Clear-Com SB-704 - Manual (Page 12)

S B - 7 0 4 M A I N S T A T I O N 1 - 6
The main program input is the one on the XLR connector on the rear panel.
To listen to the main program in the speaker or headphone, adjust the program
level control just below the link and all talk pushbuttons.
Sending and Receiving Call Signals
To send a call signal on an intercom channel press the call button for that
channel. This is a momentary function.
If the auto-call option is selected for that channel, activating a talk button will
also send a call to that channel.
Receiving a call signal is indicated by a flashing red call button.
Linking Intercom Channels Together
A pushbutton allows the connecting of intercom channels B, C, and D to
channel A. The link pushbutton is latching in action. The link button
illuminates amber when all channels are linked together. In the latched
position, the entire station operates as one party line.
Talk and listen buttons are non-functional on channels B, C, and D when they
are linked to channel A.
The Announce Function
A single pushbutton sends the active microphone’s audio to the announce
output on the rear panel. Any active talks are disabled while the announce
button is held. The announce button illuminates amber when held. Talk and
listen latches are not reset, but the microphone’s audio does not go to the
intercom line while the announce function is active. A set of relay contacts
are activated to control some external device.
There is an option which allows program audio to be fed to the announce
output. If this option is enabled, the announce pushbutton interrupts this audio
when it is pressed. Program audio feed to the announce output is selected by
setting jumper J11 on the main board to the on position.
Channel Assignments Using the Slide Switch Matrix
The ten assignment switches let you assign the switchboard destinations
(#1 - #10 on the rear panel) to any of the four main intercom channels (A, B,
C, or D), an isolated off channel, or a separate common party line just for
these inputs.
When the switchboard destinations are assigned to the off position, they are
isolated from all other switchboard destinations and isolated from the four
main intercom channels. Stations on one of these lines can only talk to each
other. A call signal on one of these lines will be indicated by the amber LED
above the particular matrix switch. Pressing the all talk button on the station
will send the microphone to the channel in the off position.
When the switchboard destinations are assigned to the party-line position, all
destinations that are placed in the party-line position will be connected into a
common party line isolated from the rest of the station. Pressing the all talk