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32 Pelco Manual C1515M-A (11/01)
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 26 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.
00618
Figure 25. Wiring the F3 (TTL) Output
Installation:
Auxiliaries