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Pin
Signal Name
1
Received line
signal detector
2
Serial receive
3
Serial transmit
4
Data terminal ready
5
Ground
6
Data set ready
7
Request to send
8
Clear to send
9
Ring indicator
Signal Function
Not used
Input signal to receive
data from the host system
Output signal sending
data to the host system
Output signal to float
control the host
Logic ground
Input signal to float
control printer
Output signal to float
control the host
Not used
Appendix
PC Host 9-pin Cross
Connect Pin #
3 TX
2 RX
6 DSR
5 GND
4 DTR
8 CTS
7 RTS
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