© 2007 PANORAMAdtv ALL rights reserved
18
MON2-3W
and
MON2-3/6.8
User Manual P/N
821525 Rev-E
Section 3: Technical Information
Tally Connector Pin Functions
A front panel dual-color
Tally Indication LED
is associated with each LCD display module. Interface is provided to the LEDs via
the
Tally Control Connector
located on the chassis rear panel. The
Tally Indicator LED
s are capable of displaying three colors;
RED, GREEN, and AMBER. Illuminating the RED or GREEN LEDs separately will result in that tally color. Illuminate the RED and
GREEN LEDs simultaneously to achieve a AMBER tally indication in the LED. Note that tally channel
1
(pins 2, 15, 3) is used to
drive the
Tally Display 1
LEDs, while tally channel
3
(pins 8, 21, 9) is used to drive the
Tally Display 2
LEDs. See the diagram
below for tally connector pinouts and LED wiring.
Three examples of tally connection configurations are shown on the facing page. You can operate the
Tally Indication LED
s by
numerous methods. The three tutorial examples showing
dry closure
,
positive true logic drive
, and
open collector
activation are
illustrated to show basic operation. The LEDs interface with TTL levels. You can design illumination circuits as shown, by using
TTL buffers, or by using transistors as switches.
Tally Connector Pin Functions
Tally Control Connections
