Toa VS-900 - Manual (Page 38)

38
12.9. VS-900AF Audio Function Card Connection
12.9.1. Amplifier and VS-900AF connection
Paging can be provided through connected external amplifiers using the VS-900AF.
[Connection]
To connect the amplifier to the VS-900AF, use a twisted pair cable for audio output, and a twisted pair cable
for control output. The audio output is 0 dB* and of unbalanced type. The control output is an open collector
output of 20 mA, 24 V DC max., and permits connection of up to 16 channels. Connect as shown below.
* 0 dB = 1 V
External amplifier and VS-900AF connection
To audio input (HOT)
To audio input (GND)
1 twisted pair cable
1 twisted pair cable
To start input (HOT)
To start input (GND)
VS-900AF
CN4
CN5
CN7
CN8
CN6
Audio output
Control output 1
Control output 2
Control output 3
Control output 4
Control output 9
Control output 10
Control output 11
Control output 12
Control output 5
Control output 6
Control output 7
Control output 8
Control output 13
Control output 14
Control output 15
Control output 16
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
Amplifier(1)
Amplifier(2)
Amplifier(15)
Amplifier(16)
Front view of
the circuit board