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The corresponding relationship of cross cable
2 RS-232 connect cable made method
DVR-802x has standard DB9 RS-232 interface, like PC COM port.
Pin definition
“I” means DVR input and O means DVR output.
Pin index Name I/O Description
1 DCD I Carrier Detect
2 RXD I Receive Data
3 TXD O Transfer Data
4 DTR O Terminal Device Ready
5 GND Ground
6 -- -- --
7 RTS O Request to Send
8 CTS I Clear Data