Clear-Com FOR-22 - Manual (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 Output
Audio Input
Relay Normally Closed
Relay Wiper
FOR-22 I/O DB-9M
Logic Input (+/- 4 to 50 V)
1
2
9
8
7
6
5
4
3