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Summary

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1 +(% class="wikigeneratedid" %)
2 + **Contents:**
3 +
4 +{{toc/}}
5 +
1 1  = 1. Introduction =
2 2  
3 3  This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
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10 10  
11 11  Connection
12 12  
18 +
13 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 14  
15 15  Connection
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28 28  
29 29  Connection
30 30  
37 +
31 31  [[image:https://wiki.dragino.com/images/thumb/5/5f/RS485_02_2.png/600px-RS485_02_2.png||height="337" width="600"]]
32 32  
33 33  Connection
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51 51  
52 52  Connection1
53 53  
61 +(((
54 54  How to connect with Energy Meter：
63 +)))
55 55  
65 +(((
56 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.
67 +)))
57 57  
69 +(((
58 58  The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
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59 59  
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60 60  Power Source VIN to RS485-LN VIN+
75 +)))
61 61  
77 +(((
62 62  Power Source GND to RS485-LN VIN-
79 +)))
63 63  
81 +(((
64 64  Once there is power, the RS485-LN will be on.
83 +)))
65 65  
66 66  [[image:https://wiki.dragino.com/images/thumb/1/15/Meter2.jpg/600px-Meter2.jpg||height="433" width="577"]]
67 67  
68 68  Connection2
69 69  
70 -[[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="800" width="600"]]
71 71  
90 +[[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="712" width="534"]]
91 +
72 72  Connection3
73 73  
74 74  
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89 89  * 5th and 6th bytes: Number of registers to read
90 90  * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
91 91  
112 +(((
92 92  How to parse the reading of the return command of the parameter：
114 +)))
93 93  
94 94  (% class="box infomessage" %)
95 95  (((
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117 117  
118 118  [[image:https://wiki.dragino.com/images/b/bc/AT_COMMAND1.png||height="358" width="456"]]
119 119  
120 -**AT COMMAND**
142 +AT COMMAND
121 121  
122 122  (% class="box infomessage" %)
123 123  (((
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
146 + AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
125 125  )))
126 126  
127 127  a: length for the return of AT+COMMAND
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146 146  
147 147  [[image:https://wiki.dragino.com/images/thumb/c/c2/AT_COMMAND3.png/600px-AT_COMMAND3.png||height="138" width="600"]]
148 148  
171 +(((
149 149  AT COMMAND
173 +)))
150 150  
175 +(((
176 +
177 +)))
178 +
179 +(((
151 151  **Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
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152 152  
183 +(((
153 153  RETURN1:01 03 02 00 02 39 85 00 00(return data)
185 +)))
154 154  
187 +(((
155 155  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.
189 +)))
156 156  
191 +(((
157 157  CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
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158 158  
195 +(((
159 159  RETURN2:01 03 02 08 DC BE 1D(return data)
197 +)))
160 160  
199 +(((
161 161  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.
201 +)))
162 162  
203 +(((
163 163  CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
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164 164  
207 +(((
165 165  RETURN3:01 03 04 00 00 00 44 FA 00(return data)
209 +)))
166 166  
211 +(((
167 167  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.
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168 168  
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169 169  Payload:01 00 02 39 85 08 DC 00 00 00 44
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170 170  
171 171  [[image:https://wiki.dragino.com/images/thumb/9/9b/AT_COMMAND10.png/600px-AT_COMMAND10.png||height="278" width="600"]]
172 172  
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182 182  
183 183  ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
184 184  
185 -[[image:https://wiki.dragino.com/images/thumb/f/fc/DOWNLINK_METER1.png/600px-DOWNLINK_METER1.png||height="423" width="600"]]
233 +[[image:image-20220512104358-3.png]]
186 186  
187 187  (((
188 188  DOWNLINK
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193 193  )))
194 194  
195 195  (((
196 -Type Code 0xAF
244 +**Type Code 0xAF**
197 197  )))
198 198  
199 199  (((
248 +(% class="box infomessage" %)
249 +(((
200 200  0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
201 201  )))
252 +)))
202 202  
203 203  (((
204 204  Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
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263 263  
264 264  DOWNLINK
265 265  
317 +
266 266  [[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
267 267  
268 268  DOWNLINK
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270 270  
271 271  === 1.3.4 How to configure and output commands for RS485 to USB ===
272 272  
325 +(((
273 273  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.
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274 274  
329 +(((
275 275  First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
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276 276  
333 +(((
277 277  Open the serial port debugging, set the send and receive to HEX.
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278 278  
337 +(((
279 279  Baud rate: 9600
339 +)))
280 280  
341 +(((
281 281  check digit: Even
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282 282  
283 -[[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="800" width="600"]]
345 +[[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="725" width="544"]]
284 284  
285 285  USB
286 286  
287 -[[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="800" width="600"]]
288 288  
350 +[[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="728" width="546"]]
351 +
289 289  USB
290 290  
354 +
355 +(((
291 291  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.
357 +)))
292 292  
293 -Example:input：01 03 00 31 00 02 95 c4
359 +(((
360 +**Example:**  input：01 03 00 31 00 02 95 c4
361 +)))
294 294  
295 -{{{ output:01 03 04 00 00 00 42 7A 02
296 -}}}
363 +(((
364 + output：01 03 04 00 00 00 42 7A 02
365 +)))
297 297  
298 298  [[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
299 299  
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303 303  
304 304  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.
305 305  
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376 +(((
306 306  Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
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379 +)))
307 307  
308 308  [[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
309 309  
310 -Example:These two meters are examples of setting parameters and device addresses.
383 +**Example**:These two meters are examples of setting parameters and device addresses.
311 311  
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"]]
385 +[[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="737" width="553"]]
313 313  
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"]]
387 +[[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="733" width="550"]]
315 315  
389 +(((
390 +(((
316 316  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.
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393 +)))
317 317  
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396 +(((
318 318  We can use AT+CFGDEV to set the device address.
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399 +)))
319 319  
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402 +(((
320 320  We modify the device address 01 of the first energy meter to 02.
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405 +)))
321 321  
322 322  [[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
323 323  
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