The MARC™ MULTII-PORT™ module is based on a powerful microprocessor that allows Intelligent processing of messages — rather than just simply multiplexing them. All incoming messages received at the "Advantage Ports" are processed, as required, utilizing the selected protocol and presented to the "shared port" on a first come, first serve basis. If two or more messages arrive at the same time, they are serviced one at a time in a "round robin" process. Messages are not lost or garbled. Model 366-10P MULTII-PORT™ port multiplier increases a single serial port to two, three or four ports. The MULTII-PORT™ mounts on a standard DIN mounting rail and is offered in both AC and DC powered versions. This compact, low power module can enhance the functionality of a variety of serial communication devices.