Chapter 4 Command Set 4-137
4021
Chapter 4
$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 of the analog output module who’s data is 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 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 analog output module that is responding.
(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 com-
mand. Either a millimeter or a resistor and voltmeter should be connected
to the module’s output. (See also the analog output module’s Trim Calibra-
tion command and Chapter 5, Calibration, for a detailed description.)
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