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Routing the Signal to a Source
The arm signal can be routed to the locations described above, provided the
port or trigger line is not also used as an input for a reference clock source,
arm source, or trigger source. Summarized below are the external sources
available to the digitizer:
External reference clock sources: "Ext 2" BNC port, ECLTRG<n > trigger
line
External arm sources: "Ext 1" BNC port, ECLTRG<n > trigger line,
TTLTRG<n >* trigger line
External trigger sources: "Ext 1" BNC port, "Ext 2" port, ECLTRG<n >
trigger line, TTLTRG<n >* trigger line
If one of these ports or trigger lines is an input source, then that same port
or line cannot be used to route (OUTPut) the signal.
Enabling the Synchronization Signal
In order for the arm synchronization signal to be routed to the "Ext 1" port
or to an ECLTRG or TTLTRG trigger line, the routing must be enabled.
This is done with the commands:
OUTPut:EXTernal[1][:STATe] <
mode
>
OUTPut:ECLTrg<
n
>[:STATe] <
mode
>
OUTPut:TTLTrg<
n
>[:STATe] <
mode
>
For each command, the <mode > settings are:
ON - enables the port or trigger line to route the signal.
OFF - disables the port or trigger line from routing the signal.
Multiple TTLTRG trigger lines are individually enabled or disabled by
executing the OUTP:TTLT<n >:STAT command for each line.
Note The TTLTRG trigger lines are not independent with regard to the
synchronization signal supplied by FEED. This means that all TTLTRG
trigger lines enabled by OUTP:TTLT<n >:STAT will carry the same
synchronization pulse.
120 Understandin
g
the HP E1429 Di
g
itizer Chapter 3