AVerMedia Technologies AVERDIGI EB5416DVD - Manual (Page 18)

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1.5.4.3 RS485 Pin Definition
When connect PTZ camera through RS485 interface, please refer to the following pin
definition to connect the DVD and PTZ.
Pin # DVR PTZ
TX+ RS485 TX+ signal RS485 RX+ signal
TX- RS485 TX- signal RS485 RX- signal
RX+ RS485 RX+ signal RS485 TX+ signal
RX- RS485 RX- signal RS485 TX- signal