Wiring for Screen Blanking

To use screen blanking, connect one of the two DB9 serial ports (using CA1300 Screen Blanking cable) on the device to a switch. Activate this switch electrically (for example, motion sensor) or mechanically (for example, pedal switch) when the vehicle is in motion.

1	DB9 Cable
2	Lines to screen-blanking sensor (optional). Only CTS and RTS signals are used.
3	User-supplied switch/relay that will provide an electrical conductive connection when the vehicle is in motion.
4	Lines to ignition switch (optional)
5	Power Cable

For customers migrating to the VC8300 from an Zebra 8515, 8525, 8535 vehicle mount computer, or a 753x hand-held computer cradle:

If the screen blanking feature was used previously, ensure that you are no longer feeding the screen blanking signals to the VC8300 main DC power cable. Rewire the screen blanking inputs to the VC8300 DB-9 serial port through the DB-9 screen blanking cable. In previous generations of vehicle-mount computers, the screen blanking signals were fed into the terminal through 2 of the 4 wires in the CPC connector of the DC power cable. This no longer applies to the VC8300.

The screen blanking feature makes use of either one of the DB-9 ports to monitor electrical relay closure. When enabled, the CTS/RTS pins of the DB9 port are continuously monitored by the screen blanking application.

When the vehicle is in motion, the switch closes the circuit, allowing data packets to be sent or received through the RTS and CTS pins. The computer detects that the circuit is closed and turns off the screen.

When the vehicle is not in motion, the switch opens the circuit, preventing data packets from being sent or received. The computer detects that the circuit is open and turns on the screen.