Videoswitch VT User Manual

VT Series 2 User Manual Page 1

VT Series 2

User Manual

This manual covers the following products:

VT - 11 1-Camera, 1 Monitor Telemetry Transmitter
VT - 14A 4-Camera, 1 Monitor Telemetry Transmitter
VT - 18A 8-Camera, 1 Monitor Telemetry Transmitter
VT - 28A 8-Camera, 2 Monitor Telemetry Transmitter

This manual relates to transmitters fitted with software revisions R2.1 to R2.4

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assumes no liability for losses incurred as a result of out of date information, errors or omissions.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, 2002

Video Switch Ltd
Units 15 & 16 Redfields Industrial Park
Church Crookham Tel: [phone]
Hants GU52 ORD Fax: [phone]

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Contents

1. OVERVIEW................................................................................................................................... 3

2. INSTALLATION........................................................................................................................... 4

2.1 Coax Telemetry.............................................................................................................................................................................................................4

2.2 Daisy Chain Twisted Pair Telemetry...........................................................................................................................................................................5

2.3 Star Configuration Twisted Pair Operation..................................................................................................................................................................6

3. SWITCHING .................................................................................................................................7

3.1 Manual Switching.........................................................................................................................................................................................................7

3.2 Auto Switching .............................................................................................................................................................................................................7

4. TRANSMITTER OPERATION.................................................................................................... 8

4.1 Pan and Tilt...................................................................................................................................................................................................................8

4.2 Zoom, Iris and Focus....................................................................................................................................................................................................8

4.3 Auxiliary Functions......................................................................................................................................................................................................8

4.4 Presets............................................................................................................................................................................................................................9

5. ALARM HANDLING.................................................................................................................. 10

5.1 Unlatched Alarm Mode.............................................................................................................................................................................................. 10

5.2 Latched Alarm Mode................................................................................................................................................................................................. 10

5.3 Alarm Processing....................................................................................................................................................................................................... 10

6. SWITCHER SET OPERATIONS (NOT VT-11) ....................................................................... 11

6.1 Specify Cameras for Monitor A................................................................................................................................................................................. 11

6.2 Specify Cameras for Monitor B (VT-28A only)....................................................................................................................................................... 11

6.3 Set Monitor A Dwell Time........................................................................................................................................................................................ 11

6.4 Set Monitor B Dwell Time (VT-28A only) .............................................................................................................................................................. 11

6.5 Set Alarm Hold Time................................................................................................................................................................................................. 11

6.6 Set Multiple Alarm Dwell Time................................................................................................................................................................................ 12

6.7 Set Alarm Relay Hold Time...................................................................................................................................................................................... 12

7. RECEIVER SET OPERATIONS ............................................................................................... 13

7.1 Video Gain................................................................................................................................................................................................................. 13

7.2 Video Lift................................................................................................................................................................................................................... 13

7.3 Zoom Speed ...............................................................................................................................................................................................................13

7.4 Iris Speed.................................................................................................................................................................................................................... 13

7.5 Focus Speed ...............................................................................................................................................................................................................13

7.6 Zoom Polarity............................................................................................................................................................................................................ 14

7.7 Iris Polarity................................................................................................................................................................................................................. 14

7.8 Focus Polarity............................................................................................................................................................................................................ 14

7.9 Preset Training...........................................................................................................................................................................................................14

7.10 Preset Patrol Timer ....................................................................................................................................................................................................14

7.11 Alarm Patrol Timer.................................................................................................................................................................................................... 15

7.12 Set Presets ..................................................................................................................................................................................................................15

8. SWITCH OPTIONS .................................................................................................................... 16

8.1 Number of Cameras................................................................................................................................................................................................... 17

8.2 Random Sequencing.................................................................................................................................................................................................. 17

8.3 Alarm Modes.............................................................................................................................................................................................................. 17

8.4 Interval Switching Mode............................................................................................................................................................................................ 18

8.5 SET Lockout.............................................................................................................................................................................................................. 18

8.6 Camera Termination..................................................................................................................................................................................................18

8.7 Preset on Alarm (not VT-11) ..................................................................................................................................................................................... 19

8.8 Master/Slave Operation............................................................................................................................................................................................. 19

8.9 Twisted Pair Telemetry Baud Rate........................................................................................................................................................................... 19

9. TEST MODE................................................................................................................................ 20

9.1 Joystick Calibration Check........................................................................................................................................................................................20

9.2 Lens Offset Adjust ..................................................................................................................................................................................................... 20

10. CONNECTOR PIN-OUTS .......................................................................................................... 21

10.1 Alarm Connector........................................................................................................................................................................................................21

10.2 Telemetry Connector ................................................................................................................................................................................................. 21

11. SPECIFICATIONS...................................................................................................................... 22

11.1 Telemetry................................................................................................................................................................................................................... 22

11.2 Switcher...................................................................................................................................................................................................................... 22

11.3 Video Inputs & Outputs............................................................................................................................................................................................. 22

11.4 Alarms........................................................................................................................................................................................................................ 22

11.5 Power Requirements.................................................................................................................................................................................................. 22

11.6 Dimensions................................................................................................................................................................................................................. 22

11.7 Environmental............................................................................................................................................................................................................ 22

12. SAFETY WARNING................................................................................................................... 23

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1. Overview

The VT Series 2 desktop telemetry transmitters are used in conjunction with Video Switch receivers to
provide remote control of pan & tilt, zoom, iris, focus and auxiliary functions.

The VT-11 controls a single camera, whereas the VT-14A, VT-18A and VT-28A incorporate a fully
featured switcher section which permit a number of cameras to be selected and controlled.

Transmitter Section

The transmitters send telemetry control information to receivers. The receivers decode this information
and drive the pan and tilt heads, lens and auxiliary functions accordingly. The telemetry information is sent
either via the coax that is used to send back the video, or via additional twisted pair cables (RS232 and
20mA). Whichever telemetry method is employed, more than one transmitter may be used to provide
multiple (master/slave) control points.

The transmitters all have a joystick for the control of pan and tilt. Keys are provided for zoom, iris and
focus control, and also for five auxiliary functions. The receivers and their presets, if installed, are set up at
the transmitter by key combinations. A security lockout feature is provided to prevent inadvertent
alteration of these settings.

Switcher Section (not VT-11)

All models except the VT-11 provide bounce free manual or automatic switching (sequential or random).
Front panel programming specifies the dwell time and which cameras are to be included in the auto
sequence for each monitor. The security lockout features also prevents inadvertent alteration of these
settings.

Alarm inputs are provided for connection to PIR or other detectors associated with each camera. Alarm
output relay contacts in the transmitter 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.

Two alarm modes are provided, the unlatched mode being suitable for unattended operation as, the
transmitter reverts to normal operation when the alarms end. The latched alarm mode provides an audible
warning which the operator must manually acknowledge.

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2. Installation

The transmitters may be connected to the receivers in a number of different configurations depending on
how the telemetry control is to be transmitted to the receivers. These configurations are described below.

2.1 Coax Telemetry

Coax telemetry is the simplest and is suitable where there is a direct coax link between each receiver and
the transmitter (earth loop isolating transformers may be used in the coax lines if there are required).

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2.2 Daisy Chain Twisted Pair Telemetry

If the video returns to the transmitter via links other than coax cables, then the telemetry must be
transmitted to the receivers via twisted pair links.

The daisy chain configuration requires, in addition to the video cabling, a twisted pair link from the
transmitter to one of the receivers, and then further twisted pair links from each receiver to the next.
Where twisted pair cables are shown in the diagram, these could in fact be data links utilising as fibre­optic, microwave, infra-red, leased line, ISDN or PSTN etc. which provide a compatible interface (20mA
loop or RS232).

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2.3 Star Configuration Twisted Pair Operation

If the video returns to the transmitter via links other than coax cables, then the telemetry must be
transmitted to the receivers via twisted pair links.

In the star configuration, a VX-18 star expander (typically located ne ar the transmitter) is used to expand
the single twisted pair telemetry output of the transmitter into individual outputs for each receiver. Each
output connects to a receiver via a twisted pair cable or compatible data link.

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3. Switching

3.1 Manual Switching

Individual camera select keys are provided for all cameras (not applicable to VT-11). The VT-28A caters
for two monitors and provides a second row of camera select keys.

3.1.1 Manually Selecting a Camera (Monitor A)

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. Auto mode will be cancelled if previously set.

The selected camera is the one which the telemetry transmitter can now control.

3.1.2 Manually Selecting a Camera (Monitor B)

The VT-28A transmitter caters 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. Auto mode will be
cancelled if previously set.

3.2 Auto Switching

Auto switching may be used independently on either or both monitors. The dwell time for each monitor
may also be programmed, together with which cameras are required to be selected for each monitor
(section 8.1). Either sequential or random switching may be specified (section 8.2).

3.2.1 Auto Switching (Monitor A)

To set monitor A to auto, press the “AUTO A” key. The unit will step from one camera to the next with
the previously programmed dwell time.

Only the cameras that have been enabled (see section 8.1) will be selected in the sequence.

3.2.2 Auto Switching (Monitor B)

To set monitor B to auto, press the “AUTO B” key. The unit will step from one camera to the next with
the previously programmed dwell time.

Only the cameras that have been enabled (see section 8.5) will be selected in the sequence.

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4. Transmitter Operation

4.1 Pan and Tilt

The joystick is used for pan and tilt control of the camera. Note that the joystick must be in its central
position when the transmitter is turned on.

AC Receivers

Movement of the joystick by a small amount in any direction causes the pan and tilt head to move
accordingly. The amount that the joystick is moved has no effect on the operation of the head.

DC Receivers

When the transmitter is used with a DC receiver (e.g. VR-5) providing variable speed control, then the
amount the joystick is moved in a particular direction will control the speed at which the pan and tilt head
moves.

4.2 Zoom, Iris and Focus

Six keys are provided for the control of lens functions.

4.2.1 Zoom

These keys control the zoom in and out of the currently selected camera. Both the zoom speed (section

7.3) and the polarity (section 7.6) may be set.

4.2.2 Iris

If the lens uses auto-iris, these keys are not used. If the lens has manual iris control, then these keys open
and close the iris of the currently selected camera. Both the iris speed (section 7.4) and the polarity
(section 7.7) may be set.

4.2.3 Focus

These keys control the focus in and out of the currently selected camera. Both the focus speed (section

7.5) and the polarity (section 7.8) may be set.

4.3 Auxiliary Functions

Five auxiliary functions may be controlled from the transmitter (the VR-3 supports only AUX1 and
AUX3). The auxiliary keys all have predesignated functions, but may be used to control any other devices
(within the power rating of the relays in the receiver).

4.3.1 AUX 1 (Lamp)

This is a latched function which operates a relay in the receiver that may be used to control a lamp or any
other device.

4.3.2 AUX 2 (Preset Alarms)

This latched function is used to switch the alarm detection on and off where an alarm preset option is
fitted. If an alarm preset is not being used, the relay in the receiver operated by this function may be used
to control any device.

4.3.3 AUX 3 & 4 (Wipe/Wash)

A single key is used to control two functio ns, wipe and wash. The wipe relay is latched and toggles on and
off each time the keys is pressed. If the key is held on for more than a second, the wash relay will operate
until the key is released again. If wash and wipe are not required, the relays may be used to control any
other device.

4.3.4 AUX 5 (Autopan)

This is a latched function which operates a relay in the receiver. It is typically used to control an autopan
module, but may be used to operate any other device. Note that when left or right panning is performed, if
a preset is selected or if an alarm occurs, this function is cancelled.

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