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1 -(% class="wikigeneratedid" %)
2 - **Contents:**
3 -
4 -{{toc/}}
5 -
6 6  = 1. Introduction =
7 7  
8 8  This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
... ... @@ -15,7 +15,6 @@
15 15  
16 16  Connection
17 17  
18 -
19 19  [[image:https://wiki.dragino.com/images/thumb/f/f2/RS485_02.png/600px-RS485_02.png||height="743" width="528"]](% style="display:none" %)
20 20  
21 21  Connection
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34 34  
35 35  Connection
36 36  
37 -
38 38  [[image:https://wiki.dragino.com/images/thumb/5/5f/RS485_02_2.png/600px-RS485_02_2.png||height="337" width="600"]]
39 39  
40 40  Connection
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58 58  
59 59  Connection1
60 60  
61 -(((
62 62  How to connect with Energy Meter：
63 -)))
64 64  
65 -(((
66 66  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 -)))
68 68  
69 -(((
70 70  The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
71 -)))
72 72  
73 -(((
74 74  Power Source VIN to RS485-LN VIN+
75 -)))
76 76  
77 -(((
78 78  Power Source GND to RS485-LN VIN-
79 -)))
80 80  
81 -(((
82 82  Once there is power, the RS485-LN will be on.
83 -)))
84 84  
85 85  [[image:https://wiki.dragino.com/images/thumb/1/15/Meter2.jpg/600px-Meter2.jpg||height="433" width="577"]]
86 86  
87 87  Connection2
88 88  
70 +[[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="800" width="600"]]
89 89  
90 -[[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="712" width="534"]]
91 -
92 92  Connection3
93 93  
94 94  
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109 109  * 5th and 6th bytes: Number of registers to read
110 110  * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
111 111  
112 -(((
113 113  How to parse the reading of the return command of the parameter：
114 -)))
115 115  
116 116  (% class="box infomessage" %)
117 117  (((
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139 139  
140 140  [[image:https://wiki.dragino.com/images/b/bc/AT_COMMAND1.png||height="358" width="456"]]
141 141  
142 -AT COMMAND
120 +**AT COMMAND**
143 143  
144 144  (% class="box infomessage" %)
145 145  (((
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
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
147 147  )))
148 148  
149 149  a: length for the return of AT+COMMAND
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168 168  
169 169  [[image:https://wiki.dragino.com/images/thumb/c/c2/AT_COMMAND3.png/600px-AT_COMMAND3.png||height="138" width="600"]]
170 170  
171 -(((
172 172  AT COMMAND
173 -)))
174 174  
175 -(((
176 -
177 -)))
178 -
179 -(((
180 180  **Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
181 -)))
182 182  
183 -(((
184 184  RETURN1:01 03 02 00 02 39 85 00 00(return data)
185 -)))
186 186  
187 -(((
188 188  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 -)))
190 190  
191 -(((
192 192  CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
193 -)))
194 194  
195 -(((
196 196  RETURN2:01 03 02 08 DC BE 1D(return data)
197 -)))
198 198  
199 -(((
200 200  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 -)))
202 202  
203 -(((
204 204  CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
205 -)))
206 206  
207 -(((
208 208  RETURN3:01 03 04 00 00 00 44 FA 00(return data)
209 -)))
210 210  
211 -(((
212 212  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.
213 -)))
214 214  
215 -(((
216 216  Payload:01 00 02 39 85 08 DC 00 00 00 44
217 -)))
218 218  
219 219  [[image:https://wiki.dragino.com/images/thumb/9/9b/AT_COMMAND10.png/600px-AT_COMMAND10.png||height="278" width="600"]]
220 220  
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230 230  
231 231  ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
232 232  
233 -[[image:image-20220512104358-3.png]]
185 +[[image:https://wiki.dragino.com/images/thumb/f/fc/DOWNLINK_METER1.png/600px-DOWNLINK_METER1.png||height="423" width="600"]]
234 234  
235 235  (((
236 236  DOWNLINK
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241 241  )))
242 242  
243 243  (((
244 -**Type Code 0xAF**
196 +Type Code 0xAF
245 245  )))
246 246  
247 247  (((
248 -(% class="box infomessage" %)
249 -(((
250 250  0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
251 251  )))
252 -)))
253 253  
254 254  (((
255 255  Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
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314 314  
315 315  DOWNLINK
316 316  
317 -
318 318  [[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
319 319  
320 320  DOWNLINK
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322 322  
323 323  === 1.3.4 How to configure and output commands for RS485 to USB ===
324 324  
325 -(((
326 326  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.
327 -)))
328 328  
329 -(((
330 330  First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
331 -)))
332 332  
333 -(((
334 334  Open the serial port debugging, set the send and receive to HEX.
335 -)))
336 336  
337 -(((
338 338  Baud rate: 9600
339 -)))
340 340  
341 -(((
342 342  check digit: Even
343 -)))
344 344  
345 -[[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="725" width="544"]]
283 +[[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="800" width="600"]]
346 346  
347 347  USB
348 348  
287 +[[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="800" width="600"]]
349 349  
350 -[[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="728" width="546"]]
351 -
352 352  USB
353 353  
354 -
355 -(((
356 356  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 -)))
358 358  
359 -(((
360 -**Example:**  input：01 03 00 31 00 02 95 c4
361 -)))
293 +Example:input：01 03 00 31 00 02 95 c4
362 362  
363 -(((
364 - output：01 03 04 00 00 00 42 7A 02
365 -)))
295 +{{{ output:01 03 04 00 00 00 42 7A 02
296 +}}}
366 366  
367 367  [[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
368 368  
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372 372  
373 373  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.
374 374  
375 -(((
376 -(((
377 377  Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
378 -)))
379 -)))
380 380  
381 381  [[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
382 382  
383 -**Example**:These two meters are examples of setting parameters and device addresses.
310 +Example:These two meters are examples of setting parameters and device addresses.
384 384  
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"]]
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"]]
386 386  
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"]]
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"]]
388 388  
389 -(((
390 -(((
391 391  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.
392 -)))
393 -)))
394 394  
395 -(((
396 -(((
397 397  We can use AT+CFGDEV to set the device address.
398 -)))
399 -)))
400 400  
401 -(((
402 -(((
403 403  We modify the device address 01 of the first energy meter to 02.
404 -)))
405 -)))
406 406  
407 407  [[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
408 408  
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