A vehicle-based control system and method for use with a barrier operating
system that includes a motor, a receiver in communication with the motor,
and a remote transmitter for transmitting an activation signal to the
receiver. The activation signal includes a radio frequency carrier signal
modulated with a codeword for use in activating the motor to open and
close the barrier. A vehicle-mounted transceiver receives multiple radio
frequency carrier signals, and transmits an activation signal for receipt
by the barrier operating system receiver. A vehicle-mounted controller
stores the received radio frequency carrier signals, and receives user
input identifying an activation scheme having a variable codeword format.
The controller generates a variable codeword based on the identified
activation scheme, selects one of the stored carrier signals, and
controls the transceiver to transmit an activation signal having the
selected carrier signal modulated with the generated variable codeword in
response to user input.