Ibm 7852-400 Dip Switch Settings; Xon/Xoff Modems - IBM 9114-275 - IntelliStation POWER 275 Service Manual

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
1 Up
2 Up
3 Down
4 Down
5 Up
6 Up
7 Up
8 Down
9 Down
10 Up
11 *Up
12 *Down
13 Up
14 Up
15 Up
16 Up
* 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.
Function
Force DTR
Flow Control &E4
Result Codes Enabled
Modem Emulation Disabled
Auto Answer Enabled
Maximum Throughput Enabled
RTS Normal Functions
Enable Command Mode
Remote Digital Loopback Test Enabled
Dial-Up Line Enabled
AT Responses Enabled (Extended Responses Disabled)
Asynchronous Operation
28.8KB Line Speed
CD and DSR Normal Functions
2-Wire Leased Line Enabled
Appendix E. Modem Configurations
327