Clear-Com MS-704 User Manual
CLEAR-COM ENCORE
MS-704 FOUR-CHANNEL MAIN STATION
RM-704 FOUR-CHANNEL REMOTE STATION
INSTRUCTION MANUAL
MS-704/RM-704 Four-Channel Main/Remote Stations Instruction Manual
© 2007 Vitec Group Communications
All Rights Reserved
Part Number 810345Z Rev. 2
Vitec Group Communications, LLC
850 Marina Village Parkway
Alameda, CA 94501
U.S.A
Vitec Group Communications
7400 Beach Drive
Cambridge Research Park
Cambridgeshire
United Kingdom
CB25 9TP
Vitec Group Communications
Room 1806, Hua Bin Building
No. 8 Yong An Dong Li
Jian Guo Men Wai Ave
Chao Yang District
Beijing, P.R. China 100022
Clear-Com is a registered trademark of Vitec Group Communications.
The Clear-Com Logo is a registered trademark of Vitec Group Communications.
CONTENTS
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
The Clear-Com Concept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Understanding the MS-704/RM-704 Main and Remote Stations . . . . . . . . . 1-2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Intercom Power Status Lights (MS-704) . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Selecting Microphones and Enabling the Speaker . . . . . . . . . . . . . . . . . 1-5
Listening to Intercom Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Talking on Intercom Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
The All-Talk Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Monitoring Main Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Sending and Receiving Call Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Linking Intercom Channels Together (MS-704) . . . . . . . . . . . . . . . . . . 1-6
The Announce Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Remote Mic Kill Function (MS-704) . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Hidden Front Panel Options and Adjustments . . . . . . . . . . . . . . . . . . . . . 1-7
DIP Switch Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Hidden Adjustment Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Rear Panel Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Intercom Line Termination (MS-704) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Short-Circuit and and Overload Conditions . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Summary of Front-Panel Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Installation Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Intercom Line Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Line Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Fail-Safe Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Connecting Intercom Channels on RM-704 . . . . . . . . . . . . . . . . . . . . . 2-4
Power Distribution and Short Circuit Protection. . . . . . . . . . . . . . . . . . . . 2-5
Intercom Cable Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Portable Installation Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Permanent Installation Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Ground Isolation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Physical Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Description of Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Headset Connector (Front Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Panel Mic Connector (Front Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Intercom Line Connectors (Rear Panel). . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Program Input (Rear Panel). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Announce Output (Rear Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
IFB/Hot Mic (Rear panel, 1/4 inch Phone Jack) . . . . . . . . . . . . . . . . . . . 2-10
Accessory (Rear Panel, DB-15F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
MS-704/RM-704 FOUR-CHANNEL MAIN/REMOTE STATIONS
i
Internal Option Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
IFB Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Run/Test Mode Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Program Audio Feed to Announce Output Jumper . . . . . . . . . . . . . . . 2-12
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
MS-704 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
RM-704 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
MS-704/RM-704 Four-Channel Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
LIMITED WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-I
Warranty Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i
Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Non-Warranty Repairs and Returns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Extended Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Service Contract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii
Liability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii
ii
MS-704/RM-704 FOUR-CHANNEL MAIN/REMOTE STATIONS
Please read and follow these
instructions before operating
this product.
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves,
or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A
polarized plug has two blades, with one wider than the other. A
grounding-type plug has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. If the provided plug
does not fit into your outlet, consult an electrician for replacement of the
obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at
plugs, convenience receptacles, and the point where they exit from the
apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long
periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required when
the apparatus has been damaged in any way, such as power-supply cord or
plug is damaged, liquid has been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped.
15. WA RN I NG : To reduce the risk of fire or electric shock, do not expose this
product to rain or moisture.
Please familiarize yourself with the safety symbols in Figure 1. When you see
these symbols on this product, they warn you of the potential danger of electric
shock if the main station is used improperly. They also refer you to important
operating and maintenance instructions in the manual.
MS-704/RM-704 Four-Channel Main/Remote Stations
iii
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol alerts you to the presence of uninsulated dangerous
voltage within the product's enclosure that might be of sufficient
magnitude to constitute a risk of electric shock. Do not open
the product's case.
This symbol informs you that important operating and maintenance instructions are included in the literature accompanying
this product.
Figure 1: Safety Symbols
EMC AND SAFETY
The MS-704 and RM-704 stations meet all relevant CE, FCC, UL (MS-704
only), and CSA specifications set out below:
EN55103-1 Electromagnetic compatibility. Product family standard for audio,
video, audio-visual, and entertainment lighting control apparatus for
professional use. Part 1: Emissions.
EN55103-2 Electromagnetic compatibility. Product family standard for audio,
video, audio-visual, and entertainment lighting control apparatus for
professional use. Part 2: Immunity.
UL 60065-7, CAN/CSA-C22.2 No.60065-3, IEC 60065-7 Safety
requirements.
And thereby compliance with the requirement of Electromagnetic
Compatibility Directive 2004/108/EC and Low Voltage Directive 2006/95/EC
This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
iv
MS-704/RM-704 Four-Channel Main/Remote Stations
1
Clear-Com manufactures a
wide variety of both portable
and fixed installation units.
All are compatible with each
other.
OPERATION
INTRODUCTION
Congratulations on choosing this Clear-Com product. Clear-Com was
established in 1968 and remains the market leader in providing intercoms for
entertainment, educational, broadcast and industrial applications. The
ruggedness and high build-quality of Clear-Com products defines the industry
standard. In fact, many of our original beltpacks and main stations are still in
daily use around the world.
We recommend that you read through this manual completely to better
understand the functions of the MS-704 and RM-704. If you encounter a
situation or have a question that this manual does not address, contact your
dealer or call Clear-Com directly. Our applications support and service people
are standing by to assist you. (Refer to Chapter 5,“Warranty” for contact
information.) Thank you for selecting Clear-Com for your communications
needs.
THE CLEAR-COM CONCEPT
Clear-Com is a closed-circuit intercom system that consistently provides
high-clarity communication in high-noise and low-noise environments. A basic
system consists of a single- or multi-channel power supply or main station
connected to various single- or multi-channel remote stations, such as beltpacks
and loudspeaker stations.
Clear-Com manufactures a wide variety of both portable and fixed-installation
units. All are compatible with each other. Clear-Com intercom systems can also
interface with other communication systems and devices.
Clear-Com is a distributed amplifier system; each main and remote station
houses its own mic preamplifier, headset or speaker power amplifier, and
signaling circuitry. Stations bridge the intercom line at a very high impedance
and place a minimum load on the line. The audio level always remains constant,
and does not fluctuate as stations leave and join the network. Low-impedance
mic input lines and specially-designed circuitry make Clear-Com channels
virtually immune to RFI and dimmer noise.
Clear-Com stations are interconnected with two-conductor, shielded
microphone cable. Portable stations are connected with two conductor cables
with 3-pin XLR connectors. One wire carries the DC power from a main station
or power supply to all remote stations, and the other wire carries 2-way (duplex)
audio information. The shield acts as a common ground. One termination (per
channel) is needed throughout the intercom network, and is usually located in
the main station or power supply.
MS-704/RM-704 FOUR-CHANNEL MAIN/REMOTE STATIONS
1-1
Clear-Com main stations, power supplies and certain remote stations each have
an auxiliary program input with its own volume control, which allows an
external audio source to be fed to the intercom system.
Visual signal circuitry (call lights), a standard feature on all main and remote
stations, allows the user to attract the attention of operators who have removed
their headsets.
Short
CH.A
CH. B
CH. C
CH. D
MS-704
RM-704
MS-704
Panel Mic
Headset
(Off)
(Default)
On
Sidetone
Adjust
Panel Mic
Gain
Panel Mic
Headset
(Off)
(Default)
On
Sidetone
Adjust
Panel Mic
Gain
TO PREVENT
WARNING:
FIRE OR SHOCK HAZARD DO NOT
EXPOSE THIS EQUIPMENT TO RAIN
OR MOISTURE.
TO PREVENT
CAUTION:
ELECTRIC SHOCK DO NOT
REMOVE COVER. NO USER
SERVICEABLE PARTS INSIDE.
REFER TO QUALIFIED SERVICE
PERSONNEL.
Mic On
Announce
AllTalk
Panel
Link On
Headset
Mic Select
Remote
Mic Kill
HS
BCD
Lim
Program
Interrupt
Mic On
Mic Select
HS
BCD
Lim
Program
Interrupt
Program
DA
D
C
C
B
DA
B
C
A
B
Talk Latch
Auto-Talk
Auto-Call
Disable
/Listen
Announce
AllTalk
Panel
Headset
Program
DA
D
C
C
B
DA
B
C
A
B
Level
Talk Latch
Auto-Talk
Auto-Call
Disable
/Listen
Listen
Talk
Call
BCD
A
Pgm
Null
Listen
Null
Listen
Level
Program
On/Off
BC
Program
On/Off
Channel B
ChannelA
Listen
Talk
Call
DA
Pgm
Null
Listen
Null
Listen
Channel B
ChannelA
Channel DChannel CChannel BChannel A
Listen
Listen
Talk
Call
Pgm
Null
Listen
Channel C
Listen
Talk
Call
Pgm
Null
Listen
Channel C
Volume
Talk
On
Off
Call
Speaker
(Short)
Long
BCDA
Pgm
Pgm
Null
Listen
Line
Length
Channel D
Channel DChannel CChannel BChannelA
Listen
Volume
Talk
On
Off
Call
Speaker
(Short)
Long
BCDA
Pgm
Pgm
Null
Listen
Line
Length
Channel D
Figure 1-1: MS-704 and RM-704 Front Panels
On
Off
Channel A
Term
Channel C
Output: 30V, 1.2A Continuous, 2A Peak
On
Off
Hot Mic/IFB
Figure 1-2: MS-704 Rear Panel
Channel B
Channel D
4-Channel
Main Station
MS-704
4-Channel
Remote Station
RM--704
On
Off
Program In
Term
On
Off
Auxiliary
Announce Out
1-2
Figure 1-3: RM-704 Rear Panel
UNDERSTANDING THE MS-704/RM-704 MAIN AND REMOTE STATIONS
The MS-704 and RM-704 intercom stations are four-channel
microprocessor-controlled stations intended to work with other Clear-Com
party-line products. Both stations have a speaker, provisions for installing a panel
microphone, and a headset connector.
MS-704/RM-704 FOUR-CHANNEL MAIN/REMOTE STATIONS
The MS-704 is a four-channel main station that contains a no-fail system power
supply. The RM-704 is a four-channel remote station intended to be powered
from the intercom line.
The following is a list of features found in the MS-704 and RM-704 intercom
stations:
• MICROPROCESSOR CONTROL: Most aspects of station operation are
under microprocessor control.
• REMOVABLE ACCESS PANEL: A removable access panel allows access to
most controls and option DIP switches.
• INDIVIDUAL CHANNEL CONTROLS: Each channel has individual
talk, listen, and call pushbuttons for each channel.
• MOMENTARY/LATCHING TALK BUTTONS: The talk buttons have a
momentary and latching action depending on how the button is used. The
latching function can be defeated with DIP switches.
• INDIVIDUAL CHANNEL ADJUSTMENTS: Each channel has
individual listen level controls, channel null adjustments, and program feed
level controls.
• MULTIPLE PROGRAM INPUTS: Multiple program inputs are provided
for local station monitoring and program feed to intercom lines for local
talent cuing (IFB).
• INTERNAL IFB (IFB - Interrupt Foldback of program feeds): Program
can be fed to each channel and interrupted (IFB) when a talk function is
active or when a call signal is received on that channel. An internal jumper
determines whether the IFB function is talk- or call-signal activated.
• LINK FUNCTION (MS-704): The MS-704 has a link function that places
all channels into a common party-line at the push of a single button.
• ALL-TALK: An all-talk button allows instant access to all channels.
• ANNOUNCE FUNCTION: An announce button allows external paging.
A set of relay contacts is provided to control an external system.
• PROGRAM FEED OVER STAGE ANNOUNCE: An internal jumper
allows the main program feed to be fed to the stage announce output. The
program is automatically interrupted when the announce button is pressed.
• MIC ON/OFF SWITCH: A separate mic on/off push-button allows
turning the microphone off without upsetting the setting of talk switches.
• REMOTE MIC KILL SWITCH (MS-704): Front-panel switch allows you
to turn off all latched talks on remote stations and beltpacks.
• EXTERNAL MIC ON/OFF INPUT: An external logic input allows the
mic on/off function to be switched remotely.
• EXTERNAL IFB and HOT MIC OUTPUT: A rear panel jack provides
direct connection to Clear-Com’s external IFB system such that the station’s
microphone can be used in the external IFB system. A buffered unswitched
output of the selected microphone is also available.
MS-704/RM-704 FOUR-CHANNEL MAIN/REMOTE STATIONS
1-3
• SPEAKER ON/OFF SWITCH: The speaker may be turned on and off with
a front panel switch.
• SPEAKER DIMMING: Whenever a talk is active, the speaker output is
dimmed approximately 6 dB to prevent feedback.
• PANEL MIC GAIN: The preamplifier for the panel microphone has a gain
trim adjustment to allow field trimming. Adjustment of the panel
microphone gain also varies the frequency response of the preamplifier to
compensate for feedback when the microphone is used up close.
• POWER SUPPLY WITH SHORT CIRCUIT PROTECTION: The
MS-704 features redundant powering to remote stations by providing
separate short-circuit-protected power sources to each of the four intercom
lines. A short on one intercom line will not bring the whole system down.
Short circuit indicators are provided on the front panel for each channel.
• HEADSET AUDIO LIMITER: The headset audio limiter restricts the
maximum audio level heard in the headset to protect the hearing of the user.
You can turn this feature on or off with one of the front-panel dip switches.
OPERATION
Once installed and operational, the MS-704 and RM-704 intercom stations are
easy to operate. The following sections describe normal operation of the units,
use of controls available under the access panel, and abnormal operation of the
power distribution system.
Some of the following functions are exclusive to the MS-704 and are marked as
such.
NORMAL OPERATION
Normal operation of the MS-704 and RM-704 requires access only to the front
panel controls. The following is a brief description of how to use the front panel
controls in day-to-day operation.
There are option DIP switches and adjustment controls behind the access panel
in the lower portion of the front panel. To gain access to the switches and
controls, pull on the two latches on either end of the access panel and remove it.
This section discusses the following subjects:
• Intercom power status lights
• Selecting microphones and enabling the speaker
1-4
• Listening to intercom channels
• Monitoring main program
• Talking on intercom channels
• The all-talk function
• Sending and receiving call signals
• Linking intercom channels together (MS-704)
MS-704/RM-704 FOUR-CHANNEL MAIN/REMOTE STATIONS
• The announce function
Intercom Power Status Lights (MS-704)
The four red short lights are failure indicators for each of the four intercom lines.
These lights will assist in locating a shorted or overloaded channel. Within as
little as ½ second of automatically cutting off power to an overloaded intercom
line, the MS-704 will attempt to turn power on again. This allows momentary
short or overload conditions to clear automatically. Shorts are normally caused by
miswiring or damaged cables. Overloads are generally caused by connecting too
many beltpacks and stations to an intercom line.
Clear-Com’s advanced fail-safe design can sense the difference between a short or
an overload to optimally protect itself. Power is restored in as little as ½ second,
depending upon whether there was a single or multiple short or overload. The
other channels continue to operate normally. The MS-704’s advanced fail-safe
circuit will bring the power back up even under full load conditions. Front-panel
lights indicate a fault on any of the four channels.
When the station is first turned on, all four short lights are normally off.
Selecting Microphones and Enabling the Speaker
To select the desired microphone, move the microphone select switch to the
appropriate position: either “panel” or “headset.”
The mic on pushbutton allows turning the microphone on or off. The mic on
pushbutton lights blue when the microphone is active.
The microphone will be turned on automatically whenever a talk function is
activated as it is assumed that you wish to talk. If one or more talks are active, you
may turn the microphone off without unlatching the active talks.
The speaker may be turned on and off with the speaker switch.
Listening to Intercom Channels
To listen to an intercom channel, press the listen button for the desired channel.
The listen button lights green to indicate that the listen function is on.
The listen level control (below the call button) for that channel is usually set to
full on position and the listening volume is set by the intercom volume control to
the left of the speaker.
If several channels are being listened to at the same time, it might be desirable to
adjust the individual listen levels of each channel for the desired mix.
Talking on Intercom Channels
To talk on an intercom channel, press the desired talk button. Pressing and
holding the button will cause the function to be active only while the button is
held (momentary). Pressing and releasing the button quickly will cause the
function to latch on if it was off or turn off if it was on (latching).
The latching function can be defeated on an individual channel with an option
DIP switch beneath the access panel (latch disable DIP switch).
MS-704/RM-704 FOUR-CHANNEL MAIN/REMOTE STATIONS
1-5
The button will be illuminated blue when the talk function is off and amber
when the talk function is on.
Another option allows the automatic setting of a listen function whenever a talk
is active (auto-listen DIP switch) for each channel.
The All-Talk Function
Pressing the button marked all talk sends the selected microphone to all channels
while the button is pressed (momentary only). This button lights amber when
pressed.
Monitoring Main Program
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 s en d 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 (MS-704)
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.
Ta l k 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. Ta l k 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.
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Remote Mic Kill Function (MS-704)
When you press the remote mic kill pushbutton, the talk function shuts off for
every beltpack on all four channels. If the talk functions of a large number of
MS-704/RM-704 FOUR-CHANNEL MAIN/REMOTE STATIONS
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