Optoma HD82 - Manual (Page 45)

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Appendices
RS232 Commands and Protocol
Function List
Pin no. Name I/O (From Projector Side)
1 NC __
2 RXD IN
3 TXD OUT
4 NC __
5 NC __
6 NC __
7 RS232 RTS
8 RS232 CTS
9 NC __
RS232 Pin Assignments
3 1 5
6 9