ZK S900 - RS232 Connection

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3b) Ethernet 10/100Base—T Crossover Cable
Most often applies to a switch or router，or directly connects
two Ethernet terminals (not through switch), fully supports
10Base-T and 100Base-TX.
Plug1 Pin Pin Plug 2
TX+ 1 <——> 3 RX+
TX- 2 <——> 6 RX-
RX+ 3 <——> 1 TX+
RX- 6 <——> 2 TX-
2.2.6 RS232 connection
PC Serial Port S900 terminal serial port
Pin2-Rxd Pin1-Txd
Pin3-Txd Pin2-Txd
Pin5-Gnd Pin3-Gnd