Chapter 4
Chapter 4 Command Set
4-29
4.4.19
$AA3
Name
Returns the value of the CJC sensor
Description Instructs the analog input module to read its CJC (Cold
Junction Compensation) sensors and to return the acquired
data.
Syntax $AA3(cr)
$ is a delimiter character.
AA (range 00-FF) represents the 2-character hexadecimal
address which contains the CJC Status you wish to retrieve.
3 is CJC Status command.
(cr) is the
terminating character, carriage return (0Dh).
Response >data(cr) if the command is 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.
! is a delimiter character indicating that a valid command
was received.
? is a
delimiter character indicating that the command was
invalid.
AA (range 00-FF) represents the 2-character hexadecimal
address of an analog input module.
(data) is the value that is retrieved by the module by
reading its CJC sensor. The data format, in degrees Celsius,
consists of a “+” or “-” sign followed by five decimal digits
and a fixed decimal point. The resolution of the data is 0.1
o
C.
(cr) is the terminating character, carriage return (0Dh).
Example command: $093(cr)
response: >+0036.8(cr)
The command requests the analog input module at address
09h to read its CJC sensor and to return the data. The
analog input module at address 09h responds with 36.8
o
C.
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