Chapter 1: 7401-2xxx and 3xxx Product Overview 1-15
RS-232 DB-9 Male Connector Pinout
Pin Port A Port B
1DCD DCD
2RXD RXD
3TXD TXD
4DTR DTR
5GND GND
6DSR DSR
7RTS RTS
8CTS CTS
9RI or +12*
VDC
RI
* If Port 1 or 3 are powered, pin 9 will be +12 V.
Hardware Monitor
The hardware monitor generates an interrupt to the system whenever
any of the internal voltages used by the system processor goes above or
below the acceptable operating range. An interru p t is als o gen e rat e d
when the temperature of the Processor exceeds safe levels. Software
can use this indication to slow or stop the system and/or force a reset.
PCI Expansion Header
A single expansion header is provided to supp o rt op tio nal fea t u r es,
such as the PCMCIA for Wireless LAN Board. This board supports two
Type 2 or one Type 3 PCMCIA type cards.
IDE Header
A standard IDE header is provided to support the 2.5-inch hard disk
drive and integrated CD-ROM. This header al supports the optional
256 MB IDE compact flash available in place of the hard disk.