The
test
routines
check
all
serial
port
controllers
at
speeds
from
300
to
115,200
bps
(up
to
460,800
bps
if
a
16550
UART
is
installed).
3.
Select
the
number
of
data
bits,
number
of
stop
bits,
and
parity
type
for
the
serial
port.
4.
Select
a
field
using
the
–
and
+
keys
and
set
the
parameters.
5.
Select
Continue,
and
press
Enter.
The
serial
port
tests
include
the
following:
v
Serial
Port
Hardware
Test
The
serial
port
hardware
test
diagnoses
hardware
attached
to
the
serial
port.
v
Internal
Loopback
Test
This
test
verifies
the
proper
functionality
of
the
transmitter
and
receiver
register
in
the
serial
port
using
the
internal
loopback
mechanism.
Attention:
Running
this
test
with
console
redirection
might
slow
down
the
server.
v
External
LoopBack
Test
This
test
verifies
the
proper
functionality
of
the
transmitter
and
receiver
register
in
the
serial
port.
This
test
requires
an
external
loopback
connector
to
be
physically
connected
to
the
serial
port.
Attention:
Running
this
test
with
console
redirection
might
slow
down
the
server.
v
FIFO
Test
This
test
verifies
that
the
first-in
first-out
(FIFO)
function
in
the
serial
port
is
functioning
properly.
This
test
is
enabled
only
for
UART
16550
and
above.
v
Baud
Rate
Test
This
test
verifies
the
accuracy
of
the
data
being
transferred
by
the
serial
port
at
different
baud
rates.
For
the
serial
port
test
error
codes,
see
“Serial
port
test
error
codes”
on
page
169.
LED
Test
Use
this
test
to
diagnose
all
LEDs
that
can
be
set
using
software
and
visible
after
the
server
is
assembled.
This
test
lights
all
LEDs
in
the
server
and
prompts
you
to
check
that
they
are
all
lit;
then,
it
turns
off
all
LEDs
and
prompts
you
to
check
that
they
have
been
turned
off.
RXE
Port
Test
Use
this
test
to
diagnose
problems
with
the
RXE
ports.
The
RXE
Port
Test
consists
of
the
following
sub-tests:
v
RIOG
(RXE)
Status
This
test
displays
the
status
of
the
RXE
ports
and
the
attached
RXE-100
units.
v
RIOG
Port
A
Test
This
test
verifies
the
quality
of
the
connection
from
the
RXE
Expansion
Port
(A)
connector
to
a
remote
I/O
enclosure.
v
RIOG
Port
B
Test
This
test
verifies
the
quality
of
the
connection
from
the
RXE
Expansion
Port
(B)
connector
to
a
remote
I/O
enclosure.
v
RXE-100
Side
A
Port
Test
This
test
verifies
the
quality
of
the
connection
from
the
RXE-100
Side
A
connector
to
the
RXE
Expansion
Port.
Chapter
3.
Diagnostics
61