MSI Fuzzy 945GME2 V1.0 - Manual (Page 46)

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MS-9642 Mainboard
Serial Port Setting
Onboard Serial Port 1 / 2 / 3 / 4 / 5
Select an address for Serial Port 1/2/3/4/5.
Serial Port 1 / 2 / 3 / 4 / 5 Use IRQ
Select a corresponding interrupt for Serial Port 1/2/3/4/5.
Serial Port 2 / 3 Mode
These settings specify the transmission mode of the Serial Port 2 & 3.
RS-422 defines a Balanced (differential) interface, specifying a single,
unidirectional driver with multiple receivers (up to 32). RS-422 will support
Point-to-Point, Multi-Drop circuits, but not Multi-Point.
RS-485 defines a Balanced (differential) interface, specifying bidirectional,
half-duplex data transmission. Up to 32 transmitters and 32 receivers may
be interconnected in any combination, including one driver and multiple
receivers (multi-drop), or one receiver and multiple drivers.