TransAct Technologies ITHACA 80PLUS - Manual (Page 43)

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