User's Manual Part 2

1.1: Related Documents Chapter 2: Data Mode and AT Mode

Chapter 2

Data Mode and AT Mode

The Serial Port Adapter can be in two different modes AT mode and data mode

The Serial Port Adapter starts up in data mode and can be requested to move to

AT mode by sending an escape sequence. The default escape sequence consists of

three consecutive forward slash characters ‘/’. The escape sequence character can

be changed using the ATS2 command. Pressing the restore-button on the Serial

Port Adapter, when it is powered up, restores the default escape character.

The following criteria must be met for the Serial Port Adapter to interpret the se-

quence as a valid escape sequence:

• Before the escape sequence there must be silence for 1 second. This time can

be changed using the AT*AMET command.

• After the escape sequence there must be silence for 1 second. This time can be

changed using the AT*AMET command.

•

The entire escape sequence must be sent within 200 ms.

To move from AT mode to data mode, use the “AT*ADDM” command.

Transparent

data mode

AT mode

AT escape

sequence

AT*ADDM

Some serial port adapter models also support the ECI mode, which is not covered in this document.