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Publication No. 980855 Rev. A 1256 User Manual
EADS North America Test and Services Advanced SCPI Operations 8-7
Now, if the command:
CLOSE (@1(13))
is executed, the following actions occur:
A)
Channel 0 is opened since it is on an exclude list with channel 13
B)
Channels 1, 2, 3, 4, 10, and 12 are opened since they are on an include
list with channel 0
C)
Channel 13 is then closed.
After power-up, and after a “*RST” command has been executed, all EXCLUDE
lists are deleted.
Using External
Triggering
You may provide an
External Trigger In
signal to control when the
1256 closes or opens relays. Also, the 1256 can provide an
External Trigger Out
signal to tell your equipment when the relays
have settled after opening or closing.
These signals connect to the
External Trigger In
and
External
Trigger Out
connectors on the 1256 rear panel. Refer to
Figure 7-
1, Using External Trigger In and External Trigger Out
for
connector location and signal information.
Selecting the
Trigger Source
The TRIGGER:SOURCE command selects which source is used
to trigger the scan list. Each time a trigger is received from the
selected trigger source, the 1256 advances to the next element on
the scan list.
The syntax for the TRIGGER:SOURCE command is:
:TRIGger
[ :SEQuence ]
:SOURce { BUS | HOLD |
IMMediate
|
EXT
}
The possible trigger sources are:
BUS
The GPIB bus trigger, or the “*TRG” command,
advances to the next scan list element.
HOLD
Triggers are ignored, and the scan list will not
advance.
IMMediate
The scan list, once initiated, advances as fast as
possible after considering the relay settling time,
trigger input delay, and trigger output delay. The
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