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28
Peripheral Connections
5.2 A 4491/2 MUSIC SOURCE SELECTOR WALL PLATES
The A 4491and A 4492 wall plates allow remote selection of the zone’s input audio source and volume level.
In addition, when connected to the A 4478 or A 4479 local zone input wallplate, it allows the use of a local signal source,
such as a wired mic, radio mic or aux source, which VOX mutes the selected input from the A 4480.
The LCD displays the zone name, the input sources and zone and local input volume levels.
Note:
The volume controls only adjust the volume of the 8 aux input sources, plus the local input (when used).
General and emergency paging from the A 4480 Audio Switcher will override these volume settings.
A 4491/2 Wiring Connections
1
Positive audio connection from A 4478/79 wall plate.
2
Negative audio connection from A 4478/79 wall plate.
3
Ground audio connection from A 4478/79 wall plate.
4
Not Used
5
Not USed
6
DIP Switch (see DIP switch settings for more details).
7
RJ45 connection. (Cat5e provides power to the wallplate and routes local audio (fed from A 4478/79) back to the
A 4480.)
A five way euro block connector is provided for connection to the A 4478 wall plate. But only three of the connections
are required as listed above. It is advisable to use shielded cable for this connection.
5.2.1 Features
• Remote selection of input audio source
• Volume control of zone input
• Volume control of local input
• Mute function
• Personal Identification Number 2 stage Lockout Function
• Zone Lockout
• DIP switch selectable Menu Lockout Function
• Cat5e connection to A 4480
• Provision for input of local microphone or
• Powered from the A 4480
line level audio via A 4478 or A 4479 wall plate
5.2.2 Menu Accessed Features
• Enable/Disable Local Input
• Vox Sensitivity Level Adjustment
• Vox Delay Adjustment
• Disable Input Sources
• Backlight Timeout Adjustment
• Change Pin Number
• Change Zone (Wall plate ID)
• Lock/Unlock Screen
1
4
5
6
7
2
3
1 2 3 4
ON
A 4491
A 4492
Fig 5.2 Rear of plate
