Technical Manual

Bluetooth Raw Serial Module Technical Specification

Document#: 6410-00195 A Revision 0.7

5. Hardware Interface Protocol

5.1. Initialization status

Hardware line Pin 4 (PIO_1) is used as a status indicator. This line is LOW (zero) indicates

that the module has not completed initialization. This line HIGH (one) indicates that the

module has completed its initialization and is ready to accept commands or Bluetooth

connections.

5.2. Connection enable

Hardware line Pin 9 (PIO_3), can be used to enable the module’s connectability and

discoverability.

If the module is configured in software to be a slave device, when this line is high the module

is not discoverable or connectable, regardless of the software settings. When this line is low

the module can be discoverable and connectable, depending on the software settings. If this

line is changed from low to high, any existing connections are dropped and the module will

not be discoverable or connectable.

If the module is configured in software to be a master device, when this line is high the

module will not attempt to connect to its ‘slave’ device (if it has one). When this line is low

the module will attempt to connect to its slave device.

5.3. Connection Status

Hardware line Pin 5 (PIO_4) is used by the local host to determine the modules current

connection state. When this pin is low, there is an active connection. When this pin is high,

there is no connection currently active. This pin can be used by the host to determine when

the module is in BT Link Active state or BT Link Inactive state.

5.4. RTS Flow Control Management

Hardware line Pin 12, RTS is used by the module to hold of data or command transmissions

from the host. When RTS is LOW, data or commands can be sent to the module, when RTS

is HIGH, data or commands should not be sent to the module.

When the module is starting up after power up, RTS may go inactive for a short time. It will

return to active when ready to receive control commands or data.