v
condin
v
ripo
4. Save the changes.
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.
Ring Detection
Most modems produce an interrupt request each time they detect a ring signal. Some
modems generate an interrupt only on the first ring signal that they receive. AT&T
DataPort 2001 is an example of such a modem.
Appendix D. Modem Configurations
317
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