9.3 Interface Commands
The variouscommands for accessing the calibrator functions via the digital in-
terfacesare listed in this section (see Table 2 starting on page 47). These com-
mands are used with both theRS-232 serial interface and the IEEE-488 GPIB
interface.In either case the commands are terminated with a carriage-return
character.The interface makes no distinction between upper and lower case let-
ters, hence either may be used. Commands may be abbreviatedto the minimum
number of letterswhich determines a unique command. A command may be
used to either seta 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=50.00”<CR> sets the set-point to
50.00 degrees.
In the followinglist of commands, characters o r data within brackets, “[” and
“]”, are optionalfor thecommand. A slash, “/”, denotes alternate characters or
data. Numericdata, denoted by “n”, may be entered in decimal or exponential
notation. Spaces may be added within command strings and willsimply be ig-
nored. Backspace (BS, ASCII 8) may be used to erase the previous character.
A terminating CR is implied with all commands.
46 HartScientific
9Digital Communication Interface