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Part 4: Technical Reference
b) IrDA standard
To connect data transmission devices using infrared communication, the protocols
physical and transport layers have been standardized.
1) Physical Layer (IrDA-SIR)
2) Dataring Layer (IrLAP and IrLMP)
3) Transport Layer (IrTP)
The Printer does not have a IrTP in the transport layer.
In the physical layer standards (IrDA-SIR), the infrared signal are established.
The physical layer of the IrDA uses RZ signals in the base band format.
As a communication method it employs a start-stop synchronized half-duplex
communication and the transfer speeds are 9600/19200/38400/57600/115200
bps.
In start-stop synchronized communication, a start bit (0) and an end bit (1) are
added to the 8 bit data. After the 10 bit data has been transformed into RZ signals,
the signals are sent to the infrared transmitter.
The infrared receptor releases infrared pulses while the data is Low. When the data
is High, the pulses are not released.
The infrared transmitter transforms the received pulses into electric pulses.
4-14
BJC-50
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