Intel AIMB-253 Serial Port Setting, Onboard Serial Port 1 / 2 / 3 / 4, Serial Port 2 / 3 Mode

Serial Port Setting

Figure 3.8: 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 sup- port Point-to-Point,

Multi-Drop circuits, but not Multi-Point.

RS-485 defines a Balanced (differential) interface, specifying bidirec- tional, half-duplex data transmission. Up to 32 transmitters and 32 receiv- ers may be interconnected in any combination, including one driver and multiple receivers (multi- drop), or one receiver and multiple drivers.

43 Chapter 3 BIOS Setup