5½ Digit Multimeter Reference Manual Appendix C: Communication interface
2110-901-01 Rev. C/August 2013 C-5
Figure 47: Keithley Communicator Open Instrument
14. Click OK.
15. Send a command to the instrument and see if it responds.
If you have a full version of NI VISA on your system, you can run NI-MAX or the VISA Interactive
Utility. See their documentation for information.
If you have the Agilent IO Libraries on your system, you can run Agilent Connection Expert to check
out your USB instruments. See their documentation for information.
Pass/fail output from USB connector
The USB connector on the instruments rear panel is a series B connector. When the USB interface is
disabled (IEEE-488 interface is selected), the internal pass and fail TTL output signals (limit testing)
will be transmitted via the USB port.
The pass and fail signals are low true and indicate the Math Pass/Fail Limit Test result for the next
reading to be output to the GPIB interface. The signals are active low for approximately 2ms ( ± 100 μ
sec) for each reading taken. The following figure shows the USB connector (series B).
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