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
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