Version 20.2 by Xiaoling on 2022/05/27 09:32
Show last authors
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 == 1.1 Example 1: Connect to Leak relay and VFD ==
11
12 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:
13
14 [[image:image-20220527091852-1.png]]
15
16 Connection
17
18
19
20 [[image:image-20220527091942-2.png]](% style="display:none" %)
21
22 Connection
23
24
25 Related documents:
26
27 * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
28 * [[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.
29 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
30
31
32 == 1.2 Example 2: Connect to Pulse Counter ==
33
34 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:
35
36 [[image:image-20220527092058-3.png]]
37
38 Connection
39
40
41 [[image:image-20220527092146-4.png]]
42
43 Connection
44
45 * [[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
46 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
47
48 (% class="wikigeneratedid" %)
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 **Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
197 )))
198
199 (((
200 RETURN1:01 03 02 00 02 39 85 00 00(return data)
201 )))
202
203 (((
204 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.
205 )))
206
207 (((
208 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
209 )))
210
211 (((
212 RETURN2:01 03 02 08 DC BE 1D(return data)
213 )))
214
215 (((
216 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.
217 )))
218
219 (((
220 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
221 )))
222
223 (((
224 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
225 )))
226
227 (((
228 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.
229 )))
230
231 (((
232 Payload:01 00 02 39 85 08 DC 00 00 00 44
233 )))
234
235 [[image:image-20220527093204-13.png]]
236
237 AT COMMAND
238
239
240 01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.
241
242 [[image:image-20220527093251-14.png]]
243
244 AT COMMAND
245
246
247 ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
248
249 [[image:image-20220512104358-3.png]]
250
251 (((
252 DOWNLINK
253 )))
254
255 (((
256
257 )))
258
259 (((
260 **Type Code 0xAF**
261 )))
262
263 (((
264 (% class="box infomessage" %)
265 (((
266 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
267 )))
268 )))
269
270 (((
271 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
272 )))
273
274 (((
275 Format: AF MM NN LL XX XX XX XX YY
276 )))
277
278 (((
279 Where:
280 )))
281
282 (((
283 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
284 )))
285
286 (((
287 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
288 )))
289
290 (((
291 LL: The length of AT+COMMAND or AT+DATACUT command
292 )))
293
294 (((
295 XX XX XX XX: AT+COMMAND or AT+DATACUT command
296 )))
297
298 (((
299 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
300 )))
301
302 (((
303 will execute an uplink after got this command.
304 )))
305
306 (((
307 Example:
308 )))
309
310 (((
311 AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
312 )))
313
314 [[image:https://wiki.dragino.com/images/thumb/4/45/DOWNLINK_METER2.png/600px-DOWNLINK_METER2.png||height="208" width="600"]]
315
316 DOWNLINK
317
318
319 [[~[~[image:https://wiki.dragino.com/images/thumb/2/20/DOWNLINK_METER3.png/600px-DOWNLINK_METER3.png~|~|height="105" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:DOWNLINK_METER3.png]]
320
321 DOWNLINK
322
323
324 [[image:https://wiki.dragino.com/images/thumb/2/27/DOWNLINK_METER4.png/600px-DOWNLINK_METER4.png||height="210" width="600"]]
325
326 DOWNLINK
327
328
329 [[~[~[image:https://wiki.dragino.com/images/thumb/3/39/DOWNLINK_METER5.png/600px-DOWNLINK_METER5.png~|~|height="176" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:DOWNLINK_METER5.png]]
330
331 DOWNLINK
332
333
334 [[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
335
336 DOWNLINK
337
338
339 === 1.3.4 How to configure and output commands for RS485 to USB ===
340
341 (((
342 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.
343 )))
344
345 (((
346 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
347 )))
348
349 (((
350 Open the serial port debugging, set the send and receive to HEX.
351 )))
352
353 (((
354 Baud rate: 9600
355 )))
356
357 (((
358 check digit: Even
359 )))
360
361 [[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="725" width="544"]]
362
363 USB
364
365
366 [[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="728" width="546"]]
367
368 USB
369
370
371 (((
372 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.
373 )))
374
375 (((
376 **Example:**  input：01 03 00 31 00 02 95 c4
377 )))
378
379 (((
380 output：01 03 04 00 00 00 42 7A 02
381 )))
382
383 [[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
384
385 USB
386
387 === 1.3.5 How to configure multiple devices and modify device addresses ===
388
389 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.
390
391 (((
392 (((
393 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
394 )))
395 )))
396
397 [[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
398
399 **Example**:These two meters are examples of setting parameters and device addresses.
400
401 [[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="737" width="553"]]
402
403 [[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="733" width="550"]]
404
405 (((
406 (((
407 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.
408 )))
409 )))
410
411 (((
412 (((
413 We can use AT+CFGDEV to set the device address.
414 )))
415 )))
416
417 (((
418 (((
419 We modify the device address 01 of the first energy meter to 02.
420 )))
421 )))
422
423 [[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
424
425 AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
426
427 * 01:device adaress
428
429 * 10:function code
430
431 * 00 61：Register address
432
433 * 00 01：Number of Registers
434
435 * 02：Number of bytes
436
437 * 00 02：Modified device address
438
439 * 1：Check code
440
441 The device address setting of the energy meter is complete.
442
443 Another energy meter is a single active energy meter with a floating-point format.
444
445 Its default device address is 01, and the following are the parameters for configuring two energy meters.
446
447 [[image:https://wiki.dragino.com/images/1/13/Meter11.png||alt="Meter11.png" height="576" width="379"]]
448
449 [[image:https://wiki.dragino.com/images/thumb/7/7e/Meter12.png/600px-Meter12.png||alt="Meter12.png" height="262" width="600"]]
450
451 PAYLOAD:01 08 DF 43 62
452
453 * 08 DF is the valid value of the meter with device address 02.
454 * 43 62 is the valid value of the meter with device address 01.
455
456 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
457
458 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:
459
460 [[image:https://wiki.dragino.com/images/thumb/f/fa/RS485_04_2.png/600px-RS485_04_2.png||height="336" width="600"]]
461
462 Connection
463
464 * [[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
465
466 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
467
468 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:
469
470 * [[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
471
472 * [[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
473
474 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
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 CEM C31 485-T1-MID and send the data for remote minitor. The structure is like below:
477
478 * [[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
479
480 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
481
482 [[image:https://wiki.dragino.com/images/thumb/9/97/PLC_M221.png/600px-PLC_M221.png||height="353" width="600"]]
483
484 Network Structure
485
486 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]

Applications

Navigation

Copyright ©2010-2022 Dragino Technology Co., LTD. All rights reserved
Dragino Wiki v2.0