Features
 Connects to the VM800P Plus module using an SPI slave interface
 SPI slave interface is converted to RS485 interface
 4 GPIO inputs and 4 GPIO outputs
 8 LEDs to indicate the input and output status
 3.3 V IO with 5 V tolerant buffers
 Screw connector to connect the RS485 signals, GPIO inputs and GPIO outputs
 IO interface to connect the RS485 signals, GPIO inputs and GPIO outputs
 Powered from the VM800P module