Woodward AtlasPC, Hardware Manual

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AtlasPC Digital Control, Vol. I Manual 85586V1
22 Woodward
On AtlasPC controls using the NT operating system, it is possible
under certain circumstances for the control to experience a failure to
boot when an HMI (Human Machine Interface) is connected and
actively accessing the COM1 port on the Pentium CPU.
This failure to boot is a rare anomaly embedded within the NT
operating system and will not occur when using the VxWorks®*
operating system.
If the AtlasPC control fails to boot with an HMI attached to the CPU
COM 1 port, the accepted solution is to remove the COM1 cable
before booting, and reconnect it following a successful boot.
The preferred alternative is for the GAP application program to use
the COM ports on the SmartCore board if at all possible.
*—VxWorks is a trademark of Wind River Systems, Inc.
Connector Signal Mnemonic
DB9M Shielded DB9 male
connector
1 DCD
2 RX
3 TX
4 DTR
5 Signal
Common
6 DSR
7 RTS
8 CTS
9 RI
Shield Chassis GND
Table 4-2. Pentium COM Port Pinout