A-6
Sun Netra X4450 Server Service Manual • August 2008
A.3.2
Serial Port TTYA
The port labeled TTYA accepts a DB-9 connector. Use this port for general purpose
serial data transfers.
FIGURE A-4
shows the pin numbering of the serial port.
TABLE A-8
describes the pin signals.
FIGURE A-4
Serial Port (TTYA) Pin Numbering
A.4
Alarm Port
The alarm port on the alarm rear transition module uses a standard DB-15
connector. In a telecommunications environment, use this port to connect to the
central office alarming system.
FIGURE A-5
shows the pin numbering of the alarm
port.
TABLE A-9
describes the pin signals.
Note –
The alarm port relay contacts are rated for 100V 0.2A maximum.
TABLE A-8
Serial Port (TTYA) Connector Signals
Pin
Signal Description
Pin
Signal Description
1
Data Carrier Detect
6
Data Set Ready
2
Receive Data
7
Request to Send
3
Transmit Data
8
Clear to Send
4
Data Terminal Ready
9
Ring Indicate
5
Ground
