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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.
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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  
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87 87  Connection2
88 88  
89 89  
90 -[[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="712" width="534"]]
71 +[[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="763" width="573"]]
91 91  
92 92  Connection3
93 93  
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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
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
147 147  )))
148 148  
149 149  a: length for the return of AT+COMMAND
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230 230  
231 231  ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
232 232  
233 -[[image:image-20220512104358-3.png]]
214 +[[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**
225 +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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342 342  check digit: Even
343 343  )))
344 344  
345 -[[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="725" width="544"]]
322 +[[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  
349 349  
350 -[[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="728" width="546"]]
327 +[[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="800" width="600"]]
351 351  
352 352  USB
353 353  
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361 361  )))
362 362  
363 363  (((
364 - output：01 03 04 00 00 00 42 7A 02
341 + output:01 03 04 00 00 00 42 7A 02
365 365  )))
366 366  
367 367  [[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
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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  
375 375  (((
376 -(((
377 377  Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
378 378  )))
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.
358 +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"]]
360 +[[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  
387 387  [[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="733" width="550"]]
388 388  
389 389  (((
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.
392 392  )))
393 -)))
394 394  
395 395  (((
396 -(((
397 397  We can use AT+CFGDEV to set the device address.
398 398  )))
399 -)))
400 400  
401 401  (((
402 -(((
403 403  We modify the device address 01 of the first energy meter to 02.
404 404  )))
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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