
4000 Digital Series II Issue 1.4 Panel User Guide
STA0380 Page 7
3.2.12 Reply Key
This DAK is designated to respond to any unscheduled calls. The green LED indicator on the REPLY
Key only flashes to signal the presence of an unscheduled call, when a DAK is unavailable, (i.e. to
indicate that the call can only be responded to by the Reply Key).
The Reply Key can only respond to the call mnemonic displayed (or last caller). All other incoming calls
are placed in a queue and have to be accessed in turn. The latest call is placed at the front of the queue.
The maximum number of calls in this queue is ten.
3.2.13 Auxiliary Volume Control
Turn the Auxiliary Volume Control clockwise to increase the auxiliary channel volume, or anti-clockwise
to decrease the volume. The volume level indicator LED changes colour according to the volume setting;
green indicates a low setting, green and orange an intermediate setting and orange a high setting.
The auxiliary channel is not always used.
A panel fitted with a PDE4537 options card can have an external line
level auxiliary input.
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