User`s guide

Using the Command Line Interface

Using a Web browser to modify text box or table values in the configuration pages is the

simplest way to configure the unit and this process is described in the next chapter.

However, if you do not have access to a Web browser, the unit can be configured using text

commands. These commands may be entered directly at one of the serial ports or via a

Telnet session. Remote configuration is also possible using Telnet or X.25.

To use the serial ports you will need a PC and some communications software such as

HyperTerminal ™ (supplied with Windows) or TeraTerm™. The same commands may also

be used to configure the unit remotely via Telnet, X.25 or V.120.

There are several types of text command:

AT Commands & S Registers

AT commands (pronounced “ay tee”) and Special registers (S registers) are supported in

order to maintain compatibility with modems when the unit is used as a modem

replacement.

Application Commands

Application commands are specific to Digi International products and are used to control

most features of the unit when not using the Web interface.

X.3 Commands

These are standard X.3 commands which are used only in X.25 PAD mode

TPAD Commands

These are used only in TPAD mode.

The “AT” Command Interface

Command Prefix

The “AT” command prefix is used for those commands that are common to modems. To

configure the unit using AT commands you must first connect it to a suitable asynchronous

terminal.

You will first need to set the interface speed/data format for your terminal to 115,200bps, 8

data bits, no parity and 1 stop bit (these settings can be changed later if necessary). When

your terminal is correctly configured, apply power and wait for the B2 indicator to stop

flashing.

Unless you have previously configured the unit to automatically connect to a remote system

on powerup, it will now be ready to respond to commands from an attached terminal and is

in “command mode”.

Now type “AT” (in upper or lower case), and press [Enter]. The unit should respond with the

message “OK”. This message is issued after successful completion of each command. If an

invalid command is entered, the unit will respond with the message “ERROR”.

If there is no response, check that the serial cable is properly connected and that your

terminal or PC communications software is correctly configured before trying again.