Chapter 5 Installation
Pentium II /III ATX Motherboard User’s Manual
21
5.6 J2, J3: Serial Ports
The onboard serial ports of the , J2 and J3, are two DB-9
external connectors. The following table shows the pin-out assignments
of the these connectors.
Signal Name
Pin #
Pin #
Signal Name
DCD, Data carrier detect
1
6
DSR, Data set ready
RXD, Receive data
2
7
RTS, Request to send
TXD, Transmit data
3
8
CTS, Clear to send
DTR, Data terminal ready
4
9
RI, Ring indicator
GND, ground
5
10
Not Used
J4 (Parallel Port)
J2 (COM1 )
J3 (COM2)
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