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Appendix B Signal Descriptions B-3
B.1.2 Serial Port A and B (RS-423/RS-232) Connectors
The serial port A and B connectors are DB-25 type connectors located on the
motherboard back panel.
FIGURE B-2 illustrates the serial port A and serial port B
connector configuration and
TABLE B-2 lists the connector pin assignments.
FIGURE B-2 Serial Port A and B Connector Pin Configuration
TABLE B-2 Serial Port A and B Connector Pin Assignments
Pin Mnemonic Signal Name Description
1 Not connected None
2 TXD Transmit Data Used by the
data terminal
equipment (DTE) to transmit data
to the data circuit equipment (DCE).
Except when control data is being
sent, RTS, CTS, and DCD must be
ON for this line to be active.
3 RXD Receive Data Used by the DCE in response to
received data from the DTE.
4 RTS Ready To Send Used by the DTE to condition the
DCE for data transmission. The
transition to ON directs the DCE to
go into transmit mode. The
transition to OFF directs the DCE to
complete the transmission.
113
25 14
113
25 14
Serial port B
Serial port A