temperatureset-point and view or program the various parameters. The inter-
facecommands are d iscussed in Section 9.2. All commands are ASCII charac-
ter strings terminated with a carriage-return character (CR, ASCII 13).
9.2 Interface Commands
The variouscommands for accessing the calibrator functions via the digital in-
terfacesare 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
minimumnumber of letterswhich determines a unique command. A command
may be used to eitherset a parameter or display a parameter depending on
whether or not a valueis sent with the command following a “=” character. For
example“s”<CR> returns the current set-point and “s=150.0”<CR> sets the
set-pointto 150.0 degrees.
In the followinglist of commands, characters o r data within brackets, “[” and
“]”, are optionalfor thecommand. A slash,“/”, d enotes alternate characters or
data. Numericdata, 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 areignored. Backspace (BS,
ASCII 8) may be used to erase theprevious character. A terminating CR is im-
plied with all commands.
39
9 Digital Communication Interface
Interface Commands