Setra System Model 370 - Manual (Page 37)

III.3 RECEIVING DATA FROM THE GAUGE
There are several types of messages which the gauge may send in response
to the various commands.
The immediate response to the PRINT command interrogation is the most
common message. It is a string of characters consisting of the reading on the
display and other information.
The format of that string of characters is shown below:
+ 1 2 3 . 4 5 6 units A OK SEA LEVEL cr lf
G
T
The first character is the sign, next are 7 digits (including the decimal point)
followed by a blank space. Next are six characters, including some spaces,
which signify the engineering units, followed by another space, the symbol
indicating (A)bsolute, (G)auge, or (T)ared pressure, and another space. This
is optionally followed by the OK symbol (if the OK symbol on the display is on),
and optionally followed by SEA LEVEL if in sea level correction mode. The
string is ended with a carriage return and line feed character.
Other potential messages are "UnAbLE", "SET-UP", and "CAL" appearing
in response to the various functions and situations described in other sections
of this guide. See Section 3.10 for an example of the system status message
sent in response to SETUP PRINT.
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