Clear-Com MS-232, User Manual

Page: 1 / 21

INTRODUCTION
Congratulations on choosing this Clear-Com product. Clear-Com was established in 1968 and remains
the market leader in providing intercom for entertainment, educational, broadcast and industrial appli-
cations. The ruggedness and high build-quality of Clear-Com products is the industry standard. In fact,
many of our original beltpacks and main stations are still in daily use around the world.
The MS-232 Two-Channel Main Station is a powerful, yet user friendly unit that can serve as the heart
of a Clear-Com system. We recommend that you read through this manual completely to better under-
stand the functions of the MS-232. If you encounter a situation or have a question that this manual
does not address, contact your dealer or call Clear-Com directly at the factory. Our applications sup-
port and service people are standing by to assist you. Thank you for selecting Clear-Com for your
communications needs.
Description
The Clear-Com PL-Pro
TM
MS-232 is a two-channel, one rack space main station ideal for ENG and EFP
trucks, production studio consoles, theatre, live performances, and small TV facilities. It features ex-
cellent speech intelligibility in all noise levels and can be tailored to your needs through its programma-
ble options.
Selectable two-channel talking and/or listening allows the operator to communicate on either of the in-
tercom channels separately or on both at once. The illuminated dual-action talk buttons are electronic
momentary or latching. Monitoring can be done through the headset, the integral speaker, or both at
once. The MS-232 offers both visual and audible call signaling to attract the attention of operators who
have removed their headsets or turned off their speakers. The Remote Mic Kill (RMK) feature provides
the ability to turn off all open mics on Series 500 beltpacks.
The MS-232 can control a paging speaker for studio announcements. A front panel button activates
this function and an associated relay. A balanced program input allows monitoring external audio using
the headset or speaker.
This main station accepts dynamic headsets, such as the Clear-Com PL-Pro
TM
Series. Individual side-
tone controls for each intercom channel allow the operator to vary the level of his/her own voice as
heard in the headset and speaker. It also accepts Clear-Com gooseneck panel microphones.
The integral speaker can be turned on or off by a convenient front panel switch. An automatic speaker
dipping circuit will lower the level of the speaker when the announce button, talk buttons or program in-
terrupt are activated. This feature helps minimize feedback.
The MS-232 also incorporates a dual-channel program interrupt system (IFB). When activated, one or
more stations can interrupt the program audio to another intercom station or a talent wearing Clear-
Com's wired or wireless talent receivers. Clear-Com's stand-alone IFB system can also be connected
to this station.
The MS-232 provides 30-Volt DC power to operate Clear-Com beltpacks and remote stations. This
power is distributed between the two channels, and will support up to 60 headset stations or 20 speaker
stations. Clear-Com's new fail-safe design automatically shuts down the power to a channel when a
short circuit or electronic overload is sensed on that channel. The other channel will continue to oper-
ate normally. Once the fault condition is removed, the MS-232's fail-safe circuit will restore power,
even under full load conditions. LED indicators signal a short or overload on either channel.
The MS-232 will operate from any AC line voltage between 90 and 240 Volts AC at 50 or 60 Hz. The
MS-232 installs in a standard 19" equipment rack, using only one rack space. The unitized aluminum
chassis and extra-thick front panel with integral rack ears result in reduced size and a lighter weight
package that maintains legendary Clear-Com ruggedness. Three 3-pin XLR connectors are provided
for connection to each intercom channel.
The MS-232 is compatible with all Clear-Com Party-Line intercoms.
Clear-Com MS-232 Two-Channel Main Station
1