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8.1.3 Serial Operation
Once the cable has been attached and the interface set up properly the control
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ler immediately begins transmitting temperature readings at the programmed
rate. The serial communications uses 8 data bits, one stop bit, and no parity.
The set-point and other commands may be sent via the serial interface to set the
temperature set-point and view or program the various parameters. The inter
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face commands are discussed in Section 8.2 . All commands are ASCII charac
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ter strings terminated with a carriage-return character (CR, ASCII 13).
8.2 Interface Commands
The various commands for accessing the calibrator functions via the digital in
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terfaces are listed in this section (see Table 2). These commands are used with
the RS-232 serial interface. The commands are terminated with a carriage-re
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turn character. The interface makes no distinction between upper and lower
case letters, hence either may be used. Commands may be abbreviated to the
minimum number of letters that determines a unique command. A command
may be used to either set a parameter or display a parameter depending on
whether or not a value is sent with the command following a “=” character. For
example “s” returns the current set-point and “s=150.0” sets the set-point to
150.0 degrees.
In the following list of commands, characters or data within brackets, “[” and
“]”, are optional for the command. A slash, “/”, denotes alternate characters or
data. Numeric data, denoted by “n”, may be entered in decimal or exponential
notation. Characters are shown in lower case although upper case may be used.
Spaces may be added within command strings and will simply be ignored.
Backspace (BS, ASCII 8) may be used to erase the previous character. A termi-
nating CR is implied with all commands.
33
8 Digital Communication Interface
Interface Commands
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