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Wireless Communication with IrDA Standard Protocol Slide 8
IrDA has 3 specifications. Most Devices, including PDAs use the Asynchronous Serial IR, or SIR. SIR supports transmission speed of 115200 Baud. PCs and some printers implement Synchronous Fast IR, or FIR. FIR supports transmission speed of 4 Mbaud, but to ensure backwards compatible with SIR, it also starts negotiation at 9600 Baud, which is why PCs can talk to PDAs.
PTM Published on: 2011-10-28