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74 Chapter 5: Matrox 4Sight-II hardware reference
I/O interfaces
Matrox 4Sight-II integrates two serial ports, an audio interface, a parallel port,
and two USB ports. In addition, an auxiliary I/O connector, featuring support for
16 auxiliary LVTTL I/Os, is present.
Serial ports
Matrox 4Sight-II integrates two serial ports, the driver and the receiver of which
are always enabled. Each interface is controlled by a Universal Asynchronous
Receiver-Transmitter (UART) device, which converts serial data into parallel data
when receiving information. Conversely, when transmitting information, the
UART converts parallel data to serial data. The Matrox 4Sight-II motherboard
integrates 16550/16450-compatible UARTs, which feature independently
programmable baud rates (maximum baud rate = 115 200 bps) and internal
16-byte FIFO memory buffers.
Both serial ports conform to the RS-232 interface standard. RS-232 is capable of
sending and receiving information to and from local devices. Each port supports
a single device (point-to-point connections), and data communication is
single-ended.
The bottom serial port can also be configured to the RS-422/RS-485 interface
standard by changing the setting of the Interface item in the BIOS Setup program.
For more information on navigating within Setup, please refer to BIOS reference.
RS-422 and RS-485 can support multiple devices, at faster rates and farther
distances. In addition, data communication is differential.
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