Appendix A At Commands And S-Registers - ADTRAN Express 3010 Manual

AT Commands and S-Registers
Appendix A
While a call is not established, the DTE port accepts AT commands.
During this time, the CD signal is inactive. When a call is established,
the port is used for data. This data mode is indicated by the CD signal
active. The Express can be configured and controlled with AT com-
mands from a serial port similarly to analog modems.
To exit data mode and enter command mode, the serial port must
transmit a proper escape sequence to the Express. A specified time de-
lay must occur between the last data character and the first escape se-
quence character. This is the guard time delay, and it can be changed
by writing a value to the S12 register. The default value for the guard
time is one second. For a valid escape sequence to occur, the DTE
must transmit the escape code character three times in succession with
delay between each character being less than the guard time. The de-
fault escape sequence is +++.
Once command mode is entered, AT commands can be transmitted to
the Express to configure most of the options, dial remote Expresss, or
initiate tests to check the Express and the network connections. All
command lines must begin with the AT character set in either capital
or lower case letters. To return an active call to the on-line state type
.
ATO
Commands may be separated with spaces for readability. The maxi-
mum length for a command line is 40 characters. Each command line
is executed by the Express upon receipt of a terminating character.
The default terminating character is a carriage return (ASCII 013), but
it can be changed by writing a different value to register S3. Before the
terminating character is transmitted, the command line can be edited
by using the backspace character (ASCII 008) to erase errors so the
proper commands can be entered.
61200239L1-20 Express 3010/3110 User Manual A-1