Infrared Interface; Serial Port Addressing And Interrupts - NEC POWERMATE V Service Manual

I/O addresses and interrupt levels for the two channels are given Table 1-9. The interrupt
level is selectable via Setup to either IRQ3 or IRQ4. Software selectable base addresses are
3F8h, 2F8h, 3E8h, and 2E8h.
Table 1-9 Serial Port Addressing and Interrupts
Starting I/O Address
3F8h
2F8h
3E8h
2E8h
* Used for IrDA data transfer
Note that the COM2 port is factory set for IrDA data transfer and must be reset to
"Standard" for serial port transfers. See Section 2, Setup and Operation, for information on
resetting the port through Setup.
Serial interface specifications include:
T
Baud rate up to 19.2 KB per second
T
Word length - 5, 6, 7, or 8 bits
T
Stop bit - 1, 1.5, or 2 bits
T
Start bit - 1 bit
T
Parity bit - 1 bit (odd parity or even parity).
Serial interface signals are output through the system board's 9-pin, D-subconnector. The
connectors are located at the rear of the system unit. Pin locations for the serial interface
connector are shown in Appendix A.

Infrared Interface

The I/O controller incorporates an infrared interface that provides two-way wireless
communication through the IrDA window (port) on the front of the system. The interface
uses infrared as the transmission medium instead of a traditional serial cable.
NOTE: Any interrupts used for the built-in
serial ports are not available for ISA parallel
ports.
Interrupt Level
IRQ04
IRQ03
IRQ04
IRQ03
Technical Information
Port
COM1
COM2*
COM3
COM4
1-17