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3. OPERATION
This section describes the operation of the DPT 115 and related system components. The DPT
115 receives serial data commands from one of two sources in all applications, a hardware
controller or a computer system. The pan and tilt unit will accept RS-232, RS-422 or both.
Functions of the pan and tilt include manual camera positioning, manual zoom and focus control,
and presets. Presets are stored pan, tilt, zoom, and focus positions that the DPT 115 will return to
automatically when recalled. The preset data is stored within the pan and tilt head. This data is
stored and recalled from the controller or computer system.
3.1 C
ONTROLLER
A controller is a device designed exclusively to provide ASCII serial commands to the pan and
tilt. These units generally have a joystick for up, down, left, and right direction commands. There
will also be some form of seesaw or switch controls for zoom and focus. Switches will also be
provided for preset control. The controller will transmit commands in RS-232 or RS-422
formats.
3.1.1 RS-422
RS-422 format is a balanced four wire interface. The signals are transmit plus, transmit minus,
receive plus, and receive minus. This interface is typically 26 AWG wire with a distance
limitation of 2000 feet.
3.1.2 RS-232
RS-232 format is a three wire single ended interface. The signals are transmit receive, and
ground. This interface is typically 20-24 AWG wire with a distance limitation of 100-200 feet.
3.2 C
OMPUTER
A computer can also be used to provide ASCII serial commands to the pan and tilt. Software
may be written to output the serial command over the serial port to remotely control the pan and
tilt. A computer program is available from the manufacturer that will allow a user to operate the
pan and tilt via the serial port of their personal computer. To obtain a copy of this program call
the manufacturer at the technical support center.
3.3 SYSTEM TEST
3.3.1 Power “ON” Test
Apply power to the pan and tilt electronics by activating the slide switch on the base of the pan
and tilt. The power green power LED should illuminate indicating the unit has DC power. The
red LED will flash once during power up.
2/12/05 Document D0153
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