Tyan Computer GX21 - Manual (Page 85)

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The available modes are as follows:
• ASKIR - The ASKIR setting allows infrared serial com-
munication at a maximum baud rate of 56K baud.
• HPSIR - The HPSIR setting allows infrared serial com-
munication at a maximum baud rate of 115K baud.
• FIR - The FIR (Fast IR) setting allows infrared serial
communication at a maximum baud rate of 4M baud.
• Normal - Sets serial port 2 to operate in normal mode.
This is the default setting.
RxD, TxD Active
This BIOS feature allows you to set the infra-red reception
(RxD) and transmission (TxD) polarity and is linked to the
second serial port. If you disable the second serial port, this
feature will not be available.
There are four options available, based on combinations of Hi
and Lo. You will need to consult your IR peripheral's docu-
mentation to determine the correct polarity. Choosing the
wrong polarity will prevent a proper IR connection from being
established with the IR peripheral. The choices are:
Hi, Hi / Hi, Lo / Lo, Hi / Lo, Lo
IR Transmission Delay
Enabling this option introduces a 4 character delay when SIR
is changed from TX mode to RX mode. The choices are:
Enabled / Disabled
UR2 Duplex Mode
This setting defines whether the IR port should operate in full
duplex or half duplex mode. In full duplex mode, the IR port
can receive and transmit at the same time. In half duplex
mode, the IR port can either receive or transmit but cannot do
both at the same time. Full duplex allows for better and faster
communication. The choices are:
Half / Full