Casio IT-800 Series, Software Manual

Page: 112 / 325

112
2.7 IrDA
This chapter describes about detailed specifications of the IrDA.
2.7.1 Communication Speeds
The IrDA supports the following physical communication speeds.
Table 2.88
Via SIR FIR
IrDA protocol 9600, 19.2K, 38.4K, 57.6K, 115.2K bps 4M bps
RAW IR 9600, 19.2K, 38.4K, 57.6K, 115.2K bps -
Notes:
•
A speed of communication via IrDA protocol is automatically determined by negotiation with
the partner device.
•
The maximum communication speed supported only by both parties (the terminal and the
partner device) will be determined as communication speed.
•
Communication speed cannot be set in application.
2.7.2 COM Port
COM ports used with the IrDA are as follows.
Table 2.89
IrDA protocol COM3
RAW IR COM4
Notes:
•
When you create a communication program directly in application program to establish
connection with an IrDA device, it is recommended to use IrSock APIs instead of using one of
COM ports in the table above. For information about IrSock, refer to MSDN web site.
•
It is not recommended to establish communication via COM3. Because severe communication
control including obtaining acknowledgement whether the connection is established or not
cannot be possible. If using the COM3 is inevitable, well-managed system design and
thorough verification on the designed system including controlling communication at the
upper layer protocol are necessary.
•
The COM4 port is used to send and receive raw data directly via Infrared without using any
protocol. It is used to establish connection with a device which complies with the Infrared
physical layer specification but does not integrate the IrDA protocol in it. The use of this port
is not recommended because that raw data is exchanged via the Infrared, there may be cases
that stable communication is not carried out due to communication partner, communication
speed used at the upper layer, a match of communication protocols, etc. If use of the COM4
port is inevitable, well-managed system design and thorough verification on the designed
system including controlling communication at the upper layer protocol are necessary.