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Version 41.14 by Xiaoling on 2022/06/01 14:12
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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 PAYLOAD is available after the valid value is intercepted.
186
187
188 [[image:image-20220527093059-11.png]]
189
190 AT COMMAND
191
192
193 You can get configured PAYLOAD on TTN.
194
195 [[image:image-20220527093133-12.png]]
196
197 (((
198 AT COMMAND
199 )))
200
201 (((
202
203 )))
204
205 (((
206 (% style="color:#4f81bd" %)**Example**:
207
208 CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
209 )))
210
211 (((
212 RETURN1:01 03 02 00 02 39 85 00 00(return data)
213 )))
214
215 (((
216 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.
217
218
219 )))
220
221 (((
222 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
223 )))
224
225 (((
226 RETURN2:01 03 02 08 DC BE 1D(return data)
227 )))
228
229 (((
230 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.
231
232
233 )))
234
235 (((
236 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
237 )))
238
239 (((
240 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
241 )))
242
243 (((
244 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.
245 )))
246
247 (((
248 Payload:01 00 02 39 85 08 DC 00 00 00 44
249 )))
250
251 [[image:image-20220527093204-13.png]]
252
253 AT COMMAND
254
255
256 (% 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.**
257
258 [[image:image-20220527093251-14.png]]
259
260 AT COMMAND
261
262
263 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
264
265 [[image:image-20220527093358-15.png]]
266
267 (((
268 DOWNLINK
269 )))
270
271 (((
272
273 )))
274
275 (((
276 (% style="color:#4f81bd" %)**Type Code 0xAF**
277 )))
278
279 (((
280 (% class="box infomessage" %)
281 (((
282 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
283 )))
284 )))
285
286 (((
287 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
288 )))
289
290 (((
291 Format: AF MM NN LL XX XX XX XX YY
292 )))
293
294 (((
295 Where:
296 )))
297
298 (((
299 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
300 )))
301
302 (((
303 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
304 )))
305
306 (((
307 LL: The length of AT+COMMAND or AT+DATACUT command
308 )))
309
310 (((
311 XX XX XX XX: AT+COMMAND or AT+DATACUT command
312 )))
313
314 (((
315 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
316 )))
317
318 (((
319 will execute an uplink after got this command.
320 )))
321
322 (((
323 (% style="color:#4f81bd" %)**Example:**
324 )))
325
326 (((
327 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
328 )))
329
330 [[image:image-20220527093430-16.png]]
331
332 DOWNLINK
333
334
335 [[image:image-20220527093508-17.png]]
336
337 DOWNLINK
338
339
340 [[image:image-20220527093530-18.png]]
341
342 DOWNLINK
343
344
345 [[image:image-20220527093607-19.png]]
346
347 DOWNLINK
348
349
350 [[image:image-20220527093628-20.png]]
351
352 DOWNLINK
353
354
355 === **1.3.4 How to configure and output commands for RS485 to USB** ===
356
357 (((
358 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.
359 )))
360
361 (((
362 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
363 )))
364
365 (((
366 Open the serial port debugging, set the send and receive to HEX.
367 )))
368
369 (((
370 Baud rate: 9600
371 )))
372
373 (((
374 check digit: Even
375 )))
376
377 [[image:image-20220527093708-21.png]]
378
379 USB
380
381
382 [[image:image-20220527093747-22.png]]
383
384 USB
385
386
387 (((
388 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.
389 )))
390
391 (((
392 (% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
393 )))
394
395 (((
396 output：01 03 04 00 00 00 42 7A 02
397 )))
398
399 [[image:image-20220527093821-23.png]]
400
401 USB
402
403
404 === **1.3.5 How to configure multiple devices and modify device addresses** ===
405
406 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.
407
408 (((
409 (((
410 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
411 )))
412 )))
413
414 [[image:image-20220527093849-24.png]]
415
416
417 **Example**:These two meters are examples of setting parameters and device addresses.
418
419 [[image:image-20220527093950-25.png]]
420
421 [[image:image-20220527094028-26.png]]
422
423 (((
424 (((
425 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.
426 )))
427 )))
428
429 (((
430 (((
431 We can use AT+CFGDEV to set the device address.
432 )))
433 )))
434
435 (((
436 (((
437 We modify the device address 01 of the first energy meter to 02.
438 )))
439 )))
440
441 [[image:image-20220527094100-27.png]]
442
443 (% class="box infomessage" %)
444 (((
445 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
446 )))
447
448 * 01:device adaress
449
450 * 10:function code
451
452 * 00 61：Register address
453
454 * 00 01：Number of Registers
455
456 * 02：Number of bytes
457
458 * 00 02：Modified device address
459
460 * 1：Check code
461
462 The device address setting of the energy meter is complete.
463
464 Another energy meter is a single active energy meter with a floating-point format.
465
466 Its default device address is 01, and the following are the parameters for configuring two energy meters.
467
468 [[image:image-20220527094150-28.png]]
469
470
471 [[image:image-20220527094224-29.png]]
472
473 **PAYLOAD:01 08 DF 43 62**
474
475 * 08 DF is the valid value of the meter with device address 02.
476 * 43 62 is the valid value of the meter with device address 01.
477
478
479 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
480
481 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:
482
483 [[image:image-20220527094330-30.png]]
484
485 Connection
486
487 * [[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
488
489
490 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
491
492 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:
493
494 * [[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
495
496 * [[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
497
498 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
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 CEM C31 485-T1-MID and send the data for remote minitor. The structure is like below:
501
502 * [[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
503
504 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
505
506 [[image:image-20220527094556-31.png]]
507
508 Network Structure
509
510 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]