3.3.2 Receiving a call light signal
If the beltpack receives a call light signal from the party line, the call light will be illuminated.
3.3.3 Calling channel identification
In connection with the call light lamp the channel indicator shows on which channel it receives the call light signal.
If the Talk function of the beltpack is not active on the channel called, then the channel indicator flashes to show this.
Otherwise (with active Talk on the channel called), only the call light lamp flashes.
3.3.4 Buzzer
By programming the beltpack, you can switch in an acoustic signal in addition to the call light signal. This causes a
buzzer in the beltpack to sound if a call light signal is received. The buzzer is not activated in the factory default
setting. If the buzzer is activated and the beltpack receives a call light signal, you can mute the buzzer by pressing the
S-CALL key. The buzzer will sound again with the next call light signal received. Pressing the S-CALL button during a
call light to mute the buzzer does not trigger an S-CALL, but only deactivates the buzzer. It is only if the S-CALL key is
pressed yet again that an S-CALL is sent to the activated channels.
Call light signal on Channel I
3.4 S-CALL key “S”
You can only send an S-CALL to a channel where the Talk function has been activated. If the channel is switched to
“Talk”, the corresponding LED indicator lights up. By pressing the S-CALL key marked “S”, a “Special Call” is generated
and allocated to the channel with the Talk function preselected and sent to it. It switches a relay in the MS-2004
master station and in the IF-2004 2/4-wire interface for the duration of the key-press.
By using the appropriate relay in the MS-2004 master station or IF-2004 4-wire interface, you can, for example, key the
transmitter of a radio base station to talk to radio users or switch to a paging system for an announcement, turn on a
cue-light etc.
3.5 Sidetone trimmers
On the back of the unit are two sidetone trimmers, one above the other. The top trimmer is responsible for setting the
talk-back (sidetone) for Channel I. The trimmer underneath adjusts the sidetone of Channel II.
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