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Version 40.2 by Xiaoling on 2022/05/27 09:55
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1 (% class="wikigeneratedid" %)
2 **Contents:**
3
4 {{toc/}}
5
6 = 1. Introduction =
7
8 This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
9
10
11 == 1.1 Example 1: Connect to Leak relay and VFD ==
12
13 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:
14
15 [[image:image-20220527091852-1.png]]
16
17 Connection
18
19
20
21 [[image:image-20220527091942-2.png]](% style="display:none" %)
22
23 Connection
24
25
26 Related documents:
27
28 * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
29 * [[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.
30 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
31
32
33 == 1.2 Example 2: Connect to Pulse Counter ==
34
35 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:
36
37 [[image:image-20220527092058-3.png]]
38
39 Connection
40
41
42 [[image:image-20220527092146-4.png]]
43
44 Connection
45
46 * [[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
47 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
48
49 == ==
50
51 == 1.3 Example3: Use RS485-LN with energy meters ==
52
53 === 1.3.1 OverView ===
54
55 (((
56 **Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
57 )))
58
59 (((
60 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
61 )))
62
63 [[image:image-20220527092419-5.png]]
64
65 Connection1
66
67
68 (((
69 How to connect with Energy Meter：
70 )))
71
72 (((
73 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.
74 )))
75
76 (((
77 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
78 )))
79
80 (((
81 Power Source VIN to RS485-LN VIN+
82 )))
83
84 (((
85 Power Source GND to RS485-LN VIN-
86 )))
87
88 (((
89 Once there is power, the RS485-LN will be on.
90 )))
91
92 [[image:image-20220527092514-6.png]]
93
94 Connection2
95
96
97 [[image:image-20220527092555-7.png]]
98
99 Connection3
100
101
102 === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
103
104 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.
105
106 [[image:image-20220527092629-8.png]]
107
108
109 (% class="box infomessage" %)
110 (((
111 **Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
112 )))
113
114 * The first byte : slave address code (=001～247)
115 * The second byte : read register value function code
116 * 3rd and 4th bytes: start address of register to be read
117 * 5th and 6th bytes: Number of registers to read
118 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
119
120 (((
121 How to parse the reading of the return command of the parameter：
122 )))
123
124 (% class="box infomessage" %)
125 (((
126 **Example:** RETURN1：01 03 02 08 FD 7E 05
127 )))
128
129 * The first byte ARD: slave address code (=001～254)
130 * The second byte: Return to read function code
131 * 3rd byte: total number of bytes
132 * 4th～5th bytes: register data
133 * The 6th and 7th bytes: CRC16 checksum
134 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
135
136 (% class="wikigeneratedid" %)
137 (((
138
139 )))
140
141 === 1.3.3 How to configure RS485-LN and parse output commands ===
142
143 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
144
145
146 ==== 1.3.3.1 via AT COMMAND: ====
147
148 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
149
150 (((
151 If the configured parameters and commands are incorrect, the return value is not obtained.
152 )))
153
154 [[image:image-20220527092748-9.png]]
155
156 AT COMMAND
157
158
159 (% class="box infomessage" %)
160 (((
161 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
162 )))
163
164 a: length for the return of AT+COMMAND
165
166 b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
167
168 c: define the position for valid value.
169
170 [[image:image-20220527092936-10.png]]
171
172 AT COMMAND
173
174
175 PAYLOAD is available after the valid value is intercepted.
176
177
178 [[image:image-20220527093059-11.png]]
179
180 AT COMMAND
181
182
183 You can get configured PAYLOAD on TTN.
184
185 [[image:image-20220527093133-12.png]]
186
187 (((
188 AT COMMAND
189 )))
190
191 (((
192
193 )))
194
195 (((
196 (% style="color:#4f81bd" %)**Example**:
197
198 CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
199 )))
200
201 (((
202 RETURN1:01 03 02 00 02 39 85 00 00(return data)
203 )))
204
205 (((
206 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.
207
208
209 )))
210
211 (((
212 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
213 )))
214
215 (((
216 RETURN2:01 03 02 08 DC BE 1D(return data)
217 )))
218
219 (((
220 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.
221
222
223 )))
224
225 (((
226 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
227 )))
228
229 (((
230 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
231 )))
232
233 (((
234 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.
235 )))
236
237 (((
238 Payload:01 00 02 39 85 08 DC 00 00 00 44
239 )))
240
241 [[image:image-20220527093204-13.png]]
242
243 AT COMMAND
244
245
246 (% 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.**
247
248 [[image:image-20220527093251-14.png]]
249
250 AT COMMAND
251
252
253 ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
254
255 [[image:image-20220527093358-15.png]]
256
257 (((
258 DOWNLINK
259 )))
260
261 (((
262
263 )))
264
265 (((
266 (% style="color:#4f81bd" %)**Type Code 0xAF**
267 )))
268
269 (((
270 (% class="box infomessage" %)
271 (((
272 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
273 )))
274 )))
275
276 (((
277 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
278 )))
279
280 (((
281 Format: AF MM NN LL XX XX XX XX YY
282 )))
283
284 (((
285 Where:
286 )))
287
288 (((
289 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
290 )))
291
292 (((
293 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
294 )))
295
296 (((
297 LL: The length of AT+COMMAND or AT+DATACUT command
298 )))
299
300 (((
301 XX XX XX XX: AT+COMMAND or AT+DATACUT command
302 )))
303
304 (((
305 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
306 )))
307
308 (((
309 will execute an uplink after got this command.
310 )))
311
312 (((
313 (% style="color:#4f81bd" %)**Example:**
314 )))
315
316 (((
317 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
318 )))
319
320 [[image:image-20220527093430-16.png]]
321
322 DOWNLINK
323
324
325 [[image:image-20220527093508-17.png]]
326
327 DOWNLINK
328
329
330 [[image:image-20220527093530-18.png]]
331
332 DOWNLINK
333
334
335 [[image:image-20220527093607-19.png]]
336
337 DOWNLINK
338
339
340 [[image:image-20220527093628-20.png]]
341
342 DOWNLINK
343
344
345 === 1.3.4 How to configure and output commands for RS485 to USB ===
346
347 (((
348 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.
349 )))
350
351 (((
352 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
353 )))
354
355 (((
356 Open the serial port debugging, set the send and receive to HEX.
357 )))
358
359 (((
360 Baud rate: 9600
361 )))
362
363 (((
364 check digit: Even
365 )))
366
367 [[image:image-20220527093708-21.png]]
368
369 USB
370
371
372 [[image:image-20220527093747-22.png]]
373
374 USB
375
376
377 (((
378 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.
379 )))
380
381 (((
382 (% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
383 )))
384
385 (((
386 output：01 03 04 00 00 00 42 7A 02
387 )))
388
389 [[image:image-20220527093821-23.png]]
390
391 USB
392
393
394 === 1.3.5 How to configure multiple devices and modify device addresses ===
395
396 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.
397
398 (((
399 (((
400 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
401 )))
402 )))
403
404 [[image:image-20220527093849-24.png]]
405
406
407 **Example**:These two meters are examples of setting parameters and device addresses.
408
409 [[image:image-20220527093950-25.png]]
410
411 [[image:image-20220527094028-26.png]]
412
413 (((
414 (((
415 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.
416 )))
417 )))
418
419 (((
420 (((
421 We can use AT+CFGDEV to set the device address.
422 )))
423 )))
424
425 (((
426 (((
427 We modify the device address 01 of the first energy meter to 02.
428 )))
429 )))
430
431 [[image:image-20220527094100-27.png]]
432
433 (% class="box infomessage" %)
434 (((
435 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
436 )))
437
438 * 01:device adaress
439
440 * 10:function code
441
442 * 00 61：Register address
443
444 * 00 01：Number of Registers
445
446 * 02：Number of bytes
447
448 * 00 02：Modified device address
449
450 * 1：Check code
451
452 The device address setting of the energy meter is complete.
453
454 Another energy meter is a single active energy meter with a floating-point format.
455
456 Its default device address is 01, and the following are the parameters for configuring two energy meters.
457
458 [[image:image-20220527094150-28.png]]
459
460
461 [[image:image-20220527094224-29.png]]
462
463 **PAYLOAD:01 08 DF 43 62**
464
465 * 08 DF is the valid value of the meter with device address 02.
466 * 43 62 is the valid value of the meter with device address 01.
467
468
469 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
470
471 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:
472
473 [[image:image-20220527094330-30.png]]
474
475 Connection
476
477 * [[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
478
479
480 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
481
482 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:
483
484 * [[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
485
486 * [[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
487
488
489 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
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 CEM C31 485-T1-MID and send the data for remote minitor. The structure is like below:
492
493 * [[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
494
495
496 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
497
498 [[image:image-20220527094556-31.png]]
499
500 Network Structure
501
502 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]