The following configuration applies to commonly used US Robotics modems:
1. Dip Switches
Sportster modems should be set initially for:
DIP switches 3,7, and 8 down (The rest UP)
Switch3 Down is display result codes
Switch7 Down is Load factory defaults
Switch8 Down is Smart Mode
Courier modems should be set initially for:
DIP switches 3 and 8 ON (The rest OFF)
Switch3 On Display Result Codes
Switch8 On Enable AT Command Set
# dinc 19200 /dev/ttyxyz
The at&b1 setting configures a fixed serial port rate on the modem.
3. The port should set for RTS and CTS flow control. In Linux this is command is:
This command can be placed in /etc/init.d/dgrp_ditty to keep the configuration over reboots.
4. If using 8-wire RJ45 cabling (non-Digi cabling), the altpin setting will need to be applied to the Digi unit. Telnet to the Digi unit, login as root and issue the following command:
Switch 5 Up/Off is Auto Answer onfirst ring (or higher if specified in NVRAM with ATS0=# -- the default isS0=1). Thus ATS0 does not need to be set for most applications.
To verify DTE port speed on the modem, use the command:
Some 14.4+ Modems will not workreliably if set for speeds below 38400.