This category contains I/O Modules that can be used with a PC via USB, Ethernet or RS232/422/485.

It also contains add-on boards and modules that can be used with microcontroller based boards to add additional functionality to a board, like interface converters (USB to UART, serial to Ethernet), Opto-isolated inputs, relay outputs, LCD and LED displays, pushbuttons, etc.

The I/O Modules are grouped into sub-categories by function, which you can select from the links below.

[RS232/422/485 to Ethernet] [SPI to Ethernet] [LCD Modules]