Advantech 5000 Series , $aaSi6,

Command Set
5050/5051/5052/5055/5056
5060/5068/5069 Digital I/O
$aaSi6
Name Digital Data In
Description This command requests that the specified module in an
ADAM-5000 system at address aa return the status
of its digital input channels and a read back value of its
digital output channels.
Syntax $aaSi6(cr)
$ is a delimiter character.
aa (range 00-FF) represents the 2-character hexadecimal
address of the ADAM-5000 system.
Si identifies the I/O slot of the system you want to read.
6 is the Digital Data In command.
(cr) is the terminating character, carriage return (0Dh)
Response !aa(datainput)(datainput)00(cr) if the
command is valid.
(ADAM-5051)
!aa(datainput)(dataoutput)00(cr) if the command is valid.
(ADAM-5055S)
!aa(dataoutput)(dataoutput)00(cr) if the command is
valid.
(ADAM-5056)
!aa(dataoutput)0000(cr) if the command is valid.
(ADAM-5060, ADAM-5068, ADAM-5069)
?aa(cr) if an invalid operation was entered.
6-108
ADAM-5000