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10
GE N ER AL I N T E RFACE S
10 RB-LC3 3 Way Light/Power Controller
Introduction
Fig 10-1: RB-LC3 Front Panel.
The RB-LC3 is a triple output switching unit for controlling external mains indicators,
primarily studio status lights for broadcasting applications, such as On-Air, Mic-Live and
Rehearsal/Live lights. Each output can be individually controlled by one of three remote
inputs (pulled high, or low), by a telephony input (when ringing, or off-hook or both), or
a combination of two inputs (to control two outputs, e.g. for Rehearsal/Live situations).
The type of control is set using a 12 way DIP switch (4 switches for each output allowing
16 different settings, 14 for control type selection and 2 for operating mode selection).
All connections are on the rear panel. The three IEC outputs are controlled by zero-cross
point drivers. When an output is activated, the A.C. voltage level at that output will be equal
to the mains input voltage used to power the unit.
External control of the switched mains outputs is via the 15 way D-type plug connector.
The telephone Line input and Handset output are via two RJ11-4 type connectors. The
telephone connections are wired pin to pin from Line to Handset except when the remote
Ring Mute control input is asserted. In this case the ring signal to the Handset is muted. The
status of the telephone Line is continually monitored so that Handset ringing and off-hook
conditions can be indicated.
A pre-set potentiometer on the rear panel controls the flash rate of the output when the
appropriate mode is selected. Neon indicators on each power socket show the status of the
mains output.
An LED power indicator on the front panel displays the incoming power supply connection.
57
Redbox User Handbook No 3
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