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The RS485 Pi is a communication board supporting the RS-485 serial protocol.
The RS-485 port is connected to the UART port on the Raspberry Pi using a SN65HVD72 interface. The SN65HVD72 IC converts the 3.3V UART signals to RS-485 voltages allowing communication with RS-485 compatible devices over a DB9 serial cable or twisted pair cable. The RS-485 port can be accessed through the DB9 port or the solder points on the PCB.
The RS485 Pi is supplied with the 40 pin GPIO connector and the DB9 connector unsoldered. A 120R terminator resistor is included in the kit. This will be required if the RS485 Pi is used as an end node within an RS485 network.
More information is available on the website of AB Electronics.