Version 41.20 by Xiaoling on 2022/06/01 14:16
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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
186 PAYLOAD is available after the valid value is intercepted.
187
188
189 [[image:image-20220527093059-11.png]]
190
191 AT COMMAND
192
193
194
195 You can get configured PAYLOAD on TTN.
196
197 [[image:image-20220527093133-12.png]]
198
199 (((
200 AT COMMAND
201 )))
202
203 (((
204
205 )))
206
207 (((
208 (% style="color:#4f81bd" %)**Example**:
209
210 CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
211 )))
212
213 (((
214 RETURN1:01 03 02 00 02 39 85 00 00(return data)
215 )))
216
217 (((
218 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.
219
220
221 )))
222
223 (((
224 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
225 )))
226
227 (((
228 RETURN2:01 03 02 08 DC BE 1D(return data)
229 )))
230
231 (((
232 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.
233
234
235 )))
236
237 (((
238 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
239 )))
240
241 (((
242 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
243 )))
244
245 (((
246 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.
247 )))
248
249 (((
250 Payload:01 00 02 39 85 08 DC 00 00 00 44
251 )))
252
253 [[image:image-20220527093204-13.png]]
254
255 AT COMMAND
256
257
258 (% 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.**
259
260
261
262 [[image:image-20220527093251-14.png]]
263
264 AT COMMAND
265
266
267 ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
268
269 [[image:image-20220527093358-15.png]]
270
271 (((
272 DOWNLINK
273 )))
274
275 (((
276
277 )))
278
279 (((
280 (% style="color:#4f81bd" %)**Type Code 0xAF**
281 )))
282
283 (((
284 (% class="box infomessage" %)
285 (((
286 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
287 )))
288 )))
289
290 (((
291 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
292 )))
293
294 (((
295 Format: AF MM NN LL XX XX XX XX YY
296 )))
297
298 (((
299 Where:
300 )))
301
302 (((
303 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
304 )))
305
306 (((
307 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
308 )))
309
310 (((
311 LL: The length of AT+COMMAND or AT+DATACUT command
312 )))
313
314 (((
315 XX XX XX XX: AT+COMMAND or AT+DATACUT command
316 )))
317
318 (((
319 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
320 )))
321
322 (((
323 will execute an uplink after got this command.
324 )))
325
326 (((
327
328
329 (% style="color:#4f81bd" %)**Example:**
330 )))
331
332 (((
333 **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
334 )))
335
336 [[image:image-20220527093430-16.png]]
337
338 DOWNLINK
339
340
341
342 [[image:image-20220527093508-17.png]]
343
344 DOWNLINK
345
346
347
348 [[image:image-20220527093530-18.png]]
349
350 DOWNLINK
351
352
353 [[image:image-20220527093607-19.png]]
354
355 DOWNLINK
356
357
358 [[image:image-20220527093628-20.png]]
359
360 DOWNLINK
361
362
363 === **1.3.4 How to configure and output commands for RS485 to USB** ===
364
365 (((
366 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.
367 )))
368
369 (((
370 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
371 )))
372
373 (((
374 Open the serial port debugging, set the send and receive to HEX.
375 )))
376
377 (((
378 Baud rate: 9600
379 )))
380
381 (((
382 check digit: Even
383 )))
384
385 [[image:image-20220527093708-21.png]]
386
387 USB
388
389
390 [[image:image-20220527093747-22.png]]
391
392 USB
393
394
395 (((
396 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.
397 )))
398
399 (((
400 (% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
401 )))
402
403 (((
404 output：01 03 04 00 00 00 42 7A 02
405 )))
406
407 [[image:image-20220527093821-23.png]]
408
409 USB
410
411
412 === **1.3.5 How to configure multiple devices and modify device addresses** ===
413
414 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.
415
416 (((
417 (((
418 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
419 )))
420 )))
421
422 [[image:image-20220527093849-24.png]]
423
424
425 **Example**:These two meters are examples of setting parameters and device addresses.
426
427 [[image:image-20220527093950-25.png]]
428
429 [[image:image-20220527094028-26.png]]
430
431 (((
432 (((
433 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.
434 )))
435 )))
436
437 (((
438 (((
439 We can use AT+CFGDEV to set the device address.
440 )))
441 )))
442
443 (((
444 (((
445 We modify the device address 01 of the first energy meter to 02.
446 )))
447 )))
448
449 [[image:image-20220527094100-27.png]]
450
451 (% class="box infomessage" %)
452 (((
453 **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
454 )))
455
456 * 01:device adaress
457
458 * 10:function code
459
460 * 00 61：Register address
461
462 * 00 01：Number of Registers
463
464 * 02：Number of bytes
465
466 * 00 02：Modified device address
467
468 * 1：Check code
469
470 The device address setting of the energy meter is complete.
471
472 Another energy meter is a single active energy meter with a floating-point format.
473
474 Its default device address is 01, and the following are the parameters for configuring two energy meters.
475
476 [[image:image-20220527094150-28.png]]
477
478
479 [[image:image-20220527094224-29.png]]
480
481 **PAYLOAD:01 08 DF 43 62**
482
483 * 08 DF is the valid value of the meter with device address 02.
484 * 43 62 is the valid value of the meter with device address 01.
485
486
487 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
488
489 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:
490
491 [[image:image-20220527094330-30.png]]
492
493 Connection
494
495 * [[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
496
497
498 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or 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-BL to connect to SEM Three Energy Meter and send the data to mobile phone for remote minitor. The structure is like below:
501
502 * [[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
503
504 * [[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
505
506 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
507
508 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:
509
510 * [[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
511
512 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
513
514 [[image:image-20220527094556-31.png]]
515
516 Network Structure
517
518 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]

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