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1
Changing the
Primary GPIB
Address
You can set the mainframe’s primary GPIB address to any integer value
between 0 and 30. The address is set to 9 at the factory. (See Chapter 2 for
instructions on setting/reading the GPIB address from the front panel.) The
following command sets the mainframe’s primary GPIB address to 12.
SYST:COMM:GPIB:ADDR 12
1
Synchronizing
Internal and
External
Instruments
The mainframe’s Trig Out and Event In ports allow you to synchronize external
equipment to instruments operating within the mainframe. The Trig Out port
allows an instrument in the mainframe to output a negative-going pulse to
indicate the occurrence of some event such as a multiplexer channel closure.
The signal levels are standard TTL (0V to 5V). You direct the pulse from the
appropriate instrument to the Trig Out port by sending the OUTP:STAT ON
command to that instrument.
The Event In port allows an instrument in the mainframe to be armed or
triggered from an external negative-going signal. The signal levels are standard
TTL (0V to 5V). Send the ARM:SOUR:EXT command or the
TRIG:SOUR:EXT command to an instrument to direct the signal on the Event
In port to that instrument.
The following examples use an external Agilent 3457A Multimeter and an
internal Agilent E1345A 16-Channel Multiplexer to demonstrate the use of the
Trig Out and Event In ports.
Figure 4-2. Pacer Trigger States
Using the Mainframe 4-3