Connecting Devices To The Serial Port - Matrox 4Sight X Installation And Hardware Reference

Connecting devices to the serial port

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Connecting devices to the serial port
You can connect devices to the two serial ports using a 9-pin RS-232 or RS-485
serial port cable. Both serial ports conform to the RS-232 interface standard, but
the bottom serial port can also be configured for the RS-485 interface standard.
If you want to connect RS-485 serial devices to the bottom serial port, remember
to configure the bottom serial port to meet this standard. This is done by adjusting
the unit's internal dip switch. For more information on this switch, refer to the
Dip switch subsection in the Pinout descriptions of internal connectors and dip switch
section in Appendix B: Technical reference.
Note that the RS-485 standard cables are different from those meeting the RS-232
standard. This is because RS-485 requires differential signaling, and therefore its
electrical requirements are different. In addition, the function of the serial port
connectors' pins are different when operating under RS-485. For details on the
connector pinout of each interface, refer to Appendix B: Technical reference.
For more information on the two serial ports, refer to the Serial ports section, in
Chapter 5: Matrox 4Sight X hardware reference.