Clear-com FOR-22 User Manual download pdf (Page 14)

Vitec Group Communications

FOR-22 Dual 4-Wire Interface Instruction Manual

2-6

Figure 2-4: Pinout of the DB-9M I/O Connectors for FOR-22s

EXTERNAL AUDIO DEVICES

Connect external audio devices to the FOR-22 ports through the two

DB-9M connectors labeled "I/O" on the rear panel assembly panel.

Both audio input and output are transformer isolated. Refer to Figure

2-4 for pinouts.

CALL SIGNAL INPUT

The Call Signal input is used to receive a "call signal" or logic input

from an external device and send it to the matrix. The voltage across

the pins required to receive a call signal ranges from 4 Volts to 50

volts; it can be either positive or negative polarity or AC. The input will

draw between 4 and 8 milliamps. Refer to Figure 2-4 for pinouts.

RELAY CONTACTS

Each FOR-22 channel features a relay that is associated with the

logical "call signal" output of a port. A relay's function depends on the

function assigned to the FOR-22 port in the configuration software. A

relay can be assigned to operate with any label in the system: when

that label is activated (either by a talk, listen, or both as set from the

configuration program), the relay will be activated. Or it can be

assigned to be activated by a call signal, for example to operate a

2-way radio transmitter.

You can use the relay to activate an external device, such as an

applause light in a studio, a cue light, or a security door lock. The

relays feature both "normally open" and "normally closed" contacts.

The contacts are rated at 1 Amp at 24 volts DC; they are not designed

for switching mains AC line voltage. Refer to Figure 2-4 for pinouts.

Audio Input

Logic Input (+/- 4 to 50 V)

Relay Normally Open

Audio Output

Audio Input

Relay Normally Closed

Relay Wiper

FOR-22 I/O DB-9M

Logic Input (+/- 4 to 50 V)

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Clear-com FOR-22 User Manual Page 14