4E Network
From SlugWiki
The purpose of the 4E Network is to interface all of our microcontroller-based projects to a central computer. We will use RS485 serial because it allows multiple devices and will be simple to implement on a PIC. Our implementation is similar to RS232, but allows up to 32 devices to be strung together on 2 pairs of cables. Each device will have a unique address, which will allow multiple devices on a single line.