Communication system and electronic component mounting device

A communication system comprising:

• multiple electric devices that output actual data in which a start bit indicating data starting is set;
• a data extraction section that is connected to the multiple electric devices, and that extracts the actual data based on the start bit;
• multiple first buffers that are disposed corresponding to each of the multiple electric devices, and that accumulate the actual data extracted by the data extraction section corresponding to the multiple electric devices;
• a second buffer that sequentially selects one of the multiple first buffers, and that accumulates the actual data accumulated in the selected first buffer together with identification information of the electric device which outputted the actual data;
• and
• a transmitter-side multiplexing device that inputs the actual data and the identification information from the second buffer and transmits the actual data and the identification information as multiplexed data.