Version 4.6 by Xiaoling on 2022/05/12 10:45
Show last authors
1 = 1. Introduction =
2
3 This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
4
5 == 1.1 Example 1: Connect to Leak relay and VFD ==
6
7 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:
8
9 [[image:https://wiki.dragino.com/images/thumb/5/5c/RS485_01.png/600px-RS485_01.png||height="297" width="534"]]
10
11 Connection
12
13
14 [[image:https://wiki.dragino.com/images/thumb/f/f2/RS485_02.png/600px-RS485_02.png||height="743" width="528"]](% style="display:none" %)
15
16 Connection
17
18 Related documents:
19
20 * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
21 * [[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.
22 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
23
24 == 1.2 Example 2: Connect to Pulse Counter ==
25
26 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:
27
28 [[image:https://wiki.dragino.com/images/thumb/3/34/RS485_02_1.png/600px-RS485_02_1.png||height="364" width="600"]]
29
30 Connection
31
32
33 [[image:https://wiki.dragino.com/images/thumb/5/5f/RS485_02_2.png/600px-RS485_02_2.png||height="337" width="600"]]
34
35 Connection
36
37 * [[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
38 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
39
40 == 1.3 Example3: Use RS485-LN with energy meters ==
41
42 === 1.3.1 OverView ===
43
44 (((
45 **Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
46 )))
47
48 (((
49 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
50 )))
51
52 [[image:https://wiki.dragino.com/images/thumb/f/f4/Meter1.jpg/600px-Meter1.jpg||height="726" width="545"]]
53
54 Connection1
55
56 (((
57 How to connect with Energy Meter：
58 )))
59
60 (((
61 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.
62 )))
63
64 (((
65 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
66 )))
67
68 (((
69 Power Source VIN to RS485-LN VIN+
70 )))
71
72 (((
73 Power Source GND to RS485-LN VIN-
74 )))
75
76 (((
77 Once there is power, the RS485-LN will be on.
78 )))
79
80 [[image:https://wiki.dragino.com/images/thumb/1/15/Meter2.jpg/600px-Meter2.jpg||height="433" width="577"]]
81
82 Connection2
83
84
85 [[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="712" width="534"]]
86
87 Connection3
88
89
90 === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
91
92 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.
93
94 [[image:https://wiki.dragino.com/images/thumb/3/35/Meter4.png/600px-Meter4.png||alt="Meter4.png" height="193" width="600"]]
95
96 (% class="box infomessage" %)
97 (((
98 Example:AT+COMMAND1=01 03 00 00 00 01 84 0A
99 )))
100
101 * The first byte : slave address code (=001～247)
102 * The second byte : read register value function code
103 * 3rd and 4th bytes: start address of register to be read
104 * 5th and 6th bytes: Number of registers to read
105 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
106
107 (((
108 How to parse the reading of the return command of the parameter：
109 )))
110
111 (% class="box infomessage" %)
112 (((
113 Example:RETURN1：01 03 02 08 FD 7E 05
114 )))
115
116 * The first byte ARD: slave address code (=001～254)
117 * The second byte: Return to read function code
118 * 3rd byte: total number of bytes
119 * 4th～5th bytes: register data
120 * The 6th and 7th bytes: CRC16 checksum
121 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
122
123 === 1.3.3 How to configure RS485-LN and parse output commands ===
124
125 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
126
127 ==== 1.3.3.1 via AT COMMAND: ====
128
129 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
130
131 (((
132 If the configured parameters and commands are incorrect, the return value is not obtained.
133 )))
134
135 [[image:https://wiki.dragino.com/images/b/bc/AT_COMMAND1.png||height="358" width="456"]]
136
137 AT COMMAND
138
139 (% class="box infomessage" %)
140 (((
141 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
142 )))
143
144 a: length for the return of AT+COMMAND
145
146 b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
147
148 c: define the position for valid value.
149
150 [[image:https://wiki.dragino.com/images/7/7d/AT_COMMAND2.png||height="278" width="477"]]
151
152 AT COMMAND
153
154 PAYLOAD is available after the valid value is intercepted.
155
156
157 [[image:https://wiki.dragino.com/images/3/3a/AT_COMMAND4.png||height="219" width="576"]]
158
159 AT COMMAND
160
161 You can get configured PAYLOAD on TTN.
162
163
164 [[image:https://wiki.dragino.com/images/thumb/c/c2/AT_COMMAND3.png/600px-AT_COMMAND3.png||height="138" width="600"]]
165
166 (((
167 AT COMMAND
168 )))
169
170 (((
171
172 )))
173
174 (((
175 **Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
176 )))
177
178 (((
179 RETURN1:01 03 02 00 02 39 85 00 00(return data)
180 )))
181
182 (((
183 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.
184 )))
185
186 (((
187 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
188 )))
189
190 (((
191 RETURN2:01 03 02 08 DC BE 1D(return data)
192 )))
193
194 (((
195 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.
196 )))
197
198 (((
199 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
200 )))
201
202 (((
203 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
204 )))
205
206 (((
207 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.
208 )))
209
210 (((
211 Payload:01 00 02 39 85 08 DC 00 00 00 44
212 )))
213
214 [[image:https://wiki.dragino.com/images/thumb/9/9b/AT_COMMAND10.png/600px-AT_COMMAND10.png||height="278" width="600"]]
215
216 AT COMMAND
217
218 01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.
219
220
221 [[~[~[image:https://wiki.dragino.com/images/thumb/b/b8/AT_COMMAND11.png/600px-AT_COMMAND11.png~|~|height="271" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:AT_COMMAND11.png]]
222
223 AT COMMAND
224
225
226 ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
227
228 [[image:image-20220512104358-3.png]]
229
230 (((
231 DOWNLINK
232 )))
233
234 (((
235
236 )))
237
238 (((
239 **Type Code 0xAF**
240 )))
241
242 (((
243 (% class="box infomessage" %)
244 (((
245 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
246 )))
247 )))
248
249 (((
250 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
251 )))
252
253 (((
254 Format: AF MM NN LL XX XX XX XX YY
255 )))
256
257 (((
258 Where:
259 )))
260
261 (((
262 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
263 )))
264
265 (((
266 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
267 )))
268
269 (((
270 LL: The length of AT+COMMAND or AT+DATACUT command
271 )))
272
273 (((
274 XX XX XX XX: AT+COMMAND or AT+DATACUT command
275 )))
276
277 (((
278 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
279 )))
280
281 (((
282 will execute an uplink after got this command.
283 )))
284
285 (((
286 Example:
287 )))
288
289 (((
290 AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
291 )))
292
293 [[image:https://wiki.dragino.com/images/thumb/4/45/DOWNLINK_METER2.png/600px-DOWNLINK_METER2.png||height="208" width="600"]]
294
295 DOWNLINK
296
297
298 [[~[~[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]]
299
300 DOWNLINK
301
302
303 [[image:https://wiki.dragino.com/images/thumb/2/27/DOWNLINK_METER4.png/600px-DOWNLINK_METER4.png||height="210" width="600"]]
304
305 DOWNLINK
306
307
308 [[~[~[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]]
309
310 DOWNLINK
311
312
313 [[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
314
315 DOWNLINK
316
317
318 === 1.3.4 How to configure and output commands for RS485 to USB ===
319
320 (((
321 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.
322 )))
323
324 (((
325 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
326 )))
327
328 (((
329 Open the serial port debugging, set the send and receive to HEX.
330 )))
331
332 (((
333 Baud rate: 9600
334 )))
335
336 (((
337 check digit: Even
338 )))
339
340 [[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="725" width="544"]]
341
342 USB
343
344
345 [[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="728" width="546"]]
346
347 USB
348
349
350 (((
351 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.
352 )))
353
354 (((
355 **Example:**  input：01 03 00 31 00 02 95 c4
356 )))
357
358 (((
359 output：01 03 04 00 00 00 42 7A 02
360 )))
361
362 [[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
363
364 USB
365
366 === 1.3.5 How to configure multiple devices and modify device addresses ===
367
368 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.
369
370 (((
371 (((
372 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
373 )))
374 )))
375
376 [[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
377
378 **Example**:These two meters are examples of setting parameters and device addresses.
379
380 [[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="737" width="553"]]
381
382 [[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="733" width="550"]]
383
384 (((
385 (((
386 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.
387 )))
388 )))
389
390 (((
391 (((
392 We can use AT+CFGDEV to set the device address.
393 )))
394 )))
395
396 (((
397 (((
398 We modify the device address 01 of the first energy meter to 02.
399 )))
400 )))
401
402 [[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
403
404 AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
405
406 * 01:device adaress
407
408 * 10:function code
409
410 * 00 61：Register address
411
412 * 00 01：Number of Registers
413
414 * 02：Number of bytes
415
416 * 00 02：Modified device address
417
418 * 1：Check code
419
420 The device address setting of the energy meter is complete.
421
422 Another energy meter is a single active energy meter with a floating-point format.
423
424 Its default device address is 01, and the following are the parameters for configuring two energy meters.
425
426 [[image:https://wiki.dragino.com/images/1/13/Meter11.png||alt="Meter11.png" height="576" width="379"]]
427
428 [[image:https://wiki.dragino.com/images/thumb/7/7e/Meter12.png/600px-Meter12.png||alt="Meter12.png" height="262" width="600"]]
429
430 PAYLOAD:01 08 DF 43 62
431
432 * 08 DF is the valid value of the meter with device address 02.
433 * 43 62 is the valid value of the meter with device address 01.
434
435 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
436
437 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:
438
439 [[image:https://wiki.dragino.com/images/thumb/f/fa/RS485_04_2.png/600px-RS485_04_2.png||height="336" width="600"]]
440
441 Connection
442
443 * [[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
444
445 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
446
447 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:
448
449 * [[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
450
451 * [[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
452
453 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
454
455 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:
456
457 * [[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
458
459 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
460
461 [[image:https://wiki.dragino.com/images/thumb/9/97/PLC_M221.png/600px-PLC_M221.png||height="353" width="600"]]
462
463 Network Structure
464
465 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]

Applications

Navigation

Copyright ©2010-2024 Dragino Technology Co., LTD. All rights reserved
Dragino Wiki v2.0