GRASS VALLEY PERFORMER User manual

PERFORMER
DIGITAL 10X1 ROUTING SWITCHER
Instruction Manual
TP3461-01
FIRST PRINTING: SEPTEMBER 1994

Contacting Grass Valley Group
Copyright © Grass Valley Group. All rights reserved.
This document may not be copied, in whole or in part, or otherwise reproduced, except as specifically
permitted under U.S. copyright law, without the prior written consent of Grass Valley Group, P.O. Box
599000, Nevada City, CA 95959-7900 USA. GRASS VALLEY GROUP is a registered trademark and
Grass Valley is a trademark of Grass Valley Group. All registered trademarks and trademarks are prop-
erty of their respective holders. Grass Valley Group products are covered by U.S. and foreign patents,
issued and pending. Product options and specifications subject to change without notice. The informa-
tion in this manual is furnished for informational use only, is subject to change without notice, and
should not be construed as a commitment by Grass Valley Group. Grass Valley Group assumes no re-
sponsibility or liability for any errors or inaccuracies that may appear in this publication.
Region Voice Fax Address Web Site
North America [phone]
530-478-4148 [phone] Grass Valley Group P.O. Box 599000
Nevada City, CA 95959-7900
USA
www.grassvalleygroup.com
Pacific Operations [phone]
Support: 852-2585-6579 [phone]
U.K., Europe, Asia, Middle East [phone] [phone]
France [phone]
Germany [phone] [phone]

iii
Important Safeguards and Regulatory Notices
Symbols and Their Meaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xii
North American Power Supply Cords . . . . . . . . . . . . . . . . . xiii
International Power Supply Cords . . . . . . . . . . . . . . . . . . . . xiii
EMC Regulatory Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Federal Communications Commission
(FCC) Part 15 Information . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Germany – FTZ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Preface
About the Performer™ Manual. . . . . . . . . . . . . . . . . . . . . . . . . . xiiv
Glossary of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii
Section 1 — Product Description
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Contents

iv
Contents
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Rear Motherboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
VAA Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Front Panel Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Power Supply Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Tally Board (option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Section 2 — Installation
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Uncrating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Button Labeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Switcher Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Common Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Performer Setup Switch Location . . . . . . . . . . . . . . . . . . . . 2-10
Performer Remote to Performer . . . . . . . . . . . . . . . . . . . . . 2-11
PC (Performer ASCII) to Performer . . . . . . . . . . . . . . . . . . 2-12
PC (Performer ASCII) to Performer (cont.) . . . . . . . . . . . . 2-13
PC (Performer ASCII) to Modem to Performer . . . . . . . . . 2-14
PC (Performer ASCII) to Modem to Performer (cont.) . . 2-15
PC (TEN-XL ASCII) to Performer (cont.) . . . . . . . . . . . . . 2-17
PC (TEN-XL ASCII) to Modem to Performer . . . . . . . . . . 2-18
PC (TEN-XL ASCII) to Modem to Performer (cont.) . . . . 2-19
TEN-XL SCP (XY-mode) to Performer . . . . . . . . . . . . . . . . 2-20
TEN-XL SCP (XY-mode) to Modem to Performer . . . . . . 2-21
TEN-XL Remote Panels to Performer . . . . . . . . . . . . . . . . . 2-22
TNX-AFV19 to Performer . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
20-TEN XYCP to Performer . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
Model 100/110 to Performer (Always Follow mode) . . . 2-25
Model 100/110 to Performer (Conditional mode) . . . . . . 2-26
Model 200 to Performer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
Model 300 to Performer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28
Installation Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
Frame Top Removal and Replacement . . . . . . . . . . . . . . . . 2-30

v
Contents
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30
Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31
Removing/Replacing Terminating Resistors . . . . . . . . . . 2-32
Remote Connector Cabling . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
OPTION Connector Cabling . . . . . . . . . . . . . . . . . . . . . . . . 2-35
Tally Board Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35
Tally Board Option Installation . . . . . . . . . . . . . . . . . . . . . . 2-36
Looping Cable Option Installation . . . . . . . . . . . . . . . . . . . 2-39
Vertical Interval Strobe Selection . . . . . . . . . . . . . . . . . . . . 2-40
Switch Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41
Switcher Polling Address . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43
Polling Address,
Non GVG TEN-XL ASCII Protocols. . . . . . . . . . . . . . . 2-44
Polling Address, GVG TEN-XL ASCII Protocol . . . . 2-44
Serial Communications Protocol Selection. . . . . . . . . . . . . 2-45
General Selection Instructions . . . . . . . . . . . . . . . . . . . 2-45
Control Panel Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47
Performer Serial Remote Control Panel . . . . . . . . . . . . . . . 2-48
Performer Protocol Selection . . . . . . . . . . . . . . . . . . . . 2-48
General Rules for Performer/TEN-20,
20-TEN Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50
Performer S1 Switch Settings . . . . . . . . . . . . . . . . . . . . 2-50
Remote Panel Switch Settings . . . . . . . . . . . . . . . . . . . 2-54
TEN–XL SCP Switch Configuration . . . . . . . . . . . . . . . . . . 2-59
Controlling More Than One Performer . . . . . . . . . . . 2-59
SCP Power Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68
TEN–20/20–TEN Panels and Serial Interface . . . . . . . . . . 2-69
Panel Protocol Selection . . . . . . . . . . . . . . . . . . . . . . . . 2-69
General Rules for TEN-20, 20-TEN Protocol . . . . . . . 2-71
Performer S1 Switch Settings. . . . . . . . . . . . . . . . . . . . . 2-71
TEN–20 Panel Switch Settings . . . . . . . . . . . . . . . . . . . 2-75
Serial Interface Switch Settings . . . . . . . . . . . . . . . . . . 2-79
20–TEN Panel Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . 2-83
DC Power Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-85
Section 3 — Operation & Service
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Performer Front & Remote Panel Operation . . . . . . . . . . . . . . . 3-2

vi
Contents
Audio Follow Video . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Breakaway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Video Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Audio 1 Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Audio 2 Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Protect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Joystick Override Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
TEN-XL Control Panels Operation . . . . . . . . . . . . . . . . . . . . . . . 3-10
TNX–RCP, TNX–TCP Remote Control . . . . . . . . . . . . . . . . 3-10
Audio Follow Video Source Selection . . . . . . . . . . . . . 3-10
Breakaway Source Selection . . . . . . . . . . . . . . . . . . . . . 3-11
TEN–XL Audio Follow Video Control Panels . . . . . . . . . . 3-12
Audio Follow Video Source Selection . . . . . . . . . . . . . 3-12
19 x 1 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
TNX–SCP Serial Remote Control Panel . . . . . . . . . . . . . . . 3-14
Dual Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
X–Y Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Error Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Power Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
TEN–20, 20–TEN Control Panels Operation . . . . . . . . . . . . . . . 3-19
10 BPS Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Placing Protects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Error Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
MBCP Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Selecting Destinations . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Presetting and Taking a Source . . . . . . . . . . . . . . . . . . 3-23
Clearing Entry Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
Placing Protects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
Displaying Destinations . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
XYCP Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Presetting Destinations . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Presetting Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26
Performing a Take . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27
Using the Last Function . . . . . . . . . . . . . . . . . . . . . . . . . 3-27
Using the Protect Function . . . . . . . . . . . . . . . . . . . . . . 3-29
Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29
Serial Protocol Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30

vii
Contents
Performer ASCII Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
Command Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
Command Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33
Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34
Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35
Performer Remote, TEN–20/20-TEN
Compatible Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37
TEN–20/20–TEN Serial Interface Protocol . . . . . . . . . . . . 3-38
Take Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39
Enable Protect Message . . . . . . . . . . . . . . . . . . . . . . . . . 3-40
Release Protect Message . . . . . . . . . . . . . . . . . . . . . . . . 3-40
Status Request Message . . . . . . . . . . . . . . . . . . . . . . . . . 3-41
Response Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42
TEN–XL ASCII Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-43
TEN–XL SMPTE Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-45
Model 100/110 Compatible Protocol. . . . . . . . . . . . . . . . . . 3-48
Model 200 Compatible Protocol. . . . . . . . . . . . . . . . . . . . . . 3-49
Model 300 Compatible Protocol. . . . . . . . . . . . . . . . . . . . . . 3-51
SMPTE 3245-E Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52
Notes About SMPTE Message Processing . . . . . . . . . 3-55
Performer Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . 3-58
Exchange Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-58
In Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-58
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-59
Index

viii
Contents

vii
Important Safeguards and
Regulatory Notices
Information on the following pages provides important safety
guidelines for both Operator and Service Personnel. Specific
warnings and cautions will be found throughout the manual
where they apply, but may not appear here. Please read and
follow the important safety information, noting especially those
instructions related to risk of fire, electric shock, or injury to
persons.
WARNING
Any instructions in this manual that require opening the
equipment cover or enclosure are for use by qualified service
personnel only.To reduce the risk of electric shock, do not
perform any servicing other than that contained in the
operating instructions unless you are qualified to do so.

viii
Safeguards and Notices
Symbols and Their Meaning
The lightning flash with arrowhead symbol, within an equilateral
triangle, alerts the user to the presence of “dangerous voltage”
within the product’s enclosure that may be of sufficient
magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle alerts the
user to the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the
appliance.
The fuse symbol indicates that the fuse referenced in text must be
replaced with one having the ratings indicated.
This symbol represents a protective grounding terminal. Such a
terminal must be connected to earth ground prior to making any
other connections to the equipment.
CAUTION
This equipment contains static sensitive components. Use anti-
static grounding equipment when handling or servicing modules
and components. When circuit modules are removed from the
frame, place them on a flat, static-controlled surface. Failure to
follow this precaution can result in component damage due to
electrostatic discharge.

ix
Safeguards and Notices
Warnings
■
Heed all warnings on the unit and in the operating
instructions.
■ Do not use this product in or near water.
■
Disconnect ac power before installing any options.
■
This product is grounded through the grounding conductor
of the power cord. To avoid electrical shock, plug the power
cord into a properly wired receptacle before connecting the
product inputs or outputs.
■
Route power cords and other cables so that they are not likely
to be damaged.
■
Disconnect power before cleaning. Do not use liquid or
aerosol cleaners; use only a damp cloth.
■
Dangerous voltages exist at several points in this product. To
avoid personal injury, do not touch exposed connections and
components while power is on.
■
Do not wear hand jewelry or watches when troubleshooting
high current circuits, such as the power supplies.
■
During installation, do not use the door handles or front
panels to lift the equipment as they may open abruptly and
injure you.
■
To avoid fire hazard, use only the specified correct type,
voltage and current rating as referenced in the appropriate
parts list for this product. Always refer fuse replacement to
qualified service personnel.
■
To avoid explosion, do not operate this product in an
explosive atmosphere unless it has been specifically certified
for such operation.
■
Have qualified personnel perform safety checks after any
completed service.
■
If equipped with redundant power, this unit has two power
cords. To reduce the risk of electric shock disconnect both
power supply cords before servicing.

x
Safeguards and Notices
Cautions
■
To prevent damage to equipment when replacing fuses, locate
and correct the trouble that caused the fuse to blow before
applying power.
■
Verify that all power supply lights are off before removing
power supply or servicing equipment.
■ Use only specified replacement parts.
■
Follow static precautions at all times when handling this
equipment.
■
Leave the back of the frame clear for air exhaust cooling and
to allow room for cabling. Slots and openings in the cabinet
are provided for ventilation. Do not block them.
■
Front door is part of fire enclosure and should be kept closed
during normal operation.
■
This product should be powered only as described in the
manual. To prevent equipment damage select the proper line
voltage at the ac input connector as described in the
Installation documentation.
■ To reduce the risk of electric shock, ensure that the two power
supply cords are each plugged into a separate branch circuit.
■
Circuit boards in this product may be populated with surface
mount and ASIC components. Special tools and techniques
are required to safely and effectively troubleshoot and repair
modules that use SMT or ASIC components. For this reason,
service and repair of GVG products incorporating surface
mount technology are supported only on a module exchange
basis. Customers should not attempt to troubleshoot or repair
modules that contain SMT components. GVG assumes no
liability for damage caused by unauthorized repairs. This
applies to both in- and out-of-warranty products.

xi
Safeguards and Notices
North American Power Supply Cords
This cord is supplied with a molded grounding plug (NEMA 5-
15P) at one end and a molded grounding connector (IEC 320-C13)
at the other. Conductors are CEE color coded, light blue (neutral),
brown (line), and green/yellow (ground). See the illustration.
Operation of this equipment at voltages exceeding 130 VAC will
require power supply cords which comply with additional
NEMA guidelines.
International Power Supply Cords
This cord is supplied with a molded grounding connector (IEC
320-C13) at one end and stripped conductors (50/5 mm) at the
other. Conductors are CEE color coded, light blue (neutral),
brown (line), and green/yellow (ground). Other IEC 320 C-13
type power supply cords can be used if they comply with the
safety regulations of the country in which they are installed. See
the illustration.
NOTE: When used in the United States, this cord is for 100 - 130VAC
use only.
When used internationally, this cord is for 100 - 130VAC or
200 - 240VAC (one line, one neutral, one earth).
Blue
Green with
Yellow stripe
Brown Line
Neutral
Ground
(Earth)

xii
Safeguards and Notices
EMC Regulatory Notices
Federal Communications Commission (FCC) Part 15 Information
This equipment has been tested and found to comply with the
limits for a Class A digital device pursuant to Part 15 of FCC
Rules.
These limits are designed to provide reasonable protection
against harmful interference in a commercial environment. This
equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio
communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user
will be required to correct the interference at his own expense.

xiii
Safeguards and Notices
Germany – FTZ
Hiermit wird bescheingt, dieses Gerät in Übereinstimmung mit
den Bestimmungen der Amtsblatt-Verfügung Vfg. 243/46 (1992)
funk-entstört ist. Der Deutschen Bundespost wurde das
inverkehrbringen dieses Gerätes angezeigt und die
Berechtingung zur Überprüfung der Serie auf Einhalten der
Bestimmungen eingeräumt.
We hereby certify that this equipment complies with the RFI
suppression requirements of Vfg. 243/46 (1992). The German
postal service was notified that the equipment is being marketed.
The German Postal Service has the right to re-test the equipment
and verify compliance.
Grass Valley Group, Inc.
P.O. Box 1114
Grass Valley, CA 95945
U.S.A.
HINWEIS FÜR DEN BENUTZER/BETREIBER: Die Vom
Betreiber zusammengestellte Anlage, innerhalb dieses Gerätes
eingesetzt wird, muß ebenfalls den Voraussetzungen Vfg. 243/46
(1992) genügen.
The German Postal Service requires that systems assembled by
the operator/user of this instrument must also comply with Postal
Regulation Vfg. 243/46 (1992).
HINWEIS FÜR DEN BENUTZER/BETREIBER: Dieses Gerät darf
in Meßaufbauten nur betrieben werden, wenn die
Voraussetzungen Vfg. 243/46 (1992) eingehalten werden.
The German Postal Service requires that this equipment, when
used in a test setup, may only be operated if the requirements of
Postal Regulation Vfg. 243/46 (1992) are complied with.

xiv
Safeguards and Notices

xv
Preface
2
About the Performer
™
Manual
The manual contains installation, operation, and service
instructions for Performer and its optional accessories and
control panels.
The manual contains the following sections.
■ Product Description—An overview of Performer,
including a functional description and a table of
specifications.
■ Installation—A comprehensive guide to uncrating,
installing, configuring, and cabling your Performer
system and its options.
■
Operation and Service—Aguide to using your Performer
system and information regarding service.
■ Index—An alphanumeric locator of subjects in this
manual.
In addition, a glossary of terms begins on the next page.

xvi
Preface
Glossary of Terms
The terms defined below are used in this manual. We have listed
them here for your convenience.
AC coupled A method of connecting one circuit to another so as to trans-
mit the varying AC characteristics of the signal while blocking
the static (DC) characteristics.
address An identification tag for separate devices sharing a common
communications bus.
ASCII (American Standard Code for Information Interchange) – A
standard system used extensively in data transmissions, in
which 128 letters, numerals, symbols, and special codes are
each represented by a binary number.
ASCII string A group of letters, numerals, and/or symbols represented by
ASCII code equivalents.
audio follow video An operational mode in which audio and video channels are
tied together so that when the operator selects the video
source, the audio simultaneously and automatically switches
with the video.
baud rate In terms of bits, the number of bits per second transmitted in
a digital signal.
binary A base-2 numbering system using the two digits 0 and 1, as
opposed to the ten digits, 0 through 9, in the decimal system.
BPS (Button Per Source) A router control panel that has a designat-
ed button for every controlled source.
breakaway The source number of at least one level (video, audio 1, or au-
dio 2) is different from the source number of one or both of the
other levels.
bus A signal path to which a number of devices (control panels,
routers, etc.) are connected.
channel In routing switchers, a complete and independent signal path.
controlled destinations Outputs that are assigned to a specific control panel.
destination offset The addresses of the destinations controlled by a control pan-
el which have been incremented to a higher set of numbers.
destination The point to which a source signal is routed.

xvii
Glossary of Terms
level offset The addresses of a level controlled by a control panel which
have been incremented to a higher set of numbers.
level(s) An independently controllable stratum of signals within a
routing switcher. Typically, a routing switcher will have a lev-
el of video and one or more audio levels.
MBCP (MultiBus Control Panel) A router control panel capable of
controlling multiple destinations. The destinations are select-
able on the front panel.
offset Where a set of numbers such as 1 through 10 are incremented
to another range of values such as 11 through 20.
parity A method of verifying the accuracy of transmitted or record-
ed data.
polling address A unique device designation that allows a controller to make
regular status checks of a number of devices on a common
communications bus.
protect The current selection is locked and prevented from accidental
change.
protocol A set of conventions governing the format and timing of mes-
sage exchanges to control data movements and detect errors.
RS232, RS422, RS485 Electrical/mechanical standards for serial communications.
serial bit rate The speed at which bits are transmitted in a serial digital sig-
nal.
SERIM (SERial Interface Module) Translates RS232 and RS422 com-
mands into RS485 format.
slave mode A condition in which a piece of equipment does not act inde-
pendently, but only under the control of another piece of
equipment.
source offset The addresses of the sources controlled by a control panel
which have been incremented to a higher set of numbers.
source The origin of a video &/or audio signal—i.e., video tape re-
corder, video camera, production switcher, etc..
stop bit The indicator in the serial digital communications protocol
that the transfer of one byte is complete.
tally The acknowledgement returned to a control panel or terminal
that an operation has been executed.

xviii
Preface
vertical interval strobe (VI) In relation to video switching applications, a signal sent
to indicate the beginning of the vertical interval.
video clamped Re-establishment of a fixed DC reference level for the video
signal.
X-Y mode A switching matrix which places inputs (sources) on an X axis
and outputs (destinations) on a Y axis. Routing connections
are made by specifying an X value to be connected to a Y val-
ue. Any available source can be connected to any available
destination.