
•
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 "Event In" BNC port. The
trigger input is assigned to the first switchbox that requested the
external trigger source.
•
Assigning External Trigger: A switchbox assigned with
TRIGger:SOURce EXTernal remains assigned at 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 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 the IEEE 488.2 *TRG
command or the HP-IB Group Execute Trigger (GET) command.
•
"Trig Out" Port Shared by Switchboxes: See OUTPut command.
•
Related Commands: [ROUTe:]SCAN, TRIGger, ABORt.
•
*RST Condition: TRIGger:SOURce IMMediate.
Example
Scanning Using External Triggers
In the following example, the trigger input is applied to the HP
E1300/E1301 Mainframe "Event In" BNC port.
TRIG:SOUR EXT
Sets trigger source to external
SCAN (@100:147)
Sets channel list
INIT
Starts scanning cycle
trigger externally
Advances channel list to next
channel
Scanning Using Bus Triggers
TRIG:SOUR BUS
Sets trigger source to external
SCAN (@100:147)
Sets channel list
INIT
Starts scanning cycle
*TRG
Advances channel list to next
channel
:SOURce?
TRIGger:SOURce? returns the current trigger source for the switchbox.
Command returns either BUS, EXT, HOLD, or IMM for trigger sources
BUS, EXTernal, HOLD, or IMMediate, respectively.
Example
Query Trigger Source
TRIG:SOUR EXT
Sets trigger source to external
TRIG:SOUR?
Query trigger source; returns EXT
58 HP E1346A Multiplexer Command Reference
Chapter 5
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