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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 External Trigger Inputs: With TRIGger:SOURce EXTernal
selected, only one switchbox at a time can use the external trigger
input at the HP E1300/E1301 Mainframe’s "Event In" port. The
trigger input is assigned to the first switchbox requesting the external
trigger source (with a
TRIGger:SOURce EXTernal command).
• Assigning External Trigger: A switchbox assigned with
TRIG:SOUR EXT remains assigned to that source until it receives a
command to change the source to
BUS, HOLD, or IMMediate. When
the source is changed, the external trigger source is available to the
next switchbox which requests it (with a
TRIGger:SOURce
EXTernal
command). If a switchbox requests an external trigger
input already assigned to another switchbox, an error is generated.
• Using Bus Triggers: To trigger the switchbox with
TRIGger:SOURce BUS selected, use 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: [ROUTe:]SCAN, TRIGger, ABORt
• *RST Condition: TRIGger:SOURce IMMediate
Example Scanning Using External Triggers
This example uses external triggering (
TRIG:SOUR EXT) to scan channels
00 through 02 of a single-module switchbox. The trigger source to advance
the scan is the input to the "Event In" port on an HP E1300A/E1301A
mainframe. When
INIT is executed, the scan is started and channel 00 is
closed. Then each trigger received at the "Event In" port advances the scan
to the next channel.
TRIG:SOUR EXT Sets trigger source to external.
SCAN (@100:102) Scan channels 00 through 02.
INIT Begin scan, close channel 00.
trigger externally Advance scan to next channel.
68 HP E1368A/69A/70A Command Reference Chapter 4