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Chapter 1: 7401-2xxx and 3xxx Product Overview 1-15
RS-232 DB-9 Male Connector Pinout
Pin Port A Port B
1 DCD DCD
2 RXD RXD
3 TXD TXD
4 DTR DTR
5 GND GND
6 DSR DSR
7 RTS RTS
8 CTS CTS
9 RI 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 interrupt is also generated
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 support optional features,
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.