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Wireless Communication with IrDA Standard Protocol Slide 18
On a PC this will only occur after a PC program has “attached” to the IR port - such as HyperTerminal. On a PDA this occurs when the 1st byte (packet) of data is ready to be transferred. The Secondary Device will confirm that the channel is open for data. When the MCP215x or MCP2140 confirm that the channel is open for data, they will also drive the appropriate signal (CD or DSR) low to indicate that the link is now open, and Data may be transferred.
PTM Published on: 2011-10-28