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● Serial connector
Pin number Signal name Direction Description
1 CD Input Carrier detect
2 RD Input Receive data
3 TD Output Transmission data
4 DTR Output Data terminal ready
5 GND – Ground
6 DSR Input Data set ready
7 RTS Output Request to send
8 CTS Input Clear to send
9 RI Input Ring indicate
● Mouse connector
Pin number Signal name Direction Description
1 DATA Input and output Data
2 NC – Not connected
3 GND – Ground
4 VCC – Power
5 CLK Input and output Clock
6 NC – Not connected
● Keyboard Connector
Pin number Signal name Direction Description
1 DATA Input and output Data
2 NC – Not connected
3 GND – Ground
4 VCC – Power
5 CLK Input and output Clock
6 NC – Not connected
CHAPTER 5 Bennett (53-60) 12/6/02, 10:31 AM59