116
2.8.5 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.
2.8.6 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.
2.8.7 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 2.93
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.
Summary of Contents for IT-800 Series
Page 173: ...173 Copyrights Tab This tab is for displaying the OS copyright information Figure 3 19 ...
Page 201: ...201 Date Tab This tab is for setting display format of date Figure 3 56 ...
Page 247: ...247 4 2 Games The terminal comes with two games Solitaire and Bubble Breaker Figure 4 2 ...
Page 255: ...255 4 5 Calculator The application can be used to operate nine digit calculator Figure 4 11 ...