If you are attempting to custom wire a cable to trigger the tally, instead of using
the provided light sensor, the following technical information below will be help-
ful in wiring your cable.
For older Telescript TallyOne units (only Red/Green units), or if your tally system
only outputs On/Off (Red/Green), follow these notes:
The sensor input is a standard 3.5mm phone jack. The sleeve is grounded. The tip
is pulled up to +5 volts by a resistor. The ring is not connected, therefore it does
not matter whether the mating plug is a mono or stereo type. The voltage at the
tip is compared with the setting of the threshold potentiometer between approxi-
mately 0.7 and 4.3 volts. If the tip connection is open or the voltage is above the
threshold setting, the display will be green. If the tip connection is pulled below
the threshold setting or shorted to ground, the display will be red. The tip con-
nection can be driven by a switch or relay contact to ground, a light dependent
resistor to ground, a logic level, or other means.
Each clock or tally has an associated 3.5mm output jack labeled “repeat”. When
the display is green, the output is open circuit. When the display is red, it offers a
Custom Wiring for the ClockOne and TallyOne
