IBM
7852-400
DIP
Switch
Settings
If
you
are
using
a
7852-400
modem
to
enable
service
processor
communications,
for
proper
operation,
the
dual
inline
package
(DIP)
switches
must
be
set
according
to
the
following
table:
Switch
Position
Function
1
Up
Force
DTR
2
Up
Flow
Control
&E4
3
Down
Result
Codes
Enabled
4
Down
Modem
Emulation
Disabled
5
Up
Auto
Answer
Enabled
6
Up
Maximum
Throughput
Enabled
7
Up
RTS
Normal
Functions
8
Down
Enable
Command
Mode
9
Down
Remote
Digital
Loopback
Test
Enabled
10
Up
Dial-Up
Line
Enabled
11
*Up
AT
Responses
Enabled
(Extended
Responses
Disabled)
12
*Down
Asynchronous
Operation
13
Up
28.8KB
Line
Speed
14
Up
15
Up
CD
and
DSR
Normal
Functions
16
Up
2-Wire
Leased
Line
Enabled
*
Only
switches
11
and
12
are
changed
from
the
factory
default
settings.
Xon/Xoff
Modems
Some
early
modems
assume
software
flow
control
(Xon/Xoff)
between
the
computer
and
the
modem.
Modems
with
this
design
send
extra
characters
during
and
after
the
transmitted
data.
The
service
processor
cannot
accept
these
extra
characters.
If
your
configuration
includes
such
a
modem,
your
functional
results
may
be
unpredictable.
The
sample
modem
configuration
files
included
in
this
appendix
do
not
support
these
modems,
so
custom
configuration
files
are
necessary.
Anchor
Automation
2400E
is
an
example
of
such
a
modem.
If
you
experience
unexplainable
performance
problems
that
may
be
due
to
Xon/Xoff
characters,
it
is
recommended
that
you
upgrade
your
modem.
Appendix
D.
Modem
Configurations
507
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