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Version 41.15 by Xiaoling on 2022/06/01 14:14
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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
39 == **1.2 Example 2: Connect to Pulse Counter** ==
40
41 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:
42
43 [[image:image-20220527092058-3.png]]
44
45 Connection
46
47
48
49 [[image:image-20220527092146-4.png]]
50
51 Connection
52
53
54 * [[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
55 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
56
57 == ==
58
59 == **1.3 Example3: Use RS485-LN with energy meters** ==
60
61 === **1.3.1 OverView** ===
62
63 (((
64 **Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
65 )))
66
67 (((
68 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
69 )))
70
71 [[image:image-20220527092419-5.png]]
72
73 Connection1
74
75
76
77 (((
78 How to connect with Energy Meter：
79 )))
80
81 (((
82 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.
83 )))
84
85 (((
86 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
87 )))
88
89 (((
90 Power Source VIN to RS485-LN VIN+
91 )))
92
93 (((
94 Power Source GND to RS485-LN VIN-
95 )))
96
97 (((
98 Once there is power, the RS485-LN will be on.
99 )))
100
101 [[image:image-20220527092514-6.png]]
102
103 Connection2
104
105
106
107 [[image:image-20220527092555-7.png]]
108
109 Connection3
110
111
112 === **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
113
114 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.
115
116 [[image:image-20220527092629-8.png]]
117
118
119 (% class="box infomessage" %)
120 (((
121 **Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
122 )))
123
124 * The first byte : slave address code (=001～247)
125 * The second byte : read register value function code
126 * 3rd and 4th bytes: start address of register to be read
127 * 5th and 6th bytes: Number of registers to read
128 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
129
130 (((
131 How to parse the reading of the return command of the parameter：
132 )))
133
134 (% class="box infomessage" %)
135 (((
136 **Example:** RETURN1：01 03 02 08 FD 7E 05
137 )))
138
139 * The first byte ARD: slave address code (=001～254)
140 * The second byte: Return to read function code
141 * 3rd byte: total number of bytes
142 * 4th～5th bytes: register data
143 * The 6th and 7th bytes: CRC16 checksum
144 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
145
146 (% class="wikigeneratedid" %)
147 (((
148
149 )))
150
151 === **1.3.3 How to configure RS485-LN and parse output commands** ===
152
153 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
154
155
156 ==== **1.3.3.1 via AT COMMAND:** ====
157
158 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
159
160 (((
161 If the configured parameters and commands are incorrect, the return value is not obtained.
162 )))
163
164 [[image:image-20220527092748-9.png]]
165
166 AT COMMAND
167
168
169 (% class="box infomessage" %)
170 (((
171 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
172 )))
173
174 a:  length for the return of AT+COMMAND
175
176 b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
177
178 c:  define the position for valid value.
179
180 [[image:image-20220527092936-10.png]]
181
182 AT COMMAND
183
184
185
186 PAYLOAD is available after the valid value is intercepted.
187
188
189 [[image:image-20220527093059-11.png]]
190
191 AT COMMAND
192
193
194 You can get configured PAYLOAD on TTN.
195
196 [[image:image-20220527093133-12.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-20220527093204-13.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 [[image:image-20220527093251-14.png]]
260
261 AT COMMAND
262
263
264 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
265
266 [[image:image-20220527093358-15.png]]
267
268 (((
269 DOWNLINK
270 )))
271
272 (((
273
274 )))
275
276 (((
277 (% style="color:#4f81bd" %)**Type Code 0xAF**
278 )))
279
280 (((
281 (% class="box infomessage" %)
282 (((
283 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
284 )))
285 )))
286
287 (((
288 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
289 )))
290
291 (((
292 Format: AF MM NN LL XX XX XX XX YY
293 )))
294
295 (((
296 Where:
297 )))
298
299 (((
300 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
301 )))
302
303 (((
304 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
305 )))
306
307 (((
308 LL: The length of AT+COMMAND or AT+DATACUT command
309 )))
310
311 (((
312 XX XX XX XX: AT+COMMAND or AT+DATACUT command
313 )))
314
315 (((
316 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
317 )))
318
319 (((
320 will execute an uplink after got this command.
321 )))
322
323 (((
324 (% style="color:#4f81bd" %)**Example:**
325 )))
326
327 (((
328 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
329 )))
330
331 [[image:image-20220527093430-16.png]]
332
333 DOWNLINK
334
335
336 [[image:image-20220527093508-17.png]]
337
338 DOWNLINK
339
340
341 [[image:image-20220527093530-18.png]]
342
343 DOWNLINK
344
345
346 [[image:image-20220527093607-19.png]]
347
348 DOWNLINK
349
350
351 [[image:image-20220527093628-20.png]]
352
353 DOWNLINK
354
355
356 === **1.3.4 How to configure and output commands for RS485 to USB** ===
357
358 (((
359 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.
360 )))
361
362 (((
363 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
364 )))
365
366 (((
367 Open the serial port debugging, set the send and receive to HEX.
368 )))
369
370 (((
371 Baud rate: 9600
372 )))
373
374 (((
375 check digit: Even
376 )))
377
378 [[image:image-20220527093708-21.png]]
379
380 USB
381
382
383 [[image:image-20220527093747-22.png]]
384
385 USB
386
387
388 (((
389 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.
390 )))
391
392 (((
393 (% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
394 )))
395
396 (((
397 output：01 03 04 00 00 00 42 7A 02
398 )))
399
400 [[image:image-20220527093821-23.png]]
401
402 USB
403
404
405 === **1.3.5 How to configure multiple devices and modify device addresses** ===
406
407 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.
408
409 (((
410 (((
411 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
412 )))
413 )))
414
415 [[image:image-20220527093849-24.png]]
416
417
418 **Example**:These two meters are examples of setting parameters and device addresses.
419
420 [[image:image-20220527093950-25.png]]
421
422 [[image:image-20220527094028-26.png]]
423
424 (((
425 (((
426 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.
427 )))
428 )))
429
430 (((
431 (((
432 We can use AT+CFGDEV to set the device address.
433 )))
434 )))
435
436 (((
437 (((
438 We modify the device address 01 of the first energy meter to 02.
439 )))
440 )))
441
442 [[image:image-20220527094100-27.png]]
443
444 (% class="box infomessage" %)
445 (((
446 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
447 )))
448
449 * 01:device adaress
450
451 * 10:function code
452
453 * 00 61：Register address
454
455 * 00 01：Number of Registers
456
457 * 02：Number of bytes
458
459 * 00 02：Modified device address
460
461 * 1：Check code
462
463 The device address setting of the energy meter is complete.
464
465 Another energy meter is a single active energy meter with a floating-point format.
466
467 Its default device address is 01, and the following are the parameters for configuring two energy meters.
468
469 [[image:image-20220527094150-28.png]]
470
471
472 [[image:image-20220527094224-29.png]]
473
474 **PAYLOAD:01 08 DF 43 62**
475
476 * 08 DF is the valid value of the meter with device address 02.
477 * 43 62 is the valid value of the meter with device address 01.
478
479
480 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
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-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:
483
484 [[image:image-20220527094330-30.png]]
485
486 Connection
487
488 * [[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
489
490
491 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
492
493 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:
494
495 * [[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
496
497 * [[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
498
499 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with 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-LN to connect to CEM C31 485-T1-MID and send the data for remote minitor. The structure is like below:
502
503 * [[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
504
505 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
506
507 [[image:image-20220527094556-31.png]]
508
509 Network Structure
510
511 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]