This library was tested with Appnostic's NOS8007 UART interface module with the NOS10001 baseboard on Arduino Uno and Minima R4 variants. As the library interfaces with the SC16IS75XX via I2C or SPI ...

Let iolinker hook up any of two UART devices on the fly; and switch to the next one afterwards. For example connect 24 Arduino UARTs to the iolinker adapter ontop of your first Arduino — that ...

So let’s say your using an Arduino in your project. You already have the hardware-based serial interface working with one portion of the project and need a second serial port for unrelated hardware.