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Last modified by Xiaoling on 2025/04/23 15:57
From version 41.23
edited by Xiaoling
on 2022/06/06 11:10
Change comment: There is no comment for this version
To version 41.28
edited by Xiaoling
on 2022/06/06 11:12
Change comment: There is no comment for this version

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1372 1372  3.3v position: set to compatible with 3.3v I/O.,
1373 1373  )))
1374 1374  
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1375 1375  **+3.3V**: is always ON
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1376 1376  
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1377 1377  **+5V**: Only open before every sampling. The time is by default, it is AT+5VT=0.  Max open time. 5000 ms.
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1378 1378  
1379 1379  
1380 1380  = 4. Case Study =
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1386 1386  
1387 1387  == 5.1 Access AT Command ==
1388 1388  
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1389 1389  RS485-BL supports AT Command set. User can use a USB to TTL adapter plus the 3.5mm Program Cable to connect to RS485-BL to use AT command, as below.
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1390 1390  
1391 1391  [[image:1654135840598-282.png]]
1392 1392  
1393 1393  
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1394 1394  In PC, User needs to set (% style="color:blue" %)**serial tool**(%%)(such as [[putty>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) baud rate to (% style="color:green" %)**9600**(%%) to access to access serial console of RS485-BL. The default password is 123456. Below is the output for reference:
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1395 1395  
1396 1396  [[image:1654136105500-922.png]]
1397 1397  
1398 1398  
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1399 1399  More detail AT Command manual can be found at [[AT Command Manual>>||anchor="H3.5ConfigureRS485-BLviaATorDownlink"]]
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1400 1400  
1401 1401  
1402 1402  == 5.2 Common AT Command Sequence ==
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1421 1421  )))
1422 1422  
1423 1423  
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1424 1424  If device already joined network:
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1425 1425  
1426 1426  (% class="box infomessage" %)
1427 1427  (((
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1460 1460  
1461 1461  (% style="color:red" %)**Note:**
1462 1462  
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1463 1463  (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1464 1464  2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1465 1465  3. Make sure SF / bandwidth setting in LG01/LG02 match the settings of AT+DR. refer [[this link>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/&file=LoRaWAN%201.0.3%20Regional%20Parameters.xlsx]] to see what DR means.
1466 1466  4. The command AT+RX2FQ and AT+RX2DR is to let downlink work. to set the correct parameters, user can check the actually downlink parameters to be used. As below. Which shows the RX2FQ should use 868400000 and RX2DR should be 5
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1467 1467  
1468 1468  [[image:1654136435598-589.png]]
1469 1469