**
485
486 * 08 DF is the valid value of the meter with device address 02.
487 * 43 62 is the valid value of the meter with device address 01.
488
489 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
490
491 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:
492
493 [[image:image-20220527094330-30.png]]
494
495 Connection
496
497 * [[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
498
499 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
500
501 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:
502
503 * [[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
504
505 * [[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
506
507
508 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with 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-LN to connect to CEM C31 485-T1-MID and send the data for remote minitor. The structure is like below:
511
512 * [[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
513
514
515 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
516
517 [[image:image-20220527094556-31.png]]
518
519 Network Structure
520
521 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]

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