Skip to Content
Version 41.5 by Xiaoling on 2022/05/30 11:25
Show last authors
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 == 1.2 Example 2: Connect to Pulse Counter ==
38
39 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:
40
41 [[image:image-20220527092058-3.png]]
42
43 Connection
44
45
46 [[image:image-20220527092146-4.png]]
47
48 Connection
49
50 * [[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
51 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
52
53 == ==
54
55 == 1.3 Example3: Use RS485-LN with energy meters ==
56
57 === 1.3.1 OverView ===
58
59 (((
60 **Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
61 )))
62
63 (((
64 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
65 )))
66
67 [[image:image-20220527092419-5.png]]
68
69 Connection1
70
71
72 (((
73 How to connect with Energy Meter：
74 )))
75
76 (((
77 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.
78 )))
79
80 (((
81 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
82 )))
83
84 (((
85 Power Source VIN to RS485-LN VIN+
86 )))
87
88 (((
89 Power Source GND to RS485-LN VIN-
90 )))
91
92 (((
93 Once there is power, the RS485-LN will be on.
94 )))
95
96 [[image:image-20220527092514-6.png]]
97
98 Connection2
99
100
101 [[image:image-20220527092555-7.png]]
102
103 Connection3
104
105
106 === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
107
108 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.
109
110 [[image:image-20220527092629-8.png]]
111
112
113 (% class="box infomessage" %)
114 (((
115 **Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
116 )))
117
118 * The first byte : slave address code (=001～247)
119 * The second byte : read register value function code
120 * 3rd and 4th bytes: start address of register to be read
121 * 5th and 6th bytes: Number of registers to read
122 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
123
124 (((
125 How to parse the reading of the return command of the parameter：
126 )))
127
128 (% class="box infomessage" %)
129 (((
130 **Example:** RETURN1：01 03 02 08 FD 7E 05
131 )))
132
133 * The first byte ARD: slave address code (=001～254)
134 * The second byte: Return to read function code
135 * 3rd byte: total number of bytes
136 * 4th～5th bytes: register data
137 * The 6th and 7th bytes: CRC16 checksum
138 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
139
140 (% class="wikigeneratedid" %)
141 (((
142
143 )))
144
145 === **1.3.3 How to configure RS485-LN and parse output commands** ===
146
147 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
148
149
150 ==== **1.3.3.1 via AT COMMAND:** ====
151
152 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
153
154 (((
155 If the configured parameters and commands are incorrect, the return value is not obtained.
156 )))
157
158 [[image:image-20220527092748-9.png]]
159
160 AT COMMAND
161
162
163 (% class="box infomessage" %)
164 (((
165 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
166 )))
167
168 a: length for the return of AT+COMMAND
169
170 b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
171
172 c: define the position for valid value.
173
174 [[image:image-20220527092936-10.png]]
175
176 AT COMMAND
177
178
179 PAYLOAD is available after the valid value is intercepted.
180
181
182 [[image:image-20220527093059-11.png]]
183
184 AT COMMAND
185
186
187 You can get configured PAYLOAD on TTN.
188
189 [[image:image-20220527093133-12.png]]
190
191 (((
192 AT COMMAND
193 )))
194
195 (((
196
197 )))
198
199 (((
200 (% style="color:#4f81bd" %)**Example**:
201
202 CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
203 )))
204
205 (((
206 RETURN1:01 03 02 00 02 39 85 00 00(return data)
207 )))
208
209 (((
210 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.
211
212
213 )))
214
215 (((
216 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
217 )))
218
219 (((
220 RETURN2:01 03 02 08 DC BE 1D(return data)
221 )))
222
223 (((
224 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.
225
226
227 )))
228
229 (((
230 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
231 )))
232
233 (((
234 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
235 )))
236
237 (((
238 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.
239 )))
240
241 (((
242 Payload:01 00 02 39 85 08 DC 00 00 00 44
243 )))
244
245 [[image:image-20220527093204-13.png]]
246
247 AT COMMAND
248
249
250 (% 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.**
251
252 [[image:image-20220527093251-14.png]]
253
254 AT COMMAND
255
256
257 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
258
259 [[image:image-20220527093358-15.png]]
260
261 (((
262 DOWNLINK
263 )))
264
265 (((
266
267 )))
268
269 (((
270 (% style="color:#4f81bd" %)**Type Code 0xAF**
271 )))
272
273 (((
274 (% class="box infomessage" %)
275 (((
276 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
277 )))
278 )))
279
280 (((
281 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
282 )))
283
284 (((
285 Format: AF MM NN LL XX XX XX XX YY
286 )))
287
288 (((
289 Where:
290 )))
291
292 (((
293 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
294 )))
295
296 (((
297 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
298 )))
299
300 (((
301 LL: The length of AT+COMMAND or AT+DATACUT command
302 )))
303
304 (((
305 XX XX XX XX: AT+COMMAND or AT+DATACUT command
306 )))
307
308 (((
309 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
310 )))
311
312 (((
313 will execute an uplink after got this command.
314 )))
315
316 (((
317 (% style="color:#4f81bd" %)**Example:**
318 )))
319
320 (((
321 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
322 )))
323
324 [[image:image-20220527093430-16.png]]
325
326 DOWNLINK
327
328
329 [[image:image-20220527093508-17.png]]
330
331 DOWNLINK
332
333
334 [[image:image-20220527093530-18.png]]
335
336 DOWNLINK
337
338
339 [[image:image-20220527093607-19.png]]
340
341 DOWNLINK
342
343
344 [[image:image-20220527093628-20.png]]
345
346 DOWNLINK
347
348
349 === **1.3.4 How to configure and output commands for RS485 to USB** ===
350
351 (((
352 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.
353 )))
354
355 (((
356 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
357 )))
358
359 (((
360 Open the serial port debugging, set the send and receive to HEX.
361 )))
362
363 (((
364 Baud rate: 9600
365 )))
366
367 (((
368 check digit: Even
369 )))
370
371 [[image:image-20220527093708-21.png]]
372
373 USB
374
375
376 [[image:image-20220527093747-22.png]]
377
378 USB
379
380
381 (((
382 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.
383 )))
384
385 (((
386 (% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
387 )))
388
389 (((
390 output：01 03 04 00 00 00 42 7A 02
391 )))
392
393 [[image:image-20220527093821-23.png]]
394
395 USB
396
397
398 === **1.3.5 How to configure multiple devices and modify device addresses** ===
399
400 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.
401
402 (((
403 (((
404 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
405 )))
406 )))
407
408 [[image:image-20220527093849-24.png]]
409
410
411 **Example**:These two meters are examples of setting parameters and device addresses.
412
413 [[image:image-20220527093950-25.png]]
414
415 [[image:image-20220527094028-26.png]]
416
417 (((
418 (((
419 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.
420 )))
421 )))
422
423 (((
424 (((
425 We can use AT+CFGDEV to set the device address.
426 )))
427 )))
428
429 (((
430 (((
431 We modify the device address 01 of the first energy meter to 02.
432 )))
433 )))
434
435 [[image:image-20220527094100-27.png]]
436
437 (% class="box infomessage" %)
438 (((
439 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
440 )))
441
442 * 01:device adaress
443
444 * 10:function code
445
446 * 00 61：Register address
447
448 * 00 01：Number of Registers
449
450 * 02：Number of bytes
451
452 * 00 02：Modified device address
453
454 * 1：Check code
455
456 The device address setting of the energy meter is complete.
457
458 Another energy meter is a single active energy meter with a floating-point format.
459
460 Its default device address is 01, and the following are the parameters for configuring two energy meters.
461
462 [[image:image-20220527094150-28.png]]
463
464
465 [[image:image-20220527094224-29.png]]
466
467 **PAYLOAD:01 08 DF 43 62**
468
469 * 08 DF is the valid value of the meter with device address 02.
470 * 43 62 is the valid value of the meter with device address 01.
471
472
473
474 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
475
476 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:
477
478 [[image:image-20220527094330-30.png]]
479
480 Connection
481
482 * [[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
483
484
485
486 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
487
488 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:
489
490 * [[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
491
492 * [[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
493
494
495
496 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
497
498 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:
499
500 * [[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
501
502
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/]]