Atlona AT HD V216 - Manual (Page 6)

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2. The IR Extender Components Setup
RS-232 SERIAL INTERFACE CONNECT a PC or CONTROL SYSTEM
Pin RS-232 Definition
1 - Not used
2 TX Transmitter
3 RX Receiver
4 - Not Used
5 GND Ground
6 - Not used
7 - Not used
8 - Not used
9 - Not used
RS-232 SERIAL INTERFACE