BNC 645 - Manual (Page 73)

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Slope to toggle between rising edge trigger and falling edge
trigger.
2. Press DONE to finish the setting.
Remote interface operation
TRIGger:SLOPe {POSitive|NEGative}
Software Triggering
In software triggering, a bus command is sent through the remote
interface to trigger the waveform generator. The waveform generator
outputs a burst or a sweep when it receives one such command. The
operation is similar to the Trigger button on the front panel for manual
triggering.
Remote interface operation
To trigger the waveform generator from the remote interface, choose
BUS as the trigger source:
TRIGger:SOURCe BUS
and send one of the following commands to trigger:
*TRG
TRIGger
External Triggering
An external signal is applied at the Ext Trig connector on the rear panel
in the following five operation modes:
• Externally-modulated FSK mode: The carrier frequency is
outputted when a logic low level is present at the connector, and
the hop frequency is outputted when a logic high level is present.
The maximum shifting rate is 100 kHz.
• Triggered sweep mode: The waveform generator outputs a
sweep on the specified edge each time a TTL pulse is received at
the Ext Trig connector.
• Triggered burst mode: The waveform generator outputs a burst
each time a TTL pulse with specified polarity is received at the Ext
Trig connector.
• External gated burst mode: The waveform generator outputs a
continuous waveform when the external signal is true. When the
external signal turns false, the waveform generator completes the