S4A WIEGAND-Ethernet, Manual

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7. The network port communicates directly with the TTL
permanent serial port
1. Connect a TTL communication connector to the white 4P plug. If the connector provides 5V
power, then do not provide power at 3 again. Otherwise, 12V/DC needs to be provided at 3 places
to facilitate the power supply of the equipment.
This TTL adapter cable needs to be provided by the user, that is, the TTL to RS232 adapter cable,
which is usually a USB interface, and a virtual serial port is created on the computer. The direction
indicated by the arrow in the figure is the direction of data transmission
(the opposite of the Wiegand conversion TTL output described below).
2. After you are ready, you can communicate via serial and network ports.
3. Note that the jumper in place 1 should be removed.
4. The figure below is the data of the network interface directly communicating with the UART
serial port
5V
2
3
GND
1