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Interface Commands
The various commands for accessing the bath controller functions via the digital
interfaces are listed in this section (see Table 2). These commands are used with
both the RS-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 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> will return the
current set-point and "s=50.00"<CR> will set the set-point to 50.00 degrees.
In the table 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 are ignored. Backspace (BS,
ASCII 8) may be used to erase the previous character. A terminating CR is
implied with all commands.
Command Description
Display Temperature
Read current set-point
Set current set-point to n
Read vernier
Set vernier to n
Read temperature
Read temperature units
Set temperature units:
Set temperature units to
Celsius
Set temperature units to
Fahrenheit
Secondary Menu
Read proportional band
setting
Set proportional band to n
Read cutout setting
Set cutout setting:
Table 2. Interface Command Summary
Command
Command Format
Example
s[etpoint]
s
s[etpoint]=n
s=450
v[ernier]
v
v[ernier]=n
v=.00001
t[emperature]
t
u[nits]
u
u[nits]=c/f
u[nits]=c
u=c
u[nits]=f
u=f
pr[op-band]
pr
pr[op-band]=n
pr=8.83
c[utout]
c
c[utout]=n/r[eset]
Returned
Returned
Example
set: 9999.99 {C or F}
set: 150.00 C
v: 9.99999
v: 0.00000
t: 9999.99 {C or F}
t: 55.69 C
u: x
u: C
pb: 999.9
pb: 15.9
c: 9999 {x},{xxx}
c: 620 C, in
Calibration Bath
Digital Communication Interface
Acceptable
Values
Instrument
Range
Depends on
Con-
figuration
C or F
Depends on
Con-
figuration
47
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