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Version 1.5 by Xiaoling on 2022/05/12 09:53
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Xiaoling 1.2 1 = 1. Introduction =
Xiaoling 1.1 2
Xiaoling 1.2 3 This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
Xiaoling 1.1 4
Xiaoling 1.2 5 == 1.1 Example 1: Connect to Leak relay and VFD ==
Xiaoling 1.1 6
Xiaoling 1.2 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:
Xiaoling 1.1 8
Xiaoling 1.3 9 [[image:https://wiki.dragino.com/images/thumb/5/5c/RS485_01.png/600px-RS485_01.png||height="297" width="534"]]
Xiaoling 1.1 10
Xiaoling 1.2 11 Connection
Xiaoling 1.1 12
Xiaoling 1.3 13 [[image:https://wiki.dragino.com/images/thumb/f/f2/RS485_02.png/600px-RS485_02.png||height="743" width="528"]](% style="display:none" %)
Xiaoling 1.1 14
Xiaoling 1.2 15 Connection
Xiaoling 1.1 16
Xiaoling 1.2 17 Related documents:
Xiaoling 1.1 18
Xiaoling 1.2 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]]
Xiaoling 1.1 22
23
Xiaoling 1.2 24 == 1.2 Example 2: Connect to Pulse Counter ==
Xiaoling 1.1 25
Xiaoling 1.2 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:
Xiaoling 1.1 27
Xiaoling 1.2 28 [[image:https://wiki.dragino.com/images/thumb/3/34/RS485_02_1.png/600px-RS485_02_1.png||height="364" width="600"]]
Xiaoling 1.1 29
Xiaoling 1.2 30 Connection
Xiaoling 1.1 31
Xiaoling 1.2 32 [[image:https://wiki.dragino.com/images/thumb/5/5f/RS485_02_2.png/600px-RS485_02_2.png||height="337" width="600"]]
33
34 Connection
35
36 * [[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
37 * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
38
39
40 == 1.3 Example3: Use RS485-LN with energy meters ==
41
42 === 1.3.1 OverView ===
43
Xiaoling 1.5 44 (((
Xiaoling 1.2 45 Note：The specifications of each energy meter are different, please refer to your own energy meter specifications.
Xiaoling 1.5 46 )))
Xiaoling 1.2 47
Xiaoling 1.5 48 (((
Xiaoling 1.2 49 This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
Xiaoling 1.5 50 )))
Xiaoling 1.2 51
52 [[image:https://wiki.dragino.com/images/thumb/f/f4/Meter1.jpg/600px-Meter1.jpg||height="800" width="600"]]
53
54 Connection1
55
56 How to connect with Energy Meter：
57
58 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.
59
60 The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
61
62 Power Source VIN to RS485-LN VIN+
63
64 Power Source GND to RS485-LN VIN-
65
66 Once there is power, the RS485-LN will be on.
67
68 [[image:https://wiki.dragino.com/images/thumb/1/15/Meter2.jpg/600px-Meter2.jpg||height="450" width="600"]]
69
70 Connection2
71
72 [[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="800" width="600"]]
73
74 Connection3
75
76
77 === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
78
79 If the user needs to read the parameters of the electric energy meter and use the modbus command,
80
81 please refer to the appendix of the MODBUS communication protocol in the user manual of the energy meter.
82
83 [[image:https://wiki.dragino.com/images/thumb/3/35/Meter4.png/600px-Meter4.png||alt="Meter4.png" height="193" width="600"]]
84
85 Example:AT+COMMAND1=01 03 00 00 00 01 84 0A
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 How to parse the reading of the return command of the parameter：
94
95 Example:RETURN1：01 03 02 08 FD 7E 05
96
97 * The first byte ARD: slave address code (=001～254)
98 * The second byte: Return to read function code
99 * 3rd byte: total number of bytes
100 * 4th～5th bytes: register data
101 * The 6th and 7th bytes: CRC16 checksum
102 * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
103
104
105 === 1.3.3 How to configure RS485-LN and parse output commands ===
106
107 RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
108
109 ==== via AT COMMAND: ====
110
111 First, we can use AT+CFGDEV to get the return value, and we can also judge whether the input parameters are correct.
112
113 If the configured parameters and commands are incorrect, the return value is not obtained.
114
115 [[image:https://wiki.dragino.com/images/b/bc/AT_COMMAND1.png||height="358" width="456"]]
116
117 AT COMMAND
118
119 AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
120
121 a: length for the return of AT+COMMAND
122
123 b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
124
125 c: define the position for valid value.
126
127 [[image:https://wiki.dragino.com/images/7/7d/AT_COMMAND2.png||height="278" width="477"]]
128
129 AT COMMAND
130
131 PAYLOAD is available after the valid value is intercepted.
132
133 [[image:https://wiki.dragino.com/images/3/3a/AT_COMMAND4.png||height="219" width="576"]]
134
135 AT COMMAND
136
137 You can get configured PAYLOAD on TTN.
138
139 [[image:https://wiki.dragino.com/images/thumb/c/c2/AT_COMMAND3.png/600px-AT_COMMAND3.png||height="138" width="600"]]
140
141 AT COMMAND
142
143 Example: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
144
145 RETURN1:01 03 02 00 02 39 85 00 00(return data)
146
147 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.
148
149 CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
150
151 RETURN2:01 03 02 08 DC BE 1D(return data)
152
153 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.
154
155 CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
156
157 RETURN3:01 03 04 00 00 00 44 FA 00(return data)
158
159 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.
160
161 Payload:01 00 02 39 85 08 DC 00 00 00 44
162
163 [[image:https://wiki.dragino.com/images/thumb/9/9b/AT_COMMAND10.png/600px-AT_COMMAND10.png||height="278" width="600"]]
164
165 AT COMMAND
166
167 01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.
168
169 [[~[~[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]]
170
171 AT COMMAND
172
173 ==== 1.3.3.1 via LoRaWAN DOWNLINK ====
174
175 [[image:https://wiki.dragino.com/images/thumb/f/fc/DOWNLINK_METER1.png/600px-DOWNLINK_METER1.png||height="423" width="600"]]
176
177 DOWNLINK
178
179 Type Code 0xAF
180
181 0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
182
183 Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
184
185 Format: AF MM NN LL XX XX XX XX YY
186
187 Where:
188
189 MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
190
191 NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
192
193 LL: The length of AT+COMMAND or AT+DATACUT command
194
195 XX XX XX XX: AT+COMMAND or AT+DATACUT command
196
197 YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
198
199 will execute an uplink after got this command.
200
201 Example:
202
203 AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
204
205 [[image:https://wiki.dragino.com/images/thumb/4/45/DOWNLINK_METER2.png/600px-DOWNLINK_METER2.png||height="208" width="600"]]
206
207 DOWNLINK
208
209 [[~[~[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]]
210
211 DOWNLINK
212
213 [[image:https://wiki.dragino.com/images/thumb/2/27/DOWNLINK_METER4.png/600px-DOWNLINK_METER4.png||height="210" width="600"]]
214
215 DOWNLINK
216
217 [[~[~[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]]
218
219 DOWNLINK
220
221 [[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
222
223 DOWNLINK
224
225
226 === 1.3.4 How to configure and output commands for RS485 to USB ===
227
228 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.
229
230 First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
231
232 Open the serial port debugging, set the send and receive to HEX.
233
234 Baud rate: 9600
235
236 check digit: Even
237
238 [[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="800" width="600"]]
239
240 USB
241
242 [[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="800" width="600"]]
243
244 USB
245
246 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.
247
248 Example:input：01 03 00 31 00 02 95 c4
249
250 {{{ output:01 03 04 00 00 00 42 7A 02
251 }}}
252
253 [[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
254
255 USB
256
257 === 1.3.5 How to configure multiple devices and modify device addresses ===
258
259 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.
260
261 Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
262
263 [[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
264
265 Example:These two meters are examples of setting parameters and device addresses.
266
267 [[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="800" width="600"]]
268
269 [[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="800" width="600"]]
270
271 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.
272
273 We can use AT+CFGDEV to set the device address.
274
275 We modify the device address 01 of the first energy meter to 02.
276
277 [[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
278
279 AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
280
281 * 01:device adaress
282
283 * 10:function code
284
285 * 00 61：Register address
286
287 * 00 01：Number of Registers
288
289 * 02：Number of bytes
290
291 * 00 02：Modified device address
292
293 * 1：Check code
294
295 The device address setting of the energy meter is complete.
296
297 Another energy meter is a single active energy meter with a floating-point format.
298
299 Its default device address is 01, and the following are the parameters for configuring two energy meters.
300
301 [[image:https://wiki.dragino.com/images/1/13/Meter11.png||alt="Meter11.png" height="576" width="379"]]
302
303 [[image:https://wiki.dragino.com/images/thumb/7/7e/Meter12.png/600px-Meter12.png||alt="Meter12.png" height="262" width="600"]]
304
305 PAYLOAD:01 08 DF 43 62
306
307 * 08 DF is the valid value of the meter with device address 02.
308 * 43 62 is the valid value of the meter with device address 01.
309
310
311 == 1.4 Example 4: Circuit Breaker Remote Open Close ==
312
313 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:
314
315 [[image:https://wiki.dragino.com/images/thumb/f/fa/RS485_04_2.png/600px-RS485_04_2.png||height="336" width="600"]]
316
317 Connection
318
319 * [[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
320
321
322 == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
323
324 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:
325
326 * [[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
327
328 * [[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
329
330
331 == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
332
333 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:
334
335 * [[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
336
337
338 == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
339
340 [[image:https://wiki.dragino.com/images/thumb/9/97/PLC_M221.png/600px-PLC_M221.png||height="353" width="600"]]
341
342 Network Structure
343
344 * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]