Code Hopping Explained; High Frequency; Programming Options - DEI 600HF Owner's Manual

Code Hopping
Your system receiver and transmitters use a mathematical formula called an
algorithm to change their code each time the transmitter is used. This tech-
nology has been developed to increase the security of the unit. The control
unit knows what the next codes should be. This helps to keep the transmitter
"in sync" with the control unit even if you use the remote control out of range
of the vehicle. However, if the transmitter has been pressed many times out
of range of the vehicle, or the battery has been removed, it may get out of
sync with the control unit and fail to operate the system. To re-sync remote
control simply press the arm/disarm button of the transmitter several times
within range of the vehicle. The alarm will automatically re-sync and respond
to the transmitters normally.

High Frequency

Your system transmits and receives at 434 MHz. This provides a cleaner
spectrum with less interference and a more stable signal. Enjoy a phenome-
nal increase in range-even in areas with high radio interference.

Programming Options

Programming options control what your system does during normal opera-
tion, and require little or no additional parts. However, some may require addi-
tional installation labor.
The following is a list of the programmable options, with the factory settings
in bold.
• Active arming (only with the transmitter) or passive arming (automatic
arming 30 seconds after the last door has been closed).
• Arming/disarming confirmation siren chirps on or off.
• Passive door locking (with passive arming) or active door locking (only
when arming with the transmitter). This feature only works if passive arm-
ing has been selected for step one.
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™ Explained
© 1990, 1996 Directed Electronics, Inc.