Chapter 4 Command Set 4-159
4050, 4052, 4053, 4060, 4051, 4055, 4068
Chapter 4
$AA4
Name Read Synchronized Data
Description The addressed digital I/O module is instructed to return the
value that was stored in its register by a Synchronized Sampling
command.
Syntax $AA4(cr)
$ is a delimiter character.
AA (range 00-FF) represents the 2-character hexadecimal
address of the digital I/O module who’s data is to be returned.
4 is the Read Synchronized Data command.
(cr) is the terminating character, carriage return (0Dh).
Response !(status)(dataOutput)(dataInput)00(cr)
if the command was valid. (ADAM-4050)
!(status)(dataInput)0000(cr)
if the command was valid. (ADAM-4052)
!(status)(dataInput)(dataInput)00(cr)
if the command was valid. (ADAM-4053)
!(status)(dataOutput)0000(cr)
if the command was valid. (ADAM-4060/4068)
?AA(cr) if an invalid command has been issued.
There is no response if the module detects a syntax error or
communication error or if the specified address does not exists.
!
delimiter character indicating a valid command was received
?
delimiter character indicating the command was invalid
AA (range 00-FF) represents the 2-character hexadecimal
address of the digital I/O module that is responding.
(status) will tell you if the data (data) from the last Synchronized
Sampling command (#**) has already been sent. If (status=1),
then data has been sent for the first time after an Synchronized
Sampling command was issued. If (status=0), then the data has
been sent at least once after a Synchronized Sampling command
was issued.
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