Advantech ADAM 4000 user manual Last Value Readback command

4021	Analog Output Module Command Set
$AA6
Name	Last Value Readback command
Description	The analog output module is instructed to return the latest
	output value that it has received from the Analog Data Out
	command. If the module hasn’t received any Analog Data
	Out commands since startup, it will return to its Start-up
	Output value.
Syntax	$AA6(cr)
	$ is a delimiter character.
	AA (range 00-FF) represents the 2-character hexadecimal
	address whose value you want to return.
	6 is the Last Value Readback command.
	(cr) is the terminating character, carriage return (0Dh).
Response	!AA(data)(cr) if the command was valid.
	?AA(cr) if an invalid command was issued.
	There is no response if the module detects a syntax or
	communication error, or even if the specified address does
	not exist.
	! delimiter character indicates that a valid command was
	received.
	? delimiter character indicates that the command was
	invalid.
	AA (range 00-FF) represents the 2-character hexadecimal
	address of the analog output module.
	(data) is the value that is returned by the analog output
	module. The format of the data depends on the module’s
	configured data format.
	(cr) is the terminating character, carriage return (0Dh).
Example	command: $0A6(cr)
	response: !0A03.000(cr)
	The command requests the analog output module at address
	0Ah to return the last output value that it has received from
	an Analog Out command.
	The analog output module returns the value 3.000 mA.

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