Casio DT-900 - Manual (Page 27)

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DT-900 - DT-900 Data Communication
Application software and input data can be transferred between two DT-900 units using the
infrared ports on the bottom of the units.
Position the two DT-900 units so they will not accidently move during data communication.
The orientation of the two units depends on the type of
communication you plan to perform.
• Conformed IrDA Version 1.2:
0 (contact) to 20 centimeters or less enables
communication
Data Communication