Broadcast Tools Silence Monitor III Plus User manual

Installation and Operation Manual
Due to the dynamic nature of product design, the information contained in this
document is subject to change without notice. Broadcast Tools, Inc., assumes no
responsibility for errors and/or omissions contained in this document. Revisions
of this information or new editions may be issued to incorporate such changes.
Broadcast Tools® is a registered trademark of Broadcast Tools, Inc.
Copyright, 1989 - 2011 by Broadcast Tools, Inc. All rights reserved.
No part of this document may be reproduced or distributed without permission.
Visit www.broadcasttools.com for important product update information.
Firmware Version 1.16 (PCB 103201 Rev E/F)
Manual Update: 12/22/11
Please check the label on U4 for the correct firmware version.
SM-III Plus
Silence Monitor III Plus
INC
®

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SM-III Plus Installation and Operation Manual
Table of Contents
Section Title Page #
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Who to Contact for Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Connecting user equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Configured for backup switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Remote control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Programming Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Mode setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Delay timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Restore delay timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Operation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Front panel switch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Stereo mode operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Dual monaural mode operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Functional/Component Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix
WEBSITE:
Visit our web site for
product updates and
additional information.
2
TABLE OF CONTENTS

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3
SM-III Plus Installation and Operation Manual
INTRODUCTION
INTRODUCTION
Thank you for your purchase of a Broadcast Tools® Silence Monitor III Plus
(referred to as the SM III Plus throughout this manual). We’re confident that this
product will give you many years of dependable service. This manual is intended
to give you all the information needed to install and operate the Broadcast Tools®
SM III Plus.
SAFETY INFORMATION
Only qualified personnel should install Broadcast Tools® products. Incorrect or
inappropriate use and/or installation could result in a hazardous condition.
Broadcast Tools, Inc., is unable to support NON-Broadcast Tools software, hardware or
NON-Broadcast Tools computer/hardware/software problems. If you experience these
problems, please research your hardware/software instruction manuals or contact the man-
ufacturers technical support department.
WHO TO CONTACT FOR HELP
If you have any questions regarding your product or you need assistance, please con-
tact your distributor from whom you purchased this equipment.
If you would like more information about Broadcast Tools® products, you may
reach us at:
Broadcast Tools, Inc.
131 State Street
Sedro-Woolley, WA 98284-1540 USA
Voice: 360 . 854 . 9559
Fax: 866 . 783 . 1742
Internet Home Page: www.broadcasttools.com
E-mail: [email protected]
THANK YOU FOR CHOOSING
BROADCAST TOOLS® BRAND PRODUCTS!
CAUTION!
Broadcast Tools®
Products, as with any
electronic device, can
fail without warning.
Do not use this product
in applications where a
life threatening condition
could result due to failure.
NOTE:
This manual should be
read thoroughly before
installation and operation.
WEBSITE:
Visit our web site for
product updates and
additional information.

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4
SM-III Plus Installation and Operation Manual
DESCRIPTION
PRODUCT DESCRIPTION
The Broadcast Tools® Silence Monitor III Plus improves on the features of the orig-
inal Broadcast Tools® SSM. The Silence Monitor III Plus is designed to monitor
any stereo or two independent monaural sources, generate alarms and transparently
switch to back-up source equipment when silence is detected. Features include:
front panel, remote control and relay monitoring; Plug-in euroblock screw terminals;
“Plug & Play” (NO POTS) installation; dipswitch selection of silence detection of
–23, –25, –35 and –45db; precise time delay from 2 seconds to 85 minutes; precise
restore timing delay from off to 42 minutes; defeatable sonalert aural alarm; relays
for most remote functions. The SM III Plus may be set on a desktop, mounted on a
wall or optional RA-1 rack shelf for mounting up to three units in 1-RU.
PRODUCT FEATURES
• Transparent stereo or dual monaural program switcher with front panel switcher
transfer switch and indicator LED.
• Dipswitch selection of silence detection of –23, –25, –35 and –45db
• Precise time delay from 2 seconds to 85 minutes
• Precise restore timing delay from off to 42 minutes
• Active balanced inputs
• May be configured for stereo or dual independent monaural operation
• Front panel switcher transfer switch
• Front panel “Mute” switch with built-in sonalert and remote defeat input
• Front panel “Manual/Automatic” switch with front panel LED, remote input and
relay
• Front Panel Alarm “Reset” switch, Tripped LED and relay
• External (“Ext”) alarm input with front panel indicator and relay
• Front Panel Power LED
• Two independent audio alarm relays
• Two pulse open collector alarm outputs
• Auxiliary SPDT relay with user configuration of pulse and
• Plug-in euroblock screw terminals
• The SM III Plus may be set on a desktop, mounted on a wall or optional RA-1 rack
shelf for mounting up to three units in 1-RU

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5
SM-III Plus Installation and Operation Manual
INSTALLATION
INSTALLATION GUIDELINES
Inspection:
Please examine your SM III Plus for any damage that may have been sustained dur-
ing shipping. If any is noted, please notify the shipper immediately and retain the
packaging for inspection by the shipper. The package should contain the SM III
Plus, 16.5 vac@600 ma wall power transformer and this manual.
Mounting:
Mount the SM III Plus where it will be visible and rear panel accessible. Four (4)
screw holes are provided for mounting. The SM III Plus may be set on a desktop,
mounted on a wall or optional RA-1 rack shelf for mounting up to three units in 1-RU.
Connecting user equipment:
TB 1, 18-position connector on the rear of the SM III Plus.
Connect the audio source (air monitor, etc) to the left and right inputs, ground the
negative (-) side if the source is unbalanced and observe proper phasing. These are
labeled LT- and LT+ for the left channel and RT- and RT+ for the right channel.
SM III Plus operation configured For Backup Switching:
• Connect the source (MAIN) equipment (Console, Automation, etc) to LT- and
LT+ for the left channel and RT- and RT+ for the right channel. This is the nor-
mally closed contact of the relay switcher and the input to the SM III.
• Connect the source (BACK UP) equipment (CD, etc) to 1LT- and 1LT+ for the
left channel and 1RT- and 1RT+ for the right channel. This is the normally open
contact of the relay switcher.
• Connect the destination equipment (PROCESSING) to 2LT- and 2LT+ for the
left and 2RT- and 2PT+ for the right channel. This is the common contact of the
relay switcher.
• Shields may be connected to the terminal labeled “EG” chassis ground.
When the main input audio is lost, the SM III Plus will sense the loss and start tim-
ing. When the time-out is reached, the SM III Plus will switch to the back-up
source. When audio returns, (after a restore delay, if enabled) the SM III Plus will
automatically switch back to the main source input. The user may also use the front
panel “XFER” switch to alternately switch between the main and back up inputs.
The XFER LED will be illuminated when the SM-III is in an alarm condition or the
back-up input is selected.
NOTE:
If the audio source is a
tuner or receiver, be
sure to feed the SM-III
Plus from the fixed out-
put such as the tape
monitor outputs.
The SM-III Plus is
designed to route the
main audio input to the
output in an event of a
power or unit failure.

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6
SM-III Plus Installation and Operation Manual
INSTALLATION
Remote Control
• Mute input
• Manual/Automatic (Arm) input
• Switcher Transfer Input
• Reset input
• Ext input
• Tripped relay, SPDT contacts.
• Manual/AUTOmatic (Arm) relay, May be configured for either NO or NC
contacts.
• Ext relay, SPDT contacts.
• Left audio (1) alarm relay, SPDT contacts.
• Right audio (2) alarm relay, SPDT contacts.
• Pulse 1, open collector rated at 15Vdc @ 100ma
• Pulse 2, open collector rated at 15Vdc @ 100ma
• Auxiliary relay, SPDT contacts. JP5 is used to select the Aux relays control function.
Move the jumper between XFER (transfer), PUL1 (Pulse 1) or PUL2 (pulse 2).
When configured, the Aux relay will follow the selected function.
Note: ALL inputs are 5 volt TTL/CMOS compatible and active low (pull to
ground to activate).
It is recommended that all cables connected to the SM III Plus be looped through
ferrite cores to suppress RF. Surge protection with RF filtering is also suggested for
the power transformer. The purchase of an inexpensive uninterruptible power sup-
ply (UPS) will provide back up in case of power outages.
CAUTION!
Installation of the SM
III Plus in high RF
environments should be
performed with care.
Shielded cable is sug-
gested for all control,
audio inputs and out-
puts. All shields should
be tied to the “CHAS-
SIS GROUND” termi-
nal. The station
ground should be con-
nected to the chassis
ground screw (CH1)
located behind J1 as
viewed from the rear.
For lightning protec-
tion devices, check out
www.polyphaser.com
and www.itwlinx.com.
WEBSITE:
Visit our web site for
product updates and
additional information.

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7
SM-III Plus Installation and Operation Manual
PROGRAMMING
PROGRAMMING GUIDELINES
Mode Setup:
Jp-2 selects the two operating modes: Installed = Stereo
Removed = Dual Monaural
Sensitivity Setup:
A 4-position dipswitch is provided to change the sensitivity of the SM III Plus.
Locate SW 7 and follow the grid below.
Sensitivity SW 7-1 / Left (1) SW 7-2 / Left (1) SW 7-3 / Right (2) SW 7-4 / Right (2)
- 23 db ON ON ON ON
- 25 db OFF ON OFF ON
- 35 db ON OFF ON OFF
- 45 db OFF OFF OFF OFF
Delay timing setup:
The SM III Plus time delay is set via SW 1, the 8-position dipswitch and Jp-1. The
default for this jumper is installed. This provides TWO second resolutions. To pro-
vide longer time resolution, remove and stow Jp-1, which will provide 20 second
resolution. The switches are set at the factory for a 6 second delay (switches 1 & 2
ON and Jp-1 installed). Each switch has a digit value as shown in the two tables
below. For the factory default setting, as shown in the two-second-resolution table
below, we have turned ON switches one and two. Switch one represents a one-digit
value, while switch two represents a two-digit value. We add these two digit values
together to obtain a total digit value of three. Each value is given a time delay of
two or twenty seconds, so we therefore multiply the total digit value of three by two
(or 20) to obtain six (or 60) seconds.
NOTE: The following table refers to the time delay in seconds.
Time Delay Two (2) Second Resolution Table

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8
SM-III Plus Installation and Operation Manual
PROGRAMMING
Time Delay Twenty (20) Second Resolution Table
Restore timing setup:
The SM III Plus restore time delay is set via SW 2, the first six positions of the dip-
switch and Jp-1. The default for this jumper is installed. This provides TWO second
resolutions. To provide longer time resolution, remove and stow Jp-1, which will
provide 20 second resolution. The switches are set at the factory for off. Each switch
has a digit value as shown in the two tables below. For the factory default setting.
Please note the table below refers to the restore time delay in seconds.
Restore Delay Two (2) Second Resolution Table
WEBSITE:
Visit our web site for
product updates and
additional information.

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9
SM-III Plus Installation and Operation Manual
PROGRAMMING
November 19, 2007
Changes to the Broadcast Tools® SM-III with version 1.16 firmware. Please check the label
on U4 for the correct firmware version.
Restore timing setup:
The SM III Plus restore time delay is set via SW 2, the first six positions of the dipswitch
and Jp-1 The default for this jumper is installed. This provides TWO second resolutions.
To provide longer time resolution, remove and stow Jp-1, which will provide 20 second res-
olution. The switches are set at the factory for off. Each switch has a digit value as shown
in the two tables below. For the factory default setting. Please note the table below refers
to the restore time delay in seconds.
NOTE 1, SW2-7 now has two independent functions.
When OFF, the SM-III switches back to input one from input two when the alarm is cleared
or the audio returns.
When ON it allows the SM-III to stay at input two after the alarm is cleared or the audio
returns.
NOTE 2, SW2-8 now has two independent functions.
When OFF, the SM-III is armed at start-up.
When ON, the SM-III is NOT armed at start-up.
AUX relay configuration
JP5 is used to select the Aux relays control function. Move the jumper between XFER
(transfer), PUL1 (Pulse 1) or PUL2 (Pulse 2). When configured, the Aux relay will follow
the selected function.

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10
SM-III Plus Installation and Operation Manual
OPERATION
OPERATION GUIDELINES
Front panel switches:
“XFER” switch
Forces the SM III Plus between the main and back-up audio switcher input.
“MUTE” switch
Used to silence the sonalert. To permanently disable the sonalert, JP4 must be
removed and stowed.
Manual/”AUTO”matic Switch
Manual or Automatic (Arm) operation. When in the “AUTO” mode, the front panel
“AUTO” led will be illuminated and the Manual/Auto relay will be closed.
“RESET” switch
This switch clears all alarms, sonalert and resets the program switcher. If the alarm
still exists, the SM III Plus will alarm again after the time out delay period. If the
SM III Plus has automatically reset, pressing the reset switch will clear the tripped
and audio alarm led(s) and relays.
Stereo Mode operation
When the SM III Plus is in auto mode (armed), it will trigger in the absence of audio
(see sensitivity setup) on either or both channels after the delay time has expired
(See delay dipswitch SW1) will cause the following action:
1 - The front panel left and right audio LED’s will extinguish.
2 - Unit switches from the main source to the backup source.
3 - Turn on the failed audio alarm LED’(s) (Left and/or Right) and relays.
4 - Turn on the “Tripped” led and relay.
5 - Pulse the pulse 1 open collector for 1 second.
6 - Sound the sonalert.
When both channels return and the restore time delay has expired (if enable), the fol-
lowing action occurs:
1 - Switch from the backup source to the main.
2 - Open the left and right audio alarm relays.
3 - The front panel left and right audio LED’s will illuminate
4 - Pulse the pulse 2 open collector for 1 second.
5 - The left and/or right audio alarm indicators will stay illuminated to provide his-
tory of the alarm.
6 - The “tripped” relay stays energized until the SM III Plus is reset.
NOTE:
The sonalert may be
defeated by pressing
the front panel “mute”
switch, remote input
or remove the jumper
on JP4 .
The “EXT” (external)
input will trigger imme-
diately and switch to the
backup source. This
may be used to monitor
STL or satellite squelch
relay, etc.