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2.5.7 Process after Communication Interruption

With Bluetooth communication, there is a chance that the communication link may be interrupted

due to radio wave conditions in air. An error occurred during the communication is detected by

carrying out WriteFile API function, ReadFile API function, etc.

In case where the communication is interrupted, carry out the normal Bluetooth interruption

process using the Bluetooth tool or in application and then retry to establish the same connection

for communication. If the normal Bluetooth interruption process is not made, unconformity in the

Bluetooth stack will occur so that the lower layer is disconnected whereas the upper layer is still

being connected causing the retry of establishing the connection is not possible.

2.5.8 Process During Suspend and Resume

When the terminal goes into suspend mode while Bluetooth is being used, the power to the

Bluetooth module integrated in the terminal will be automatically turned off. After that, when the

terminal resumes operation mode, the power to the Bluetooth module will be also turned on

automatically. Once the power is turned off, all the parameters related to Bluetooth

communication return to their initial states. These parameters must be set again in the Bluetooth

module by initializing the Bluetooth stack. If the Bluetooth tool or the Bluetooth Library is used, it

will automatically detect “suspend” and “resume” modes, and automatically initialize the

Bluetooth stack.

2.5.9 Setting SR Mode Parameter

When carrying out Bluetooth communication, the connection will be established by transmitting

radio waves by master Bluetooth equipment to slave Bluetooth equipment. Note that it may take

time sometime to make the establishment depending on a type of the partner Bluetooth equipment.

Here, by altering the SR mode parameter (used in Bluetooth connection), radio waves sent out

when the master Bluetooth equipment makes the establishment will change, and may reduce the

time required to establish the communication. The SR mode parameter can be set in the following

registry.

[HKEY_CURRENT_USER\SOFTWARE\RXBT\HCI]

Table 2.67

Key Setting Value Description

DEFAULT_PAGE_SCAN_REP_MODE dword: 0, 1, or 2 0:R0, 1:R1, 2:R2

Notes:

• Change the SR mode parameter prior to establishing Bluetooth connection.

• Even if the SR mode parameter is changed, the time required to establish connection with the

partner Bluetooth equipment may not be reduced.

Casio DT-X8 Series Software Manual

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