Skip to Content
Version 1.11 by Xiaoling on 2022/05/12 10:07
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 [[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 [[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="800" width="600"]]
71
72 Connection3
73
74
75 === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
76
77 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.
78
79 [[image:https://wiki.dragino.com/images/thumb/3/35/Meter4.png/600px-Meter4.png||alt="Meter4.png" height="193" width="600"]]
80
81 (% class="box infomessage" %)
82 (((
83 Example:AT+COMMAND1=01 03 00 00 00 01 84 0A
84 )))
85
86 * The first byte : slave address code (=001～247)
87 * The second byte : read register value function code
88 * 3rd and 4th bytes: start address of register to be read
89 * 5th and 6th bytes: Number of registers to read
90 * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
91
92 How to parse the reading of the return command of the parameter：
93
94 (% class="box infomessage" %)
95 (((
96 Example:RETURN1：01 03 02 08 FD 7E 05
97 )))
98
99 * The first byte ARD: slave address code (=001～254)
100 * The second byte: Return to read function code
101 * 3rd byte: total number of bytes
102 * 4th～5th bytes: register data
103 * The 6th and 7th bytes: CRC16 checksum
104 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
105
106 === 1.3.3 How to configure RS485-LN and parse output commands ===
107
108 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
109
110 ==== 1.3.3.1 via AT COMMAND: ====
111
112 First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
113
114 (((
115 If the configured parameters and commands are incorrect, the return value is not obtained.
116 )))
117
118 [[image:https://wiki.dragino.com/images/b/bc/AT_COMMAND1.png||height="358" width="456"]]
119
120 **AT COMMAND**
121
122 (% class="box infomessage" %)
123 (((
124 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
125 )))
126
127 a: length for the return of AT+COMMAND
128
129 b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
130
131 c: define the position for valid value.
132
133 [[image:https://wiki.dragino.com/images/7/7d/AT_COMMAND2.png||height="278" width="477"]]
134
135 AT COMMAND
136
137 PAYLOAD is available after the valid value is intercepted.
138
139
140 [[image:https://wiki.dragino.com/images/3/3a/AT_COMMAND4.png||height="219" width="576"]]
141
142 AT COMMAND
143
144 You can get configured PAYLOAD on TTN.
145
146
147 [[image:https://wiki.dragino.com/images/thumb/c/c2/AT_COMMAND3.png/600px-AT_COMMAND3.png||height="138" width="600"]]
148
149 AT COMMAND
150
151 **Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
152
153 RETURN1:01 03 02 00 02 39 85 00 00(return data)
154
155 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.
156
157 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
158
159 RETURN2:01 03 02 08 DC BE 1D(return data)
160
161 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.
162
163 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
164
165 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
166
167 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.
168
169 Payload:01 00 02 39 85 08 DC 00 00 00 44
170
171 [[image:https://wiki.dragino.com/images/thumb/9/9b/AT_COMMAND10.png/600px-AT_COMMAND10.png||height="278" width="600"]]
172
173 AT COMMAND
174
175 01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.
176
177
178 [[~[~[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]]
179
180 AT COMMAND
181
182
183 ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
184
185 [[image:https://wiki.dragino.com/images/thumb/f/fc/DOWNLINK_METER1.png/600px-DOWNLINK_METER1.png||height="423" width="600"]]
186
187 (((
188 DOWNLINK
189 )))
190
191 (((
192
193 )))
194
195 (((
196 Type Code 0xAF
197 )))
198
199 (((
200 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
201 )))
202
203 (((
204 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
205 )))
206
207 (((
208 Format: AF MM NN LL XX XX XX XX YY
209 )))
210
211 (((
212 Where:
213 )))
214
215 (((
216 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
217 )))
218
219 (((
220 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
221 )))
222
223 (((
224 LL: The length of AT+COMMAND or AT+DATACUT command
225 )))
226
227 (((
228 XX XX XX XX: AT+COMMAND or AT+DATACUT command
229 )))
230
231 (((
232 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
233 )))
234
235 (((
236 will execute an uplink after got this command.
237 )))
238
239 (((
240 Example:
241 )))
242
243 (((
244 AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
245 )))
246
247 [[image:https://wiki.dragino.com/images/thumb/4/45/DOWNLINK_METER2.png/600px-DOWNLINK_METER2.png||height="208" width="600"]]
248
249 DOWNLINK
250
251
252 [[~[~[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]]
253
254 DOWNLINK
255
256
257 [[image:https://wiki.dragino.com/images/thumb/2/27/DOWNLINK_METER4.png/600px-DOWNLINK_METER4.png||height="210" width="600"]]
258
259 DOWNLINK
260
261
262 [[~[~[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]]
263
264 DOWNLINK
265
266 [[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
267
268 DOWNLINK
269
270
271 === 1.3.4 How to configure and output commands for RS485 to USB ===
272
273 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.
274
275 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
276
277 Open the serial port debugging, set the send and receive to HEX.
278
279 Baud rate: 9600
280
281 check digit: Even
282
283 [[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="800" width="600"]]
284
285 USB
286
287 [[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="800" width="600"]]
288
289 USB
290
291 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.
292
293 Example:input：01 03 00 31 00 02 95 c4
294
295 {{{ output:01 03 04 00 00 00 42 7A 02
296 }}}
297
298 [[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
299
300 USB
301
302 === 1.3.5 How to configure multiple devices and modify device addresses ===
303
304 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.
305
306 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
307
308 [[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
309
310 Example:These two meters are examples of setting parameters and device addresses.
311
312 [[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="800" width="600"]]
313
314 [[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="800" width="600"]]
315
316 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.
317
318 We can use AT+CFGDEV to set the device address.
319
320 We modify the device address 01 of the first energy meter to 02.
321
322 [[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
323
324 AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
325
326 * 01:device adaress
327
328 * 10:function code
329
330 * 00 61：Register address
331
332 * 00 01：Number of Registers
333
334 * 02：Number of bytes
335
336 * 00 02：Modified device address
337
338 * 1：Check code
339
340 The device address setting of the energy meter is complete.
341
342 Another energy meter is a single active energy meter with a floating-point format.
343
344 Its default device address is 01, and the following are the parameters for configuring two energy meters.
345
346 [[image:https://wiki.dragino.com/images/1/13/Meter11.png||alt="Meter11.png" height="576" width="379"]]
347
348 [[image:https://wiki.dragino.com/images/thumb/7/7e/Meter12.png/600px-Meter12.png||alt="Meter12.png" height="262" width="600"]]
349
350 PAYLOAD:01 08 DF 43 62
351
352 * 08 DF is the valid value of the meter with device address 02.
353 * 43 62 is the valid value of the meter with device address 01.
354
355 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
356
357 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:
358
359 [[image:https://wiki.dragino.com/images/thumb/f/fa/RS485_04_2.png/600px-RS485_04_2.png||height="336" width="600"]]
360
361 Connection
362
363 * [[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
364
365 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
366
367 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:
368
369 * [[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
370
371 * [[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
372
373 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
374
375 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:
376
377 * [[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
378
379 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
380
381 [[image:https://wiki.dragino.com/images/thumb/9/97/PLC_M221.png/600px-PLC_M221.png||height="353" width="600"]]
382
383 Network Structure
384
385 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]