IBM 7852-400 DIP Switch Settings
If you are using a
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 | |
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 |
* 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 F. Modem Configurations 187