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:SOURce TRIGger:SOURce BUS | DBUS | EXTernal | HOLD | IMMediate specifies
the trigger source to advance the channel list during scanning.
Parameters
Parameter Name Parameter Type Range of Values
BUS Discrete *TRG command
DBUS Discrete Digital Bus
EXTernal Discrete Event In port
HOLD Discrete Hold Triggering
IMMediate Discrete Continuous Triggering
Comments • Enabling the Trigger Source: The TRIGger:SOURce command
only selects the trigger source. The
INITiate[:IMMediate] command
enables the trigger source.
• Using the TRIG Command: You can use TRIGger[:IMMediate] to
advance the scan when
TRIGger:SOURce BUS or TRIGger:SOURce
HOLD
is selected.
• Using Digital Bus Trigger: TRIGger:SOURce DBUS selects the
digital bus on the multiplexer as the trigger. Any open collector TTL
trigger source can be wired to the "Channel Advance" lead. A
negative-going pulse triggers the multiplexer and advances it to the
next channel on the scanning list. After the
SETTling:TIME delay,
the multiplexer asserts "Channel Closed" on the digital bus.
• Using External Trigger Inputs: With TRIGger:SOURce EXTernal
selected, only one switchbox at a time can use the external trigger
input at the HP E1300A/E1301A Mainframe’s "Event In" port. The
trigger input is assigned to the first switchbox requesting the external
trigger source.
• Assigning External Trigger: A switchbox assigned with
TRIG:SOUR EXT remains assigned to that source until the switchbox
receives a command to change the source. When the source is
changed, the external trigger source is available to another switchbox
(with a
TRIGger:SOURce EXTernal command). Another switchbox
cannot receive an external trigger source if the source is already
assigned, or an error is generated.
• Using Bus Triggers: To trigger the switchbox with
TRIGger:SOURce BUS selected, use TRIGger[:IMMediate], the IEEE
488.2 common command
*TRG or the HP-IB Group Execute Trigger
(
GET).
• "Trig Out" Port Shared by Switchboxes: See the OUTPut
command.
• Related Commands: ABORt, [ROUTe:]SCAN, SETTling[:TIME],
TRIGger
• *RST Condition: TRIGger:SOURce IMMediate
74 HP E1351A/53A 16-Channel FET Multiplexer Command Reference Chapter 5