User Manual

Chapter 2. Operational Modes

ASCII Interface has two operational modes, command mode and data mode. Com-

mand mode is default mode when there is no connections. It is possible to switch

between modes at any time when there are any connections. Data mode is not avail-

able if there is no connections (because there is not any data available).

Switching from data mode to command mode is issued with the following escape

sequence:

Same sequence or command SELECT may be used to return to data mode.

When ASCII Interface enters to command mode READY event is delivered (unless

masked away with SET CONTROL ECHO).

Command Mode

Command mode is default mode when ASCII Interface is powered. In command

mode commands can be entered to ASCII Interface to perform various activities.

Incoming data from remote devices is buffered when ASCII Interface is in command

mode.

Note: Because of embedded nature of ASCII Interface buffering capabilities are low and

only small amounts of data can be received to buffers.

Mode is changed from command mode to data mode when

• User switches mode either using escape sequence <1s>+++<1s> or using com-

mand SELECT.

• Connection is successfully created using command CALL (CONNECT event is used

to notify for successful link creation).

• Remote device has connected us (RING event is used to notify for incoming con-

nections).

Data mode

Data mode is default mode when there are any connections. In data mode all data

is sent totally transparently from UART over the Bluetooth RFCOMM link to other

device and vice versa.

Mode is changed from data mode to command mode when

• User switches mode using escape sequence <1s>+++<1s>.

• Link is terminated (closed by remote device or link loss) (NO CARRIER event is used

to notify for link termination).