VT Series 2 User Manual Page 1 VT Series 2 User Manual This manual covers the following products: VT - 11 VT - 14A VT - 18A VT - 28A 1-Camera, 1 Monitor Telemetry Transmitter 4-Camera, 1 Monitor Telemetry Transmitter 8-Camera, 1 Monitor Telemetry Transmitter 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.
VT Series 2 User Manual Page 2 Contents 1. 2. OVERVIEW................................................................................................................................... 3 INSTALLATION........................................................................................................................... 4 2.1 2.2 2.3 Coax Telemetry..........................................................................................................................................................
VT Series 2 1. User Manual Page 3 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.
VT Series 2 2. User Manual Page 4 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).
VT Series 2 User Manual Page 5 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.
VT Series 2 User Manual Page 6 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 near the transmitter) is used to expand the single twisted pair telemetry output of the transmitter into individual outputs for each receiver.
VT Series 2 3. User Manual Page 7 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.
VT Series 2 4. User Manual Page 8 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.
VT Series 2 User Manual Page 9 4.4 Presets Up to eight presets may be called by pressing the preset keys (identified 1, 2, 3, 4, 5, 6,7 and 8). When a new preset is selected, the receiver will move to the previously stored preset position (to program presets see section 7.11). If more than one preset is selected, the receiver will patrol between all selected presets with a programmable time (to set preset dwell time see section 7.10).
VT Series 2 5. User Manual Page 10 Alarm Handling On the VT-14A, VT-18A and VT-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 and preset may be called up on the associated receiver if required (section 0). 5.
VT Series 2 6. User Manual Page 11 Switcher SET Operations (not VT-11) The SET key is used to configure various aspects of the switcher. Note that the SET key lockout (section 8.5) must be turned off before any of these actions can be performed. When the keys are released after a switcher related SET function, there should be two audible bleeps. An error condition is indicated by four bleeps. If this occurs, repeat the setting. 6.
VT Series 2 User Manual Page 12 6.6 Set Multiple Alarm Dwell Time To set the Multiple Alarm Dwell Time, press and hold the SET key and then also press and hold the Monitor A Camera 2 key: [SET] and [Camera 2] Keep the keys held for the required duration. Every second the transmitter will bleep. 6.7 Set Alarm Relay Hold Time To set the Alarm Relay Hold Time, press and hold the SET key and then also press and hold the Monitor A Camera 3 key: [SET] and [Camera 3] Every second the transmitter will bleep.
VT Series 2 7. User Manual Page 13 Receiver SET Operations All receiver set-up functions involve pressing the SET key and one or more other keys in combination. Note that the SET key lockout (section 8.5) must be turned off before any of these actions can be performed. For all receiver SET operations, always first press and hold down the SET key. Then press the other key(s) as described in the following sections, holding them for about a second to ensure the command has been recognised by the receiver.
VT Series 2 User Manual Page 14 [SET], [FOCUS↑] and [Preset 1, 2, 3, 4, 5, 6, 7 or 8] The higher the number selected, the faster the focus rate. 7.6 Zoom Polarity If, when the upper and lower zoom keys are pressed, the zoom acts in the opposite direction to that expected, the polarity may be reversed: To select normal polarity press: [SET], [ZOOM↑] and [Joystick Up] To select reverse polarity by press: [SET], [ZOOM↑] and [Joystick Down] 7.
VT Series 2 User Manual Page 15 remembered by the receiver (5 seconds minimum, to a resolution of 5 seconds) and used as the patrol dwell time. Before setting the time you must set AUX2 Off. To start the timer press: [SET], [LAMP] and [AUTOPAN] After the required time has elapsed, stop the timer by pressing: [SET], [LAMP] and [WIPE] 7.11 Alarm Patrol Timer The alarm patrol dwell timer is set by issuing a command to start a timer, then issuing another command to stop it.
VT Series 2 8. User Manual Page 16 Switch Options The transmitter is provided with DIL switches, accessible via cut-outs in the base of the unit, for setting various user options. The VT-11 has two DIL switches: • S2 is a 2-way switch located near the rear of the transmitter. • S3 is a 4-way switch located near the front of the transmitter.
VT Series 2 User Manual Page 17 8.1 Number of Cameras Three switch sections are used 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.
VT Series 2 User Manual Page 18 8.4 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. S1-7 Interval Switching Mode OFF Immediate switch-over at vertical sync ON Blank fields inserted between vertical sync pulses during switch-over 8.5 SET Lockout All SET function for both the switcher set-up and receiver set-up can be locked out.
VT Series 2 User Manual Page 19 8.7 Preset on Alarm (not VT-11) When an alarm is detected by the transmitter, preset 1 may automatically be called up. Note that if alarm presets are being used, this switch should be off, as the alarm preset option will perform preset selection at the receiver. S3-1 Preset on alarm OFF Presets unaffected on alarm ON Preset 1 (only) is selected on alarm 8.
VT Series 2 9. User Manual Page 20 Test Mode The transmitter has a special test mode which allows the calibration of the joystick to be checked and also permits the lens offset voltages of the receivers to be adjusted. This mode should only be used with great care. To enter test mode, turn on the transmitter while holding on the LAMP, ALARMS, WIPE and AUTOPAN keys. Exit test mode as soon as test mode operations have been complete. To exit, turn off the unit for 5 seconds, then turn on again. 9.
VT Series 2 User Manual Page 21 10. Connector Pin-outs 10.1 Alarm Connector View of Female 25-way D-type Connector on rear of transmitter (not VT-11): Signal Alarm Input 1 Alarm Input 2 Alarm Input 3 Alarm Input 4 Alarm Input 5 Alarm Input 6 Alarm Input 7 Alarm Input 8 Alarm Common (Ground) Alarm Output - Relay N/O Contact Alarm Output - Relay N/C Contact Alarm Output - Relay Common Pin 8 21 9 22 10 23 11 24 20 12 13 25 10.
VT Series 2 User Manual Page 22 11. Specifications 11.1 Telemetry 11.1.1 Coax Telemetry Output 500kHz on-off keying during vertical blanking interval, transmitted to camera currently selected on monitor A. 11.1.2 Twisted Pair Telemetry Output RS232 or 20mA Current Loop. 7.8kbaud or 2400 baud. Data format: 1 start bit, 8 data bits, 1 parity bit, 1 stop bit. 11.1.3 Twisted Pair Telemetry Slave Input Connect to twisted pair telemetry output of slave transmitter.
VT Series 2 User Manual Page 23 12. Safety Warning q 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. q To avoid the risk of electric shock, the mains supply must be disconnected from the unit before the cover is removed. q This equipment must be earthed. q The unit is protected with an internally mounted mains fuse.
Videoswitch VT601c.
