Installation guide

VAR4 / VAR12 / VAR20 - Product Description
6.4 Serial Ports
6.4.1 Audio-CAN
The Audio-CAN port is a 9-way male D connector for connection to the system Audio-CAN bus that provides
digital communication between the VAR Router, amplifier mainframes, and their associated amplifier
modules and interface cards.
An audio monitor bus ‘daisy-chains’ around the amplifier modules within the system using pins within the
same connectors as the Audio-CAN bus to simplify system wiring. The VAR Router can select an amplifier
output to connect to this bus and the audio level is displayed on the LCD as well as being audible in the VAR
Router loudspeaker.
Pin No. Signal Description
1 NC Not Connected
2 CAN_L CAN Bus Dominant Low
3 GND Common Ground
4 AUDIO MON - Audio Monitor -
5 AUDIO MON + Audio Monitor +
6 NC Not Connected
7 CAN_H CAN Bus Dominant High
8 NC Not Connected
9 NC Not Connected
NC
1 2 3 4 5
6 7 8 9
GNDCAN_L
CAN_H
MALE
AUDIO MON
+-
NC NC NC
6.4.2 RS232 Port
Pin No. Signal Signal
1 NC Not Connected
2 RX
EIA RS232 Received Data
(9600 baud)
3 TX
EIA RS232 Transmitted Data
(9600 baud)
4 DTR
EIA RS232 Data Terminal
Ready
5 GND EIA RS232 Common Ground
6 NC Not Connected
7 RTS EIA RS232 Request To Send
8 CTS EIA RS232 Clear To Send
9 NC Not Connected
1 2 3 4 5
6 7 8 9
NCCTSNC
TXNC RX
RTS
MALE
DTR GND
Issue: 03 complete, approved
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