TR-4800E
Tally Router
Revision 1.1 Page - 15
3.7.2 General Purpose Output Modes
The default state of GPOs is “normally-open” mode with pulse mode disabled. When the GPO is off,
the “A” and “B” contacts are open (normally-open). When the GPO is turned on, the contacts close.
If pulse mode is enabled, the GPO behaves in a one-shot fashion. When the GPO is off, the contacts
are open (normally-open). When the GPO is turned on, the contacts pulse closed for a period of time,
then open again. Pulse mode can be individually enabled for any GPO (see section 3.3) and the pulse
width can be changed between 50 milliseconds, 100 milliseconds, 200 milliseconds, or 300
milliseconds.
Each General Purpose Output can have its logic inverted. This is called “normally-closed” mode. When
placed into “normally-closed” mode, a GPO will have its contacts closed when it is off. When the GPO
is turned on, its contacts will open. If pulse mode is enabled, the GPOs contacts will be normally closed
and will pulse open when it is turned On.
When the unit boots up, all GPOs will default to Off (either normally-open or normally-
closed). The GPO state is not retained on power loss, but the configuration is.
3.7.3 General Purpose Input Modes
The default state of GPIs is “normally-open” mode with edge triggering disabled. When a GPI is not
activated it reports that it is Off. While a GPI is activated by an external voltage source, it reports that it
is On. The GPI reports the level that is applied to its inputs.
Each GPI can be individually set to have edge triggering enabled. When in edge triggering mode, the
GPI turns on and off only when it transitions from an inactive to an active state (rising edge). On the
first rising transition it will turn on, and on the second rising transition it will turn off. The trigger edge
can be changed to the falling edge as well (see section 3.3).
Each GPI can have its logic inverted. This is called “normally-closed” mode. When placed into
“normally-closed” mode, the GPI behaviour is identical except that it reports the opposite On/Off state
as when in the default “normally-open” mode.
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