User Manual

RN41/42 Evaluation Kit User’s Guide
DS50002325A-page 32  2014 Microchip Technology Inc.
FIGURE 2-9: TERMINALS A AND B
2.10 SECURITY MODES
The Bluetooth module supports authentication. If the local or remote Bluetooth device
has authentication enabled, a pin code is required the first time a connection is
attempted. The pin code is a series of numbers or characters from 1 to 16 characters
in length. After the user enters the pin code, the Bluetooth devices compare these
codes. If a match is found, a link key is generated and stored. Usually, but not always,
the remote device stores the link key. For subsequent connections, the devices com-
pare link keys. If correct, the user must not re-enter the pin code. If the remote device
is a PC or PDA, the user generally is prompted to enter this pin code. To remove the
stored link key on the remote device, the user typically needs to “unpair” or remove the
device from the Bluetooth manager. User can change the pin code to remove the link
key on the Bluetooth module, forcing a new pin code exchange to occur upon subse-
quent connection attempts.
Note: Only one master can connect to the Bluetooth module at a time.