Last modified by Karry Zhuang on 2024/07/11 11:58
<
From version < 1.12 >
edited by Xiaoling
on 2022/05/12 10:13
To version < 2.1 >
edited by Xiaoling
on 2022/05/12 10:42
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Change comment: Uploaded new attachment "image-20220512104203-1.png", version {1}

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10 10  
11 11  Connection
12 12  
13 +
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  
32 +
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  
56 +(((
54 54  How to connect with Energy Meter：
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55 55  
60 +(((
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.
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57 57  
64 +(((
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+
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61 61  
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62 62  Power Source GND to RS485-LN VIN-
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63 63  
76 +(((
64 64  Once there is power, the RS485-LN will be on.
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65 65  
66 66  [[image:https://wiki.dragino.com/images/thumb/1/15/Meter2.jpg/600px-Meter2.jpg||height="433" width="577"]]
67 67  
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68 68  Connection2
69 69  
70 70  
71 -[[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="763" width="573"]]
85 +[[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="712" width="534"]]
72 72  
73 73  Connection3
74 74  
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124 124  
125 125  (% class="box infomessage" %)
126 126  (((
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
141 + AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
128 128  )))
129 129  
130 130  a: length for the return of AT+COMMAND
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154 154  )))
155 155  
156 156  (((
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172 +)))
173 +
174 +(((
157 157  **Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
158 158  )))
159 159  
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288 288  
289 289  DOWNLINK
290 290  
309 +
291 291  [[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
292 292  
293 293  DOWNLINK
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295 295  
296 296  === 1.3.4 How to configure and output commands for RS485 to USB ===
297 297  
317 +(((
298 298  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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299 299  
321 +(((
300 300  First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
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301 301  
325 +(((
302 302  Open the serial port debugging, set the send and receive to HEX.
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303 303  
329 +(((
304 304  Baud rate: 9600
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305 305  
333 +(((
306 306  check digit: Even
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307 307  
308 -[[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="800" width="600"]]
337 +[[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="725" width="544"]]
309 309  
310 310  USB
311 311  
312 -[[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="800" width="600"]]
313 313  
342 +[[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="728" width="546"]]
343 +
314 314  USB
315 315  
346 +
347 +(((
316 316  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.
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317 317  
318 -Example:input：01 03 00 31 00 02 95 c4
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352 +**Example:**  input：01 03 00 31 00 02 95 c4
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319 319  
320 -{{{ output:01 03 04 00 00 00 42 7A 02
321 -}}}
355 +(((
356 + output:01 03 04 00 00 00 42 7A 02
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322 322  
323 323  [[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
324 324  
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328 328  
329 329  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.
330 330  
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368 +(((
331 331  Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
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371 +)))
332 332  
333 333  [[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
334 334  
335 -Example:These two meters are examples of setting parameters and device addresses.
375 +**Example**:These two meters are examples of setting parameters and device addresses.
336 336  
337 -[[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="800" width="600"]]
377 +[[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="737" width="553"]]
338 338  
339 -[[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="800" width="600"]]
379 +[[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="733" width="550"]]
340 340  
381 +(((
382 +(((
341 341  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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342 342  
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343 343  We can use AT+CFGDEV to set the device address.
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344 344  
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345 345  We modify the device address 01 of the first energy meter to 02.
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397 +)))
346 346  
347 347  [[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
348 348  
image-20220512104203-1.png
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