Setup Guide: Using USRobotics Modems in Unix

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Setup Guide: Using USRobotics Modems in Unix This guide demonstrates configuration of USRobotics Sportster and Courier modems for use in a dialin application in a Unix-type environment:

Dip Switches
- DIP switches 3,7, and 8 down (The rest UP)
```
Switch 3 Down is display result codes
Switch 7 Down is Load factory defaults
Switch 8 Down is Smart Mode
```
- DIP switches 3 and 8 ON (The rest OFF)
```
Switch 3 On Display Result Codes
Switch 8 On Enable AT Command Set
```
the command sequence for the modem should be:
```
	at&b1&w

		&b1 -- fixed serial port rate
```
Follow the instructions in the Modem config FAQ for the particular Operating System.
Port should set for rts and cts flow control. In SCO Unix this is
```
	ditty rtspace ctspace -ixon -ixoff -ixany /dev/ttyA01
```
(this can be put in the userdef file).
Other Unix versions are similar. The correct syntax for this command in each Operating System is demonstrated in the appropriate Modem FAQ. Consult with tech support for further assistance if needed.
Once the port is working properly, then change the following DIP switch to save NVRAM settings:
- Sportster switch 7 should be flipped UP to use saved settings.
- Courier switch 10 should be flipped ON to use saved settings.

Notes:

Switch 5 Up/Off is Auto Answer on first ring (or higher if specified in NVRAM with ATS0=# -- the default is S0=1). Thus ATS0 does not need to be set for most applications.
To verify DTE port speed, use the command
```
ATI5
```
the BAUD setting in TEMPLATE Y0 will reflect the current port speed.
Altpin needs to be configured correctly. (On for use with 8 wire cable, off for use with 10 wire cable). The modem may initially work with altpin set incorrectly but can fail if the remote site disconnects abnormally.
Some 14.4+ Modems will not work reliably if set for speeds below 38400, set modems for this speed and they will rate adapt to match remote site and line limitations.

All information presented on these support pages is current as of the date posted. While we try our best to keep all information up-to-date, we can not guarantee its accuracy. For the latest information, please contact your Digi representative.
This procedure involves the use of third party equipment. It demonstrates a setup that has been tested and found to work. It is meant as a guide only and is not a guarantee that particular 3rd party equipment is suitable for use in a particular application or environment, or is 100% compatible with our products.

Revised 10/27/98: BT