IBM RS/6000 44P manual IBM 7852-400 DIP Switch Settings, Xon/Xoff Modems, Switch Position Function

2.Copy the /usr/share/modems/modem_f.cfg file to a new file with a different name (for example modem_fx.cfg).

3.In the new file (modem_fx.cfg), change the line Send "ATE0T\r" to Send "ATcccE0T\r" where ccc is the added command as specified your modem manual, as follows:

Change the third line of each of the following stanzas:

vcondout

vcondin

vripo

4.Save the changes.

IBM 7852-400 DIP Switch Settings

If you are using a 7852-400 modem to enable service processor communications, the DIP (dual inline package) 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 package do not support these modems, so custom configuration files are necessary. Anchor Automation 2400E is an example of such a modem.

Iif you experience unexplainable performance problems that may be due to Xon/Xoff characters, it is recommended that you upgrade your modem..

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