Serial Port Interface To The System; Serial Port Pin Assignments - HP Vectra Reference Manual

The address and interrupt of the serial port is defined in the
following chart.
Primary Secondary
Address 3F8H
2F8H
Interrupt
4
3
Serial Port Interface to the System
The serial port uses an RS-232C connector type D9-pin male. The
following table defines the pin assignments and signal
descriptions for this connector.
Table 11.1
Serial Port Pin Assignments
Pin I/O Signal Description
I
CF
When low, it indicates the device has
detected the data carrier.
2
I
BB
Rx data
3 0
BA
Tx data
4 0
CD
When active, it informs the device
that the card is available to
communicate.
S
AS
GND, ground
6
CC
When low, it indicates the device is
ready to establish the communications
link in order to transfer data.
7 0
CA
When active, it informs the device
,.
that the card is ready to transmit data.
8
CS
When low, it indicates the device is
available to receive data.
9
CE
When low, it indicates the device has
a telephone ringing signal.
Serial/Parallel Card 123