Keithley 2750 User Manual page 329

12-6 Common Commands
2.
3.
NOTE
G *TRG — trigger
Use the *TRG command to issue a GPIB trigger to Model 2750. It has the same effect as a
group execute trigger (GET).
Use the *TRG command as an event to control operation. Model 2750 reacts to this trigger
if BUS is the programmed arm control source. The control source is programmed from the
TRIGger subsystem.
NOTE
Programming example — The following command sequence configures Model 2750 to
be controlled by bus triggers. The last line, which sends a bus trigger, triggers one mea-
surement. Each subsequent bus trigger will also trigger a single measurement.
*RST
TRIG:SOUR BUS
TRIG:COUN INF
INIT
*TRG
H *TST? — self-test query
Use this query command to perform a checksum test on ROM. The command places the
coded result (0 or 1) in the output queue. When Model 2750 is addressed to talk, the coded
result is sent from the output queue to the computer.
A returned value of zero (0) indicates that the test passed, and a value of one (1) indicates
that the test failed.
I *WAI — wait-to-continue
Description
Two types of device commands exist:
•
•
Use the *WAI command to suspend the execution of subsequent commands until the
device operations of all previous Overlapped commands are finished. The *WAI command
is not needed for Sequential commands.
Cancels all pending commands.
Cancels response to any previously received *OPC and *OPC? commands.
For RS-232 operation (and in some cases, GPIB operation), *OPC or *OPC?
should be used with *RST, which is a slow responding command. Details on
*OPC and *OPC? are provided in this section.
Details on triggering are provided in
Sequential commands – A command that allows operations to finish before the next
command is executed.
Overlapped commands – A command that allows the execution of subsequent com-
mands while device operations of the Overlapped command are still in progress.
Model 2750 Multimeter/Switch System User's Manual
Send bus trigger to Model 2750
Section 8.
' Restore RST defaults.
' Select BUS control source.
' Set trigger layer count to infinity.
' Take 2750 out of idle.
' Trigger one measurement.
Run self test and read result
Prevent execution of commands until previ-
ous commands are completed