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86 Appendix B: Technical reference
RS-485 termination connector
The RS-485 termination connector is a standard 3-pin male connector that allows
you to change the termination of the top-most serial port when in RS-485 mode.
To set or determine if the top-most serial port (the RS232/485 COM port) is in
RS-232 or RS-485 mode, the BIOS must be set appropriately. For information,
refer to the BIOS appendix for the version of your Matrox 4Sight GPm.
Communication in RS-485 requires a 120 Ω termination on the differential
receiver pair of the RS-485 serial port connector. If your unit is to provide the
RS-485 termination for the signal, install the RS-485 termination connector on
pins 3-2.
Jumper
Installed on Pins 3-2
Installed on Pins 2-1
3
2
Description
Termination is instantiated by the unit on the RS-485 connection.
No termination is instantiated by the unit on the RS-485 connection.
1
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