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Call-In Switches
Two call-in switches, CA10A and CA11A, are recommended for use with the SI and PI.The CA10A is a momentary push
switch that has circuitry to light the annunciator light on the SBA225 room selector panel.The CA11A has the same capa-
bility as the CA10A and includes a privacy lock-out position that inhibits the MCP35A control panel from listening
through the room speaker (it does not interfere with the ability to call the station from the MCP35A).The wiring of the
call switches is shown below.
Voice Call-In Feature
Voice call-in is not recommended for new installations. Pre-existing intercom systems may already have call-in switches
that are wired in parallel with all the other call-in switches. In this instance, the MCP35A voice call-in feature can be used.
With this style of operation a room must press the call-in switch and speak into the room speaker.The built-in speaker in
the MCP35A will monitor this call so that people near the control panel will hear it.Typically the caller will say what room
the call is being made from.The room selector switch for that room can then be set for a two way intercom conversation.
Voice Call-In Wiring
Contact the Bogen Application Engineering Department for information regarding this type of application.
CA10A Wiring Schematic
CA11AWiring Schematic (with Privacy
)