Acer Power F5 Aspire T650/E500 and Power F5 Service Guide - Page 23
Signal Name, Definition, Ring Indicator
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COM2: Onboard serial port header(optional) Pin 7 8 9 10 Signal Name NRTSB NCTSB NRIB KEY Definition Request to send Clear Ring Indicator Key CD_IN: Analog audio input header Pin 1 2 3 4 Signal Name CD in_L GND GND CD in_R Definition CD In left channel Ground Ground CD In right channel IR1: Infrared port Pin 1 2 3 4 5 6 Signal Name NC Key +5V GND IRTX IRRX Definition Not connected No pin IR Power Ground IrDA serial output IrDA serial input 16 Chapter 1