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Logic Analyzer Reference
The Analyzer Trigger Menu
Arming Control field
Arming Control sets up the order of triggering for complicated
measurements involving more than one machine. You can set the logic
analyzer to begin running when it receives a signal from an external
machine, have one analyzer start the other, or have one analyzer send a
signal to another external machine. The default configuration has both
analyzers running independently without external communications.

Arming control between analyzers

If both analyzers are turned on, you can configure one analyzer to arm
the other. When you select the analyzer name in the Arming Control
menu, a pop-up menu for selecting where the Arm In signal is coming
from appears. This pop-up menu also selects the sequence level in
which an "arm" flag is placed.
When an analyzer receives an Arm In signal, the arm term in the user-
selected sequence level becomes true. If the analyzer was waiting at a
trigger sequence level for the arm term, the analyzer begins evaluating
the rest of that sequence level. However, if the arm term is not part of
the current sequence level, the preceding sequencing could trigger the
analyzer before the arm term is seen. Generally, the arm term is
evaluated and used the same as the other resource terms within the
sequence instruction.

Arming control using external BNCs

A more complex arming example involves passing arm signals in and
out through the External BNCs on the rear panel. In the Arming
Control menu, the External Triggers are called "Port In" and "Port Out".
“PORT IN” can be selected in the Arming Control menu for the
analyzer, scope or pattern generator, and “PORT OUT” can be selected
in the Port Out key for the modules.