Technical Specifications
B–5
Serial Port Connectors
The serial port connectors consist of two 9-pin D-subminiature connectors. Table B–7 lists
their pin assignments.
The baud rates supported by the system's serial ports are 50, 75, 110, 134.5, 150, 300, 600,
1200, 1800, 2400, 4800, 7200, 9600, 19200, 38400, 57600, and 115,200. The serial ports
have signals for full MODEM control. Refer to your operating system information to
confirm which of the baud rates from the preceding list your operating system supports.
Table B–7: 9-Pin Serial Port Pinouts
DB9 Pin
Signal
Function
1
DCD
Data carrier detect
2
RXD
Receive data
3
TXD
Transmit data
4
DTR
Data terminal ready
5
GND
Ground
6
DSR
Data set ready
7
RTS
Request to send
8
CTS
Clear to send
9
RI
Ring indicator
Table B–8 shows the port mapping used by the OpenVMS operating system.
Table B–8: OpenVMS Port Mapping
Console Variable Value
Device
Graphics
Serial
Graphics head monitor
OPA0
N/A
COM1
OPA1
OPA0
COM2
TTA0
TTA0
