Pelco cm6800-322x6 User Manual
30
C1522M-C (2/05)
Connecting the Open Collector output – F2 (TTL)
F2 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 24 for wiring details.
control higher voltage control inputs via isolation relays. Refer to Figure 24 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 24.
Figure 24. Wiring the F2 (TTL) Output
12-PIN PLUG-IN
CONNECTOR
CONNECTOR
INPUT
FROM VIDEO OUTPUT
LOOPED TO MONITOR
+VDC = VOLTAGE OF THE EXTERNAL POWER SOURCE.
+VDC
R
R = +VDC
25 mA
NOTE:
+VDC SHOULD BE 5V OR GREATER, BUT NOT
EXCEED 15V OR THE MAXIMUM RATED OUTPUT
VOLTAGE FOR THE DEVICE INPUT. +VDC CAN
ONLY BE DC.
EXCEED 15V OR THE MAXIMUM RATED OUTPUT
VOLTAGE FOR THE DEVICE INPUT. +VDC CAN
ONLY BE DC.
DEVICE EXAMPLE: VIDEO PRINTER
20018