In summary, multiplexing several serial protocols over a single connector is non-trivial, and care must be taken to avoid the pitfalls noted in this presentation. These pitfalls are very difficult to avoid when using discrete RS-232 and RS-485 transceivers. MaxLinear's integrated SP338 and SP339 devices address each of these challenges, are easy to implement, and speed time to market for serial control systems. They provide designers with a reliable and convenient solution to reduce the number of external connectors, lowering parts count and reducing end product cost and size.