Motorola HPD 1000 User Manual page 17

5 Any disconnect of a Communication Cable or turning the
computer OFF, will cause HPD to start an off period of 6
seconds before it finally turns off. If the cable is
re-attached or the computer is turned back ON during
these 6 seconds, HPD will remain on.
6 If the Car Battery Voltage drops below 10V, the modem will
turn OFF and stay OFF until Battery voltage is above 10V
again.
7 If Ignition is removed, HPD will turn OFF.
HPD™ 1000 Modem
Status Applet and Features
11