Videoswitch VT - Manual (Page 3)

VT Series 2 User Manual Page 3
Videoswitch
VT601c.doc
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.