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34 C1528M-F (6/05)
Connecting the Open Collector Output – F3 (TTL)
F3 is a TTL open collector output. This output provides a path to ground to control the low voltage trigger input on many devices. It can control
higher voltage control inputs via isolation relays. Refer to Figure 27 for wiring details.
Do not exceed the voltage and current ratings for the TTL output.
An external pull-up resistor is usually necessary. The formula for calculating the resistor value is given in Figure 26.
Figure 27. Wiring the F3 (TTL) Output
12-PIN PLUG-IN
CONNECTOR
FROM VIDEO OUTPUT
LOOPED TO MONITOR
DEVICE EXAMPLE: VIDEO PRINTER
+VDC
25 mA
+VDC
R=
R
INPUT
+VDC = VOLTAGE OF THE EXTERNAL POWER SOURCE.
NOTE:
+VDC SHOULD BE 5V OR GREATER, BUT NOT
EXCEED 15V OR TE MAXIMUM RATED OUTPUT
VOLTAGE FOR THE DEVICE INPUT. +VDC CAN
ONLY BE DC.
CONTROL