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C553M-C (3/03) 9
OPERATION
CONTROL WITHOUT VIDEO
With this feature, the receiver can detect Coaxitron
®
commands from the controller when no video signal is present. Control
without video is mainly desired for the auxiliary function.
NOTE: The MPT9000, and the CM8500 and CM9500 families of controllers will transmit Coaxitron commands without reception
of video (composite sync) signal.
TRANSIENT SUPPRESSION
Transient suppression circuitry that has been designed into the LRD41A11-X receiver reduces the chance of interrupted
operation or damage to the receiver due to voltage spikes on the power and signal lines. Transient suppression does not imply
lightning suppression.
AUTO/RANDOM SCAN OPERATION
Depending on the type of control unit you have, auto and random scan can be operated in two ways:
• Use the Auto/Man switch or keys (if your control unit has these functions)
• Use presets
Auto/Man Switch – The random scan and auto scan functions are controlled by the same momentary switch on the control
panel labeled Auto and Man.
The first activation of the switch to the Auto position puts the pan/tilt into random scan. In random scan operation, the pan/tilt
travels between the preset limits with a random scan period of about 2 to 30 seconds, and a random dwell period of between 2
and 30 seconds. Following a dwell period, another random scan period starts. The direction of this scan period is also randomly
determined. When a pan limit is reached, scan direction reverses automatically.
A second activation of the Auto switch puts the pan/tilt into continuous duty auto scan (limit switch to limit switch). After
approximately 1/2 hour of auto scan, the circuit resets to random scan.
Subsequent operations of the Auto switch while in random scan mode cause a shift to auto scan mode and start the 1/2-hour
timer. Operating the Auto switch while in auto scan mode causes a shift to the random scan mode and zeros the 1/2-hour timer.
Presets – Auto and random scan also can be started by programming presets. The presets work only when your system is
configured for Extended (32-bit) Coaxitron mode.
Refer to your controller documentation for programming presets.
Preset 96 stops a scan.
Preset 97 starts random scan.
Preset 99 starts auto scan.
Advantages of random scan:
• Because scan direction, scan period, and dwell period are unpredictable, unauthorized activities or intrusions are
discouraged.
• Because of the reduced duty cycle, gear train wear, cable fatigue, drive motor wear, and temperature rise are reduced.
These factors all contribute to higher system reliability and increased equipment life.
TEST LOCAL CONTROL (TLC)
This feature allows you to connect an LRD41TLC test local control (TLC) module to the receiver to test the control of pan, tilt,
and lens functions locally. This is convenient for positioning limit stops, backfocusing, and troubleshooting the installation. The
TLC module also allows positioning of the camera locally.
To use the TLC module:
1. Plug the 16-pin connector from the TLC module into the TLC connector on the receiver (refer to Figure 5). You can plug in
the module when power for the receiver is turned on.
2. Hold down the keys on the TLC module to operate the pan, tilt, and camera functions. The receiver does not have to be
connected to other control equipment in order for the TLC module to work. If the receiver is connected to other control
equipment, the TLC module will override any transmitter control signals from the other control equipment.