Digital Communication Interface
9.2 Interface
Commands
9
9-3
9.1.3 Serial
Operation
Once the cable has been attached and the interface set up properly, the
controller 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-
face commands are discussed in Section 9.2. All commands are ASCII character
strings terminated with a carriage-return character (CR, ASCII 13).
9.2 Interface
Commands
The various commands for accessing the calibrator functions via the digital
interfaces 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-
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 which 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”<CR> returns the current set-point and “s=150.0”<CR> sets the set-
point to 150.0 degrees.
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