A security system is provided for a cargo container having a door. An
electronic control unit is provided for monitoring the locked status of
the door. The electronic control unit is operably communicable with a
remote computer terminal. A first software control program is located
within the electronic control unit to monitor the locked status of the
door. A second software control program is located within the remote
computer terminal and is capable of retrieving activity and functions
from the first software control program. A protocol is provided to
facilitate communication between the electronic control unit and the
remote computer terminal.