Infrared Interface; Serial Port Addressing And Interrupts - NEC POWERMATE P - SERVICE MANUAL 1995 Service And Reference Manual

1-16 Technical Information
Table 1-7 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 can only be reset to
"Disabled". See Section 2, "Setup and Operation", for information on resetting the port
through Setup.
Serial interface specifications include:
n
Baud rate up to 19.2 KB per second
n
Word length - 5, 6, 7, or 8 bits
n
Stop bit - 1, 1.5, or 2 bits
n
Start bit - 1 bit
n
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 IR window (port) on the front of the system. The interface uses
infrared as the transmission medium instead of a traditional serial cable.
The IR port permits transfer of files to or from portable devices such as laptops and
personal digital assistant (PDA) products using the pre-installed Puma TranXit applications
software or other software supporting IrDA data transfer. The port supports data transfers
at 115 Kbps from a distance of 1 meter (3 feet 3 inches).
The IR port uses the system's COM2 serial port to transfer data. The port shares registers
and function logic with COM2.
Interrupt Level
IRQ04
IRQ03
IRQ04
IRQ03
Port
COM1
COM2*
COM3
COM4