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Appendix B
Signal Descriptions
B-7
B.4
Serial Port A Connector
The serial port A connector is a DB-25 type connector located on the motherboard
back panel. The serial port A connector provides both synchronous and
asynchronous serial communications. The following figure illustrates the serial port
A connector configuration and the following table lists the pin assignments.
FIGURE B-4
Serial Port A Connector Pin Configuration
TABLE B-5
Serial Port A Connector Pin Assignments
Pin
Signal
Description
1
NC
Not connected
2
TXD_A
Transmit data A
3
RXD_A
Receive data A
4
RTS_A
Read to send A
5
CTS_A
Clear to send A
6
DSR_A
Data set ready A
7
Gnd
Signal ground
8
DCD_A
Data carrier detect A
9
NC
Not connected
10
NC
Not connected
11
NC
Not connected
12
NC
Not connected
13
NC
Not connected
14
NC
Not connected
13
1
14
25
A
Summary of Contents for Ultra 5
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Page 246: ...D 6 Sun Ultra 5 Service Manual February 2000...