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Version 38.2 by Xiaoling on 2022/05/27 09:47
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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
11 == 1.1 Example 1: Connect to Leak relay and VFD ==
12
13 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:
14
15 [[image:image-20220527091852-1.png]]
16
17 Connection
18
19
20
21 [[image:image-20220527091942-2.png]](% style="display:none" %)
22
23 Connection
24
25
26 Related documents:
27
28 * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
29 * [[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.
30 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
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 == ==
49
50 == 1.3 Example3: Use RS485-LN with energy meters ==
51
52 === 1.3.1 OverView ===
53
54 (((
55 **Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
56 )))
57
58 (((
59 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
60 )))
61
62 [[image:image-20220527092419-5.png]]
63
64 Connection1
65
66
67 (((
68 How to connect with Energy Meter：
69 )))
70
71 (((
72 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.
73 )))
74
75 (((
76 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
77 )))
78
79 (((
80 Power Source VIN to RS485-LN VIN+
81 )))
82
83 (((
84 Power Source GND to RS485-LN VIN-
85 )))
86
87 (((
88 Once there is power, the RS485-LN will be on.
89 )))
90
91 [[image:image-20220527092514-6.png]]
92
93 Connection2
94
95
96 [[image:image-20220527092555-7.png]]
97
98 Connection3
99
100
101 === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
102
103 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.
104
105 [[image:image-20220527092629-8.png]]
106
107
108 (% class="box infomessage" %)
109 (((
110 **Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
111 )))
112
113 * The first byte : slave address code (=001～247)
114 * The second byte : read register value function code
115 * 3rd and 4th bytes: start address of register to be read
116 * 5th and 6th bytes: Number of registers to read
117 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
118
119 (((
120 How to parse the reading of the return command of the parameter：
121 )))
122
123 (% class="box infomessage" %)
124 (((
125 **Example:** RETURN1：01 03 02 08 FD 7E 05
126 )))
127
128 * The first byte ARD: slave address code (=001～254)
129 * The second byte: Return to read function code
130 * 3rd byte: total number of bytes
131 * 4th～5th bytes: register data
132 * The 6th and 7th bytes: CRC16 checksum
133 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
134
135 (% class="wikigeneratedid" %)
136 (((
137
138 )))
139
140 === 1.3.3 How to configure RS485-LN and parse output commands ===
141
142 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
143
144
145 ==== 1.3.3.1 via AT COMMAND: ====
146
147 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
148
149 (((
150 If the configured parameters and commands are incorrect, the return value is not obtained.
151 )))
152
153 [[image:image-20220527092748-9.png]]
154
155 AT COMMAND
156
157
158 (% class="box infomessage" %)
159 (((
160 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
161 )))
162
163 a: length for the return of AT+COMMAND
164
165 b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
166
167 c: define the position for valid value.
168
169 [[image:image-20220527092936-10.png]]
170
171 AT COMMAND
172
173
174 PAYLOAD is available after the valid value is intercepted.
175
176
177 [[image:image-20220527093059-11.png]]
178
179 AT COMMAND
180
181
182 You can get configured PAYLOAD on TTN.
183
184 [[image:image-20220527093133-12.png]]
185
186 (((
187 AT COMMAND
188 )))
189
190 (((
191
192 )))
193
194 (((
195 **Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
196 )))
197
198 (((
199 RETURN1:01 03 02 00 02 39 85 00 00(return data)
200 )))
201
202 (((
203 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.
204 )))
205
206 (((
207 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
208 )))
209
210 (((
211 RETURN2:01 03 02 08 DC BE 1D(return data)
212 )))
213
214 (((
215 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.
216 )))
217
218 (((
219 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
220 )))
221
222 (((
223 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
224 )))
225
226 (((
227 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.
228 )))
229
230 (((
231 Payload:01 00 02 39 85 08 DC 00 00 00 44
232 )))
233
234 [[image:image-20220527093204-13.png]]
235
236 AT COMMAND
237
238
239 (% 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.**
240
241 [[image:image-20220527093251-14.png]]
242
243 AT COMMAND
244
245
246 ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
247
248 [[image:image-20220527093358-15.png]]
249
250 (((
251 DOWNLINK
252 )))
253
254 (((
255
256 )))
257
258 (((
259 **Type Code 0xAF**
260 )))
261
262 (((
263 (% class="box infomessage" %)
264 (((
265 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
266 )))
267 )))
268
269 (((
270 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
271 )))
272
273 (((
274 Format: AF MM NN LL XX XX XX XX YY
275 )))
276
277 (((
278 Where:
279 )))
280
281 (((
282 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
283 )))
284
285 (((
286 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
287 )))
288
289 (((
290 LL: The length of AT+COMMAND or AT+DATACUT command
291 )))
292
293 (((
294 XX XX XX XX: AT+COMMAND or AT+DATACUT command
295 )))
296
297 (((
298 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
299 )))
300
301 (((
302 will execute an uplink after got this command.
303 )))
304
305 (((
306 Example:
307 )))
308
309 (((
310 AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
311 )))
312
313 [[image:image-20220527093430-16.png]]
314
315 DOWNLINK
316
317
318 [[image:image-20220527093508-17.png]]
319
320 DOWNLINK
321
322
323 [[image:image-20220527093530-18.png]]
324
325 DOWNLINK
326
327
328 [[image:image-20220527093607-19.png]]
329
330 DOWNLINK
331
332
333 [[image:image-20220527093628-20.png]]
334
335 DOWNLINK
336
337
338 === 1.3.4 How to configure and output commands for RS485 to USB ===
339
340 (((
341 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.
342 )))
343
344 (((
345 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
346 )))
347
348 (((
349 Open the serial port debugging, set the send and receive to HEX.
350 )))
351
352 (((
353 Baud rate: 9600
354 )))
355
356 (((
357 check digit: Even
358 )))
359
360 [[image:image-20220527093708-21.png]]
361
362 USB
363
364
365 [[image:image-20220527093747-22.png]]
366
367 USB
368
369
370 (((
371 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.
372 )))
373
374 (((
375 **Example:**  input：01 03 00 31 00 02 95 c4
376 )))
377
378 (((
379 output：01 03 04 00 00 00 42 7A 02
380 )))
381
382 [[image:image-20220527093821-23.png]]
383
384 USB
385
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:image-20220527093849-24.png]]
398
399
400 **Example**:These two meters are examples of setting parameters and device addresses.
401
402 [[image:image-20220527093950-25.png]]
403
404 [[image:image-20220527094028-26.png]]
405
406 (((
407 (((
408 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.
409 )))
410 )))
411
412 (((
413 (((
414 We can use AT+CFGDEV to set the device address.
415 )))
416 )))
417
418 (((
419 (((
420 We modify the device address 01 of the first energy meter to 02.
421 )))
422 )))
423
424 [[image:image-20220527094100-27.png]]
425
426 (% class="box infomessage" %)
427 (((
428 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
429 )))
430
431 * 01:device adaress
432
433 * 10:function code
434
435 * 00 61：Register address
436
437 * 00 01：Number of Registers
438
439 * 02：Number of bytes
440
441 * 00 02：Modified device address
442
443 * 1：Check code
444
445 The device address setting of the energy meter is complete.
446
447 Another energy meter is a single active energy meter with a floating-point format.
448
449 Its default device address is 01, and the following are the parameters for configuring two energy meters.
450
451 [[image:image-20220527094150-28.png]]
452
453
454 [[image:image-20220527094224-29.png]]
455
456 PAYLOAD:01 08 DF 43 62
457
458 * 08 DF is the valid value of the meter with device address 02.
459 * 43 62 is the valid value of the meter with device address 01.
460
461 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
462
463 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:
464
465 [[image:image-20220527094330-30.png]]
466
467 Connection
468
469 * [[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
470
471 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
472
473 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:
474
475 * [[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
476
477 * [[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
478
479 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
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 CEM C31 485-T1-MID and send the data for remote minitor. The structure is like below:
482
483 * [[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
484
485 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
486
487 [[image:image-20220527094556-31.png]]
488
489 Network Structure
490
491 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]