Advantech ADAM 4000 user manual Stores the current output value of the addressed analog

4021	Analog Output Module Command Set
$AA1
Name	20 mA Calibration command
Description	Stores the current output value of the addressed analog
	output module as 20 mA reference.
Syntax	$AA1(cr)
	$ is a delimiter character.
	AA (range 00-FF) represents the 2-character hexadecimal
	address whose data are to be sent.
	1 is the 20 mA Calibration command.
	(cr) is the terminating character, carriage return (0Dh).
Response	!AA(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 responding 2-character
	hexadecimal address of the analog output module.
	(cr) is the terminating character, carriage return (0Dh).
	Before issuing the 20 mA Calibration command, the analog
	output module should be trimmed to the correct value with
	the Trim Calibration command. A millimeter or a resistor
	and voltmeter should be connected to the module’s output.
	(Please refer to the analog output module’s Trim
	Calibration command and Chapter 8, Calibration, for a
	detailed description.)

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