NEC PA1705UL-W Installation Manual page 210

PC CONTROL Port (D-Sub 9 Pin)
9 8 7 6
5 4 3 2 1
Pin No.
1 Unused
2 RxD reception data
3 TxD transmission data
4 Unused
5 Grounding
6 Unused
7 RTS transmission request
8 CTS transmission allowed
9 Unused
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9. Appendix
Signal