The RS485 extension board allows your OpenMV to communicate with other devices via the RS485 protocol. This board features automatic transmission and reception, requiring no read/write control, only TX and RX pins. It can be programmed directly using the pyb.UART class built into OpenMV.

The DB9 connector on the board uses Siemens' common pin distribution, allowing direct cable connection to Siemens PLCs. Use the ModBus slave program on OpenMV and the ModBus master program on the PLC.

The board includes a 24V to 5V regulator, which can power the OpenMV through the connector.

Tutorial

Implementing Communication between OpenMV and PLC with RS485 Extension Board