Page 60 - PDA Robotics Using Your Personal Digital Assistant to Control Your Robot

PDA 04 5/27/03 8:27 AM Page 36
PDA Robotics
Figure 4.4
Windows
communication
architecture.

Communication Link Speeds

Unlike typical NDIS media, the IR medium supports a large number of
different speeds for transmitting and receiving bits. Current defini-
tions for operating speed vary from 2400 bits per second (b/s) to 16
megabits per second (Mb/s). In the future, more speeds may be defined
by IrDA. Varying design goals at different speeds have led to different
coding methods for frames: SIR, MIR, FIR, and VFIR. The differences
in frame coding methods must be handled by the IrDA miniport driv-
er and be transparent to the protocol.

The currently defined IrDA speeds and their corresponding frame cod-
ing methods (Serial IrDA [SIR] link speeds, Medium IrDA [MIR] link
speeds, Fast IrDA [FIR] link speeds, and Very Fast IrDA [VFIR] link
speeds) are listed in Table 4.1.

36