Serial ports, Serial port connectors – Dell PowerEdge 350 User Manual
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B-2
User’s Guide
Serial Ports
The two integrated serial ports on the front and back panels of the system use 9-pin
D-subminiature connectors. These ports support devices such as external modems,
printers, plotters, and mice that require serial data transmission (the transmission of
data one bit at a time over one line).
Most software uses the term COM (for communications) plus a number to designate
a serial port (for example, COM1 or COM2). The default designations of your system's
integrated serial ports are COM1 and COM2.
Serial Port Connectors
If you reconfigure your hardware, you may need pin number and signal information for
the serial port connectors. Figure B-2 illustrates the pin numbers for the serial port
connectors and Table B-1 defines the pin assignments and interface signals for the
serial port connector.
Figure B-2. Pin Numbers for the Serial Port Connectors
Table B-1. Serial Port Pin Assignments
Pin
Signal
I/O
Definition
1
DCD
I
Data carrier detect
2
SIN
I
Serial input
3
SOUT
O
Serial output
4
DTR
O
Data terminal ready
5
GND
N/A
Signal ground
6
DSR
I
Data set ready
7
RTS
O
Request to send
8
CTS
I
Clear to send
9
RI
I
Ring indicator
Shell
N/A
N/A
Chassis ground