User`s guide

The “ATV0” command can be used to select numeric codes if required. The results from the

text based commands can be numeric or verbose. A full list of the Result codes is provided

in the following table:

Numeric code

Verbose code

Meaning

0 OK Command line executed correctly

1 CONNECT ISDN connection established

2 RING Incoming ring signal detected

3 NO CARRIER X.25 service not available

4 ERROR Error in command line

6 NO DIALTONE ISDN service not available

7 BUSY B-channel(s) in use

8 NO ANSWER No response from remote

“S” Registers

“S” (Special) registers are registers in the unit that are used to store certain types of

configuration information. They are essentially a “legacy” feature included to provide

compatibility with software that was originally designed to interact with modems. A full list

of the registers is provided under the section heading “S registers”.

Digi Application Commands

The unit also supports numerous text-based “application” commands that are specific to

Digi International products and do not require the “AT” prefix. Some of these are generic

i.e. they are related to the general operation of the unit; others are application or protocol

specific.

Application commands may be entered via any of the serial ports but if you are using ASY 0

or ASY 1 with auto-speed detection enabled (which is not possible on ports 2, 3, etc.), you

must first lock the interface speed to the same as that of your terminal. To do this first

ensure that the unit is responding to AT commands correctly and then enter the command:

AT\LS

The speed will remain locked until the unit goes on-line and then off-line again, the power is

removed or the unit is reset. Once the port speed has been locked, “AT” commands will still

work but you may also use the application commands.

Remember that if you subsequently re-enable auto-speed detection on the port it will

disable the use of application commands until the “AT\LS” command has been re-entered or

the port speed has been set to a specific speed using “S31”. For example, to set the port

speed at 19,200bps enter the command:

ATS31=6

And then change your terminal settings to match.

Note:

Speed locking is not necessary when you use the text commands via a Telnet session.