DNF Controls Universal Switch Panel (USP-8, USP-8D, & USP-16) - Manual (Page 7)

Universal Switch Panel (USP) User Manual 5 OF 41
B. REAR PANEL GPO
Each GPO contact closure is a single pole, single throw relay. The GPO connector
on the rear of the USP provides access to the relay contacts, Common and
Normally Open (N.O.), providing isolation between outputs. A common bus (CB)
is also available to tie one side of the relays to a common ground or voltage.
The operating mode of each GPO can be individually configured to one of the
following modes:
1. MOMENTARY MODE
The GPO will turn on when its controlling switch is pressed and then
automatically turn off after a preset time. The GPO will not change state
when the switch is released.
2. LATCHING MODE
The GPO will change state when the switch is pressed. If the GPO was OFF, it
will turn ON. If it was ON, it will turn OFF. The GPO will not change state
when the switch is released.
3. FOLLOW MODE
The GPO will turn ON when the controlling switch is pressed and immediately
turn OFF when the switch is released.
4. FLIP FLOP MODE
The FLIP FLOP is a special case of a GPO Radio Group. One switch controls
two GPOs. One GPO is ON while the other GPO is OFF. When the switch is
pressed the GPOs will alternate states, the previously ON GPO will turn OFF
and the previoulsy OFF GPO will turn ON.
5. GROUP MODE
There are 8 GPO groups, RG1 through RG8. A GPO can be a member of only
one group at a time. The group operates in a manner similar to interlocking
mechanical switches― when one switch is pressed, all of the other switches
are released. When any member of the group is turned ON, all of the other
members are immediately and automatically turned OFF. Only one member
of a group can be ON at any time.
C. FRONT PANEL TALLY
The tally is the LCD backlight on the face of the switch. For Tally ON and Tally
OFF states, each tally can be individually configured to be dark, red, green,
amber, flashing red, flashing green, or flashing amber.
The tally can be configured to show the current state of the controlled GPO or
show the current state of a General Purpose Input (GPI) on the rear of the USP.
The GPI is used to monitor the status of an external device. There are 16 GPIs
available on two rear panel connectors. The tally can be assigned to only one
GPI at a time. When the GPI is ON, the tally will turn ON. When the GPI is OFF,
the tally will turn OFF.