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Version 1.12 by Xiaoling on 2022/05/12 10:13
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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 [[image:https://wiki.dragino.com/images/thumb/f/f2/RS485_02.png/600px-RS485_02.png||height="743" width="528"]](% style="display:none" %)
14
15 Connection
16
17 Related documents:
18
19 * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
20 * [[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.
21 * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
22
23 == 1.2 Example 2: Connect to Pulse Counter ==
24
25 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:
26
27 [[image:https://wiki.dragino.com/images/thumb/3/34/RS485_02_1.png/600px-RS485_02_1.png||height="364" width="600"]]
28
29 Connection
30
31 [[image:https://wiki.dragino.com/images/thumb/5/5f/RS485_02_2.png/600px-RS485_02_2.png||height="337" width="600"]]
32
33 Connection
34
35 * [[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
36 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
37
38 == 1.3 Example3: Use RS485-LN with energy meters ==
39
40 === 1.3.1 OverView ===
41
42 (((
43 **Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
44 )))
45
46 (((
47 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
48 )))
49
50 [[image:https://wiki.dragino.com/images/thumb/f/f4/Meter1.jpg/600px-Meter1.jpg||height="726" width="545"]]
51
52 Connection1
53
54 How to connect with Energy Meter：
55
56 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.
57
58 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
59
60 Power Source VIN to RS485-LN VIN+
61
62 Power Source GND to RS485-LN VIN-
63
64 Once there is power, the RS485-LN will be on.
65
66 [[image:https://wiki.dragino.com/images/thumb/1/15/Meter2.jpg/600px-Meter2.jpg||height="433" width="577"]]
67
68 Connection2
69
70
71 [[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="763" width="573"]]
72
73 Connection3
74
75
76 === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
77
78 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.
79
80 [[image:https://wiki.dragino.com/images/thumb/3/35/Meter4.png/600px-Meter4.png||alt="Meter4.png" height="193" width="600"]]
81
82 (% class="box infomessage" %)
83 (((
84 Example:AT+COMMAND1=01 03 00 00 00 01 84 0A
85 )))
86
87 * The first byte : slave address code (=001～247)
88 * The second byte : read register value function code
89 * 3rd and 4th bytes: start address of register to be read
90 * 5th and 6th bytes: Number of registers to read
91 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
92
93 (((
94 How to parse the reading of the return command of the parameter：
95 )))
96
97 (% class="box infomessage" %)
98 (((
99 Example:RETURN1：01 03 02 08 FD 7E 05
100 )))
101
102 * The first byte ARD: slave address code (=001～254)
103 * The second byte: Return to read function code
104 * 3rd byte: total number of bytes
105 * 4th～5th bytes: register data
106 * The 6th and 7th bytes: CRC16 checksum
107 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
108
109 === 1.3.3 How to configure RS485-LN and parse output commands ===
110
111 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
112
113 ==== 1.3.3.1 via AT COMMAND: ====
114
115 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
116
117 (((
118 If the configured parameters and commands are incorrect, the return value is not obtained.
119 )))
120
121 [[image:https://wiki.dragino.com/images/b/bc/AT_COMMAND1.png||height="358" width="456"]]
122
123 AT COMMAND
124
125 (% class="box infomessage" %)
126 (((
127 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
128 )))
129
130 a: length for the return of AT+COMMAND
131
132 b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
133
134 c: define the position for valid value.
135
136 [[image:https://wiki.dragino.com/images/7/7d/AT_COMMAND2.png||height="278" width="477"]]
137
138 AT COMMAND
139
140 PAYLOAD is available after the valid value is intercepted.
141
142
143 [[image:https://wiki.dragino.com/images/3/3a/AT_COMMAND4.png||height="219" width="576"]]
144
145 AT COMMAND
146
147 You can get configured PAYLOAD on TTN.
148
149
150 [[image:https://wiki.dragino.com/images/thumb/c/c2/AT_COMMAND3.png/600px-AT_COMMAND3.png||height="138" width="600"]]
151
152 (((
153 AT COMMAND
154 )))
155
156 (((
157 **Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
158 )))
159
160 (((
161 RETURN1:01 03 02 00 02 39 85 00 00(return data)
162 )))
163
164 (((
165 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.
166 )))
167
168 (((
169 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
170 )))
171
172 (((
173 RETURN2:01 03 02 08 DC BE 1D(return data)
174 )))
175
176 (((
177 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.
178 )))
179
180 (((
181 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
182 )))
183
184 (((
185 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
186 )))
187
188 (((
189 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.
190 )))
191
192 (((
193 Payload:01 00 02 39 85 08 DC 00 00 00 44
194 )))
195
196 [[image:https://wiki.dragino.com/images/thumb/9/9b/AT_COMMAND10.png/600px-AT_COMMAND10.png||height="278" width="600"]]
197
198 AT COMMAND
199
200 01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.
201
202
203 [[~[~[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]]
204
205 AT COMMAND
206
207
208 ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
209
210 [[image:https://wiki.dragino.com/images/thumb/f/fc/DOWNLINK_METER1.png/600px-DOWNLINK_METER1.png||height="423" width="600"]]
211
212 (((
213 DOWNLINK
214 )))
215
216 (((
217
218 )))
219
220 (((
221 Type Code 0xAF
222 )))
223
224 (((
225 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
226 )))
227
228 (((
229 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
230 )))
231
232 (((
233 Format: AF MM NN LL XX XX XX XX YY
234 )))
235
236 (((
237 Where:
238 )))
239
240 (((
241 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
242 )))
243
244 (((
245 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
246 )))
247
248 (((
249 LL: The length of AT+COMMAND or AT+DATACUT command
250 )))
251
252 (((
253 XX XX XX XX: AT+COMMAND or AT+DATACUT command
254 )))
255
256 (((
257 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
258 )))
259
260 (((
261 will execute an uplink after got this command.
262 )))
263
264 (((
265 Example:
266 )))
267
268 (((
269 AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
270 )))
271
272 [[image:https://wiki.dragino.com/images/thumb/4/45/DOWNLINK_METER2.png/600px-DOWNLINK_METER2.png||height="208" width="600"]]
273
274 DOWNLINK
275
276
277 [[~[~[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]]
278
279 DOWNLINK
280
281
282 [[image:https://wiki.dragino.com/images/thumb/2/27/DOWNLINK_METER4.png/600px-DOWNLINK_METER4.png||height="210" width="600"]]
283
284 DOWNLINK
285
286
287 [[~[~[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]]
288
289 DOWNLINK
290
291 [[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
292
293 DOWNLINK
294
295
296 === 1.3.4 How to configure and output commands for RS485 to USB ===
297
298 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.
299
300 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
301
302 Open the serial port debugging, set the send and receive to HEX.
303
304 Baud rate: 9600
305
306 check digit: Even
307
308 [[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="800" width="600"]]
309
310 USB
311
312 [[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="800" width="600"]]
313
314 USB
315
316 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.
317
318 Example:input：01 03 00 31 00 02 95 c4
319
320 {{{ output:01 03 04 00 00 00 42 7A 02
321 }}}
322
323 [[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
324
325 USB
326
327 === 1.3.5 How to configure multiple devices and modify device addresses ===
328
329 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.
330
331 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
332
333 [[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
334
335 Example:These two meters are examples of setting parameters and device addresses.
336
337 [[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="800" width="600"]]
338
339 [[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="800" width="600"]]
340
341 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.
342
343 We can use AT+CFGDEV to set the device address.
344
345 We modify the device address 01 of the first energy meter to 02.
346
347 [[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
348
349 AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
350
351 * 01:device adaress
352
353 * 10:function code
354
355 * 00 61：Register address
356
357 * 00 01：Number of Registers
358
359 * 02：Number of bytes
360
361 * 00 02：Modified device address
362
363 * 1：Check code
364
365 The device address setting of the energy meter is complete.
366
367 Another energy meter is a single active energy meter with a floating-point format.
368
369 Its default device address is 01, and the following are the parameters for configuring two energy meters.
370
371 [[image:https://wiki.dragino.com/images/1/13/Meter11.png||alt="Meter11.png" height="576" width="379"]]
372
373 [[image:https://wiki.dragino.com/images/thumb/7/7e/Meter12.png/600px-Meter12.png||alt="Meter12.png" height="262" width="600"]]
374
375 PAYLOAD:01 08 DF 43 62
376
377 * 08 DF is the valid value of the meter with device address 02.
378 * 43 62 is the valid value of the meter with device address 01.
379
380 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
381
382 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:
383
384 [[image:https://wiki.dragino.com/images/thumb/f/fa/RS485_04_2.png/600px-RS485_04_2.png||height="336" width="600"]]
385
386 Connection
387
388 * [[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
389
390 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
391
392 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:
393
394 * [[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
395
396 * [[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
397
398 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
399
400 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:
401
402 * [[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
403
404 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
405
406 [[image:https://wiki.dragino.com/images/thumb/9/97/PLC_M221.png/600px-PLC_M221.png||height="353" width="600"]]
407
408 Network Structure
409
410 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]