LevelOne WBR-1100TX manual AT Commands, Required Settings, Finding the current Initial String

Appendix C

AT Commands

AT Commands

C

This Appendix details the "AT" commands used by modems and ISDN TAs. This information is provided to assist users who are using the serial port of LevelOne WBR-1100TX.

It is not relevant to Cable or DSL modems connected to the WAN (Ethernet) port.

Required Settings

For the LevelOne Wireless Broadband Router to use the Serial Port correctly, the modem or ISDN TA must be set as follows.

Setting	AT Command
Fixed baud rate setting	AT&B1
RTS/CTS flow control	AT&K3
DCD to track the presence of a carrier	AT&C1
DTR off to hang-up modem	AT&D2
DSR always on	AT&S0

If your Modem or ISDN TA uses the commands above, then the Initial String would be as follows:

AT&F&B1&K3&C1&D2&S0X4

Notes:

•The command "AT&F" is used to set the modem to the factory default settings, to ensure a consistent starting point.

•For some Mircocom and other modems, the "ATX4" command is not sufficient - a "W2" command (no "AT") must be used as well.

•ISDN TAs may not use these commands; please check your user guide for your ISDN TA.

Finding the current Initial String

If your modem or ISDN TA is already working correctly using the PC's serial port, but you don’t know what the initialization string is, you can use the following procedure to find out.

1.Select My Computer, then Dial-Up Networking.

2.Select the icon for your connection, then Properties.

3.Click the Configure button, then the Connection tab, as shown below.

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