GPS-721 User Manual
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GPS-721 User Manual V2.0, Oct. 2010
2.18
@AA
There will be no response if the command syntax is incorrect,
there is a communication error, or there is no module with the
specified address.
Description:
The command is used to read the status of the digital
input/output ports.
Syntax:
@AA[CHKSUM](CR)
@
Delimiter character
AA
Address of the module in hexadecimal format (00
to FF)
Response:
Valid Command:
>(Data)[CHKSUM](CR)
Invalid Command:
?AA[CHKSUM](CR)
>
Delimiter for a valid command.
?
Delimiter for an invalid command.
AA
Address of the module in hexadecimal format (00
to FF)
(Data)
The status of the digital input/output ports as a
four-digit hexadecimal value
The highest byte represents Digital Output and
the last byte is reserved
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