Broadcast Tools DSC-20 Manual de Instalação descarregar pdf (Página 25)

Preliminary 8-2002 RSHD Smartcaster Installation Manual

Fig. 3.1. Fan Out (780) card with wiring

For satellite closures.

The engineer wiring the closures to the 780 boards should keep a list of each input from

each service and its function. Example: Input 1 is a local break closure for ABC NEWS.

Now, the closure is wired so that when the tone decoder detects a closure from ABC

NEWS it will close a normally open relay that will make contact with pins 1 and 17 on

the 780 board when it closes. If a closure is wired to input two then the normally open

relay must make contact with pins two and 18 when it closes. Pin 17 is the ground for all

odd-numbered pins and 18 is the ground for all even-numbered pins. There are a total of

16 different inputs for the switcher that can be mapped in the automation program. Pins

19 and 20 have computer voltage and should not be wired at any time, with the exception

of using pin 19 as a voltage reference for pull up resistors.

Pull up resistors may be needed in high RF fields, such as when there is an AM

transmitter nearby. A 10k resistor from each input with common connection to pin 19

should stop electrical noise from triggering false closures. In extreme cases, the engineer

can purchase an opto-isolation kit from us that will effectively isolate the control closures

from the computer. Ask your sales person.

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Broadcast Tools DSC-20 Manual de Instalação Página 25