OPTI-UPS 280ES User Manual page 36

32 280ES / 420ES / 650ES / 1000ES / 1400ES
The serial port of the
computer has not been
configured properly.
The I/O card is defective
Check to see that the serial
port is enabled in the
CMOS settings.
check for IRQ conflicts and
make sure the settings
match those of OPTI-
SAFE™+.
Replace I/O card.
Also