Advantech ADAM 4000 user manual $AA8cr

4021	Chapter 6
$AA8
Name	Current Readback command
Description	The addressed analog output module is instructed to
	measure the current flowing through its current/voltage
	loop and return the measured data in the module’s
	configured data format. The value returned may be a rough
	estimate of the real value.
Syntax	$AA8(cr)
	$ is a delimiter character.
	AA (range 00-FF) represents the 2-character hexadecimal
	address of the analog output module that you want to
	retrieve the data from. The data are current/voltage loop.
	8 is the Current feedback 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 returned by the analog output module.
	(cr) is the terminating character, carriage return (0Dh).
Example	command: $0A8(cr)
	response: !0A18.773(cr)
	The command tells the analog output module at address
	0Ah to measure its current loop and return the measured
	value.
	The analog output module returns the value 18.773 mA.

6-15 ADAM 4000 Series User’s Manual