414 Ultra Enterprise 450 Server Owner’s Guide • July 1997
Reference for the Serial Port A and B
Connectors
Serial Port Connector Diagram
The serial port conforms to RS-423/RS-232 specifications.
Serial Port Signals
Signal names ending in “A” indicate that the signal is associated with the
high-speed synchronous/asynchronous port provided by a standard DB25 serial
cable or the connector labeled “A” on the optional DB25 splitter cable. Signal names
ending in “B” indicate that the signal is associated with the high-speed
asynchronous port provided by the connector labeled B on the optional DB25 splitter
cable.
Pin Number Function I/O Signal Description
1 none none N.C.
1
2 TXD_A O Transmit Data
3 RXD_A I Receive Data
4 RTS_A O Ready To Send
5 CTS_A I Clear To Send
6 DSR_A I Data Set Ready
7 GND Signal Ground
8 DCD_A I Data Carrier Detect
9 none none N.C.
10 none none N.C
11 DTR_B O Data Terminal Ready
113
25 14
A/B
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