Videoswitch VS - 12 User manual

Video Switch VST605C.DOC
VS Series 2
User Manual
This manual covers the following products:
VS - 12 2-Camera, 1 Monitor Switcher
VS - 14 4-Camera, 1 Monitor Switcher
VS - 16 6-Camera, 1 Monitor Switcher
VS - 28 8-Camera, 2 Monitor Switcher
VS - 12A 2-Camera, 1 Monitor Switcher, 2 Alarm Inputs
VS - 14A 4-Camera, 1 Monitor Switcher, 4 Alarm Inputs
VS - 16A 6-Camera, 1 Monitor Switcher, 6 Alarm Inputs
VS - 28A 8-Camera, 2 Monitor Switcher, 8 Alarm Inputs
This manual relates to switchers fitted with software revision R1.0.
Every effort has been made to ensure the accuracy of the information in this manual. However, Video
Switch Ltd assumes no liability for losses incurred as a result of out of date information, errors or
omissions. As part of a policy of continual product improvement, Video Switch Ltd reserves the right
to make changes to product specifications and documentation without notice.
No reproduction of this document or any portion of it is permitted without the specific written
permission of Video Switch Ltd.
©Video Switch Ltd 1996
Video Switch Ltd
Units 15-16 Redfields Industrial Park
Church Crookham Tel: [phone]
Hants GU52 ORD Fax: [phone]

Video Switch VST605C.DOC

Contents
1. OVERVIEW...............................................................................................................2
2. GETTING STARTED.................................................................................................3
3. MANUAL SWITCHING..............................................................................................4
3.1 Selecting Manual Mode......................................................................................................................... 4
3.2 Selecting Camera.................................................................................................................................. 4
4. AUTO SWITCHING...................................................................................................5
4.1 Auto Sequencing (Monitor A)................................................................................................................ 5
4.2 Set Dwell Time (Monitor A) ................................................................................................................... 5
4.3 Auto Sequencing (Monitor B)................................................................................................................ 5
4.4 Set Dwell Time (Monitor B) ................................................................................................................... 5
5. ALARM HANDLING ..................................................................................................6
5.1 Alarm Hold Time.................................................................................................................................... 6
5.2 Multiple Alarm Dwell Time..................................................................................................................... 6
5.3 Alarm Relay Hold Time ......................................................................................................................... 6
5.4 Unlatched Alarm Mode.......................................................................................................................... 7
5.5 Latched Alarm Mode............................................................................................................................. 7
6. ALARM CONNECTOR PIN-OUT..............................................................................8
7. SETUP OPTIONS.....................................................................................................9
7.1 Number of Cameras.............................................................................................................................. 9
7.2 Random Sequencing........................................................................................................................... 10
7.3 Alarm Modes....................................................................................................................................... 10
7.4 Interval Switching Mode...................................................................................................................... 10
7.5 SET Key Lockout................................................................................................................................. 10
7.6 Camera Termination ........................................................................................................................... 11
8. SPECIFICATIONS ..................................................................................................12
8.1 Auto Dwell Times ................................................................................................................................ 12
8.2 Alarm Hold Time.................................................................................................................................. 12
8.3 Alarm Cycle Time................................................................................................................................ 12
8.4 Alarm Relay Hold Time ....................................................................................................................... 12
8.5 DC Restoration.................................................................................................................................... 12
8.6 Camera Inputs..................................................................................................................................... 12
8.7 Monitor A Output(s)............................................................................................................................. 12
8.8 Alarm Inputs ........................................................................................................................................ 12
8.9 Alarm Outputs ..................................................................................................................................... 12
8.10 Power Requirements........................................................................................................................... 12
8.11 Dimensions.......................................................................................................................................... 12
8.12 Environmental ..................................................................................................................................... 13
9. SAFETY WARNING................................................................................................14

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1. Overview
The VS Series 2 compact desktop switchers are suitable for colour and monochrome
CCTV installations, and cater for two to eight cameras and one or two monitors.
Individual camera select keys are provided for the second monitor rather than just a
spot key, providing increased speed and convenience of camera selection.
Independent automatic sequencing on each monitor is possible and the cameras
that are to be included in each sequence may be specified. Random sequencing
may be specified if required. Independent dwell times are programmed via the front
panel keys and are stored digitally in non-volatile memory.
Advanced latched and unlatched alarm facilities are provided in all alarm models.
Alarm inputs are provided for connection to PIR or other detectors associated with
each camera. Alarm output relay contacts in the switcher permit control of an
external warning device or a VCR. The alarm hold time, cycle time and the relay hold
time are all independently programmable via the front panel keys and are stored
digitally in non-volatile memory.
The unlatched alarm mode is suitable for unattended operation as, in this mode, the
switcher reverts to normal operation when the alarms end. It may be used with both
manual and auto operation. In auto, all alarmed cameras will be sequenced. In
manual, the last alarmed camera will be selected. A flashing indicator provides a
visual indication of whether the selected camera currently has an alarm.
The latched alarm mode provides similar facilities but provides an audible and visual
warning which the operator must manually cancel.
These switchers are robustly constructed and have BNC connectors for cameras
and monitors, microprocessor control and bounce free interval switching in all
models. Most user options may be simply selected by means of switch settings.

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2. Getting Started
1/ Connect the switcher up as shown:
This diagram show the VS-28A. For other switchers, fewer camera inputs and
monitor outputs are available.
2/ Identify the 8 switches on the switcher which are visible through the cut-out in
the base of the unit near the front edge. Set all switches OFF except for
sections 1,2 and 3 which should ON (assuming 8 cameras).
3/ Switch ON the mains power. The switcher powers up in AUTO mode. Press a
camera select key to cancel the auto mode and view a particular camera.

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3. Manual Switching
3.1 Selecting Manual Mode
Select manual mode for Monitor A by pressing the “AUTO A” switch to turn off its
LED, or any one of the Monitor A camera select keys (lower row).
The VS-28 and VS-28A switchers cater for a second monitor. Manual mode for the
Monitor B output may similarly be selected by pressing the “AUTO B” switch to turn
off its LED, or any one of the any one of the Monitor B camera select keys (middle
row).
3.2 Selecting Camera
Press one of the Monitor A camera select keys, identified 1,2,3,4,5,6,7 & 8 (lower
row) to display the required camera on Monitor A.
The VS-28 and VS-28A switchers cater for a second monitor. Press one of the
Monitor B camera select keys, identified 1,2,3,4,5,6,7 & 8 (upper row) to display the
required camera on Monitor B.

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4. Auto Switching
4.1 Auto Sequencing (Monitor A)
To auto sequence press the “AUTO A” key. The unit will step from one camera to the
next with the previously programmed dwell time.
Only the number of cameras that have been enabled (see section 7.1) will be
selected in the sequence.
4.2 Set Dwell Time (Monitor A)
To set the auto sequence dwell time for monitor A, press and hold the “SET” key on,
then press and hold the “AUTO A” key on for the required dwell duration. The unit
will beep every second. When the required number of seconds has elapsed, release
both keys. When the keys are released, a double bleep confirms that the time period
has been permanently stored.
Note that the Auto Dwell time can not be set if the SET key is locked out (see section
7.3). The dwell time is remembered when the unit is turned off.
4.3 Auto Sequencing (Monitor B)
To auto sequence press the “AUTO B” key. The unit will step from one camera to the
next with the previously programmed dwell time.
Only the number of cameras that have been enabled (see section 7.1) will be
selected in the sequence.
4.4 Set Dwell Time (Monitor B)
To set the auto sequence dwell time for monitor A, press and hold the “SET” key on,
then press and hold the “AUTO B” key on for the required dwell duration. The unit
will beep every second. When the required number of seconds has elapsed, release
both keys. When the keys are released, a double bleep confirms that the time period
has been permanently stored.
Note that the Auto Dwell time cannot be set if the SET key is locked out (see section
7.3). The dwell time is remembered when the unit is turned off.

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5. Alarm Handling
On the VS-12A, VS-14A, VS-16A and VS-28A, an alarm input is provided for each
camera. These are for connection to normally open contacts, typically provided by
PIR or other types of detector. When a contact closes, an alarm condition is
triggered on that channel.
5.1 Alarm Hold Time
When an alarm condition selects a full screen display of a camera, this display is
held for the duration of the Alarm Hold Time. If multiple alarms occur, each is
sequentially displayed and held for this time period. The purpose of the Alarm Hold
Time is to ensure that each camera is displayed for a minimum amount of time even
if other alarms occur within a short period of time.
To set the Alarm Hold Time, press and hold the SET key and then also press and
hold the Camera 1 key. Keep both keys held for the required duration. Every second
the switcher will bleep. When the keys are released, a double bleep confirms that the
time period has been permanently stored.
Note that the Alarm Hold Time can not be set if the SET key is locked out (see
section 7.3). The Alarm Hold time is remembered when he unit is turned off.
5.2 Multiple Alarm Dwell Time
When there is more than one alarm, and each alarmed camera has been displayed
in full screen mode for the Alarm Hold Time, the switcher will then sequence
between the alarmed cameras, holding on each for the Multiple Alarm Dwell Time.
This will continue for as long as alarm conditions persist or in latched mode, until
someone presses a key to manually cancel the alarms. When all alarms have
cleared, the switcher will revert to its prior operating condition.
To set the Multiple Alarm Dwell Time, press and hold the SET key and then also
press and hold the Camera 2 key (in the case of the VS-12A, press both the Camera
1 and 2 keys). Keep the keys held for the required duration. Every second the
switcher will bleep. When the keys are released, a double bleep confirms that the
time period has been permanently stored.
Note that the Multiple Alarm Dwell time can not be set if the SET key is locked out
(see section 7.3). The Alarm Dwell time is remembered when he unit is turned off.
5.3 Alarm Relay Hold Time
When an alarm first occurs, the alarm relay in the switcher will activate. When all
alarms have cleared, the relay will stay energised for the further duration of the
Alarm Relay Hold Time.
To set the Alarm Relay Hold Time, press and hold the SET key and then also press
and hold the Camera 3 key (in the case of the VS-12A, use the camera 2 key). Every
second the switcher will bleep. If the keys are released after just one beep, a relay

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hold time of zero will be stored. Further beeps each represent 10 seconds of relay
hold time. For example, if the keys are held for a total of seven beeps, this will result
in a hold time of sixty seconds (1 minute). If they are held for a total of thirteen
beeps, this will result in a hold time of 2 minutes.
When the keys are released, a double bleep confirms that the specified time period
has been permanently stored.
Note that the Alarm Relay Hold time can not be set if the SET key is locked out (see
section 7.3). The Alarm Relay Hold time is remembered when he unit is turned off
5.4 Unlatched Alarm Mode
The unlatched alarm mode is suitable for unattended operation as in this mode, the
switcher automatically reverts to normal operation when the alarms end. The audible
bleeper is not sounded in unlatched mode.
5.5 Latched Alarm Mode
The latched alarm mode provides the same facilities as the unlatched mode but
requires that an operator manually cancels the alarm conditions. All alarms will be
remembered by the unit until the SET key is pressed. Only alarms that are still
present will then be acted upon.
If any latched or current alarms exist, an internal bleeper beeps once per second.

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6. Alarm Connector Pin-out
The VS-12A, VS-14A and VS-28A have alarm inputs and outputs to which
connection is made via the 25-way D-type connector on the rear of the unit. The pin
numbers are detailed below (note that the VS-12, VS-16 and VS-28 are fitted with
only a dummy connector).
View of Female 25-way D-type Connector on rear of switcher:
Signal Pin
Alarm Input 1 8
Alarm Input 2 21
Alarm Input 3 9
Alarm Input 4 22
Alarm Input 5 10
Alarm Input 6 23
Alarm Input 7 11
Alarm Input 8 24
Alarm Common (Ground) 20
Relay N/O Contact 12
Relay N/C Contact 13
Relay Common 25

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7. Setup Options
The switcher is provided with an 8-way DIL switch (referenced as S21) for setting
various user options. It is accessible via a cut-out in the base of the unit near the
front.
7.1 Number of Cameras
Use these three switches to specify the number of cameras in the system. If there
are less than eight cameras, connect them to consecutive camera inputs, starting
with input 1.
Number of Cameras S21-1 S21-2 S21-3
*Programmable OFF OFF OFF
2 ON OFF OFF
3 OFF ON OFF
4 ON ON OFF
5 OFF OFF ON
6 ON OFF ON
7 OFF ON ON
8 ON ON ON
*The Programmable option allow the operator to individually specify which cameras
are to be sequenced on the Monitor A output and which cameras are to be
sequenced on the Monitor B output:
Specify Monitor A cameras to be sequenced:
(a) Press and hold the AUTO A key.
(b) Press and hold the SET key
(c) Press the Monitor A cameras keys (1-8) as required to turn on and off the
cameras LEDS. Turn on all the LEDs corresponding to cameras that you wish
to be sequenced.
(d) Release all keys. Two audible bleeps indicate that the setting has been stored
(4 bleeps indicate an error. If this happens, perform all settings again).
(e) Set the dwell time to the required period using the SET and AUTO A keys
only.
Specify Monitor B cameras to be sequenced (VS-28 and VS-28A only):
(a) Press and hold the AUTO B key.
(b) Press and hold the SET key

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(c) Press the Monitor B cameras keys (1-8) as required to turn on and off the
cameras LEDS. Turn on all the LEDs corresponding to cameras that you wish
to be sequenced.
(d) Release all keys. Two audible bleeps indicate that the setting has been stored
(4 bleeps indicate an error. If this happens, perform all settings again).
7.2 Random Sequencing
The switchers are provided with a random sequence mode which can be used on
both Monitor A and Monitor B. This mode is useful when a monitor is on public
display for deterrence purposes. The psuedo random sequence is designed to
ensure that all cameras will be selected with equal frequency by in a unpredictable
order.
Set this switch ON if you want cameras sequence randomly, and set it OFF if you
want camera to sequence in normal order (1,2,3 etc):
S21-5 Sequence Mode
OFF Normal
ON Random
7.3 Alarm Modes
Set this switch OFF if you do not want alarms latched and if you do not require
audible indication of the alarms. Set this switch ON if you require alarms to be
remembered until manually acknowledged by an operator, and if you want an
audible warning of alarms.
S21-6 Alarm Mode
OFF Unlatched
ON Latched
7.4 Interval Switching Mode
This switch should be set OFF if the cameras are synchronised (gen-locked). It
should be set ON if the cameras are not synchronised to avoid picture bounce during
switching of live full screen images.
S21-7 Interval Switching Mode
OFF Immediate switch-over at vertical sync
ON Blank fields inserted between vertical sync pulses
during switch-over
7.5 SET Key Lockout
In order to set the cameras selections and the dwell times for normal sequencing
and alarm handling, switch S21-7 should be turned OFF. Once the required settings

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have been made, it is advisable to set the lockout switch to ON to avoid accidental
alteration of any of the settings.
S21-8 SET Key Lockout
OFF SET key not locked out
ON SET key can only be used to clear
alarms
7.6 Camera Termination
An 8-way DIL switch (referenced as S1) is provided within the switcher (near the
rear) to allow camera inputs to be individually terminated or unterminated.
Switch Camera
Input OFF ON
S1-1 1 Not Terminated 75 Ohm Termination
S1-2 2 Not Terminated 75 Ohm Termination
S1-3 3 Not Terminated 75 Ohm Termination
S1-4 4 Not Terminated 75 Ohm Termination
S1-5 5 Not Terminated 75 Ohm Termination
S1-6 6 Not Terminated 75 Ohm Termination
S1-7 7 Not Terminated 75 Ohm Termination
S1-8 8 Not Terminated 75 Ohm Termination

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8. Specifications
8.1 Auto Dwell Times
1 second to 255 seconds (4 minutes approx)
8.2 Alarm Hold Time
1 second to 255 seconds (4 minutes approx)
8.3 Alarm Cycle Time
1 second to 255 seconds (4 minutes approx)
8.4 Alarm Relay Hold Time
0 seconds to 2550 seconds (40 minutes approx)
8.5 DC Restoration
Outputs are DC restored to <100mV.
8.6 Camera Inputs
1V pk-pk, +3V maximum DC offset, terminated by 75 Ohms (terminations may be
removed on a per camera basis). The switchers expects standard PAL colour or
monochrome video signals.
8.7 Monitor A Output(s)
1V pk-pk Composite Video when terminated by 75 Ohms
8.8 Alarm Inputs
Normally open contacts required to activate alarm inputs (internally pulled up to 5V
via 10K Ohms resistors)
8.9 Alarm Outputs
Change-over relay contacts, rated at 500mA, 24 Volts ac/dc
8.10 Power Requirements
220/240Vac 50/60Hz 10W (110Vac available as an option)
8.11 Dimensions
190 mm (wide) x 145 mm (deep) x 60 mm (high)

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8.12 Environmental
Operating Temperature 0 to +40°C
Storage Temperature -20 to +70°C
Humidity 5% to 95% non-condensing

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9. Safety Warning
Before connecting the mains supply to the unit, check that the supply voltage
corresponds with the voltage indicated on the power rating label on the unit.
To avoid the risk of electric shock, the mains supply must be disconnected from
the unit before the cover is removed.
This equipment must be earthed.
The unit is protected with an internally mounted mains fuse. For continued
protection against the risk of fire, replace only with the same type and rating of
fuse.
This product is supplied with a moulded 13 Amp plug (fitted with a 5A mains fuse)
for connection to a standard mains socket outlet. Should the plug not be of the
correct type, the plug may be removed and the cable re-wired to a suitable plug.
The wires in the power cable are coloured in accordance with the following code:
Green and Yellow Earth (E)
Blue Neutral (N)
Brown Live (L)