This looks like a way to allow for addressing nodes on a CAN, RS485 or DMX network without needing to use either DIP switches or PCB changes.
Address
2 posts
The MCP23017 is a popular I2C 16bit IO module, it can be used to allow you to have more GPIOs available, There is also the MCP23018 available, which does fundamentally the same as the MCP23017, but with a few differences: On an I2C bus, each device has a unique address, […]