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HOME > SERVICE > Problem > I/O

How to parse DI return instructions

2022-03-31 10:35:49| | 0

  Demonstrate with DAM0404 instruction

  Query optocoupler (4-way optocoupler)

  Send command code: FE 02 00 00 00 04 6D C6

 

QQ截圖20220325145127.png

  Optocoupler return information:

  Return code: FE 02 01 00 91 9C

 QQ截圖20220325145150.png


  For example, the return command query status is FE 02 01 03 D1 9D

  FE is the device address, 02 is the query command, 01 is the number of bytes returned, 03 is the current state, and the last is the check digit.

  03 is the current state:

  03 is hexadecimal data and needs to be converted to binary as 0011

  The state needs to be viewed from right to left,

  0 0 1 1

      圖片7.png

  That is, the first channel and the second channel are currently open.


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