| 摘要 |
Provided are a communication system that is capable of acquiring information having a relatively large data amount by a transmission unit while securing a communication speed of a transmission signal of transmission unit, and a transmission unit employed in communication system. Transmission unit transmits superimposition requesting data from a superimposition requesting unit to a second monitoring terminal in a transmission segment of transmission signal. Second monitoring terminal, upon receiving superimposition requesting data and with responding thereto, transmits, to transmission unit, monitoring data corresponding to a monitoring input from a sensor device with a superimposition signal superimposed on transmission signal as superimposition response data in a reply segment of transmission signal. Transmission unit, upon receiving superimposition response data composed of monitoring data with a superimposition communication unit, transmits control data to either a second control terminal or a first control terminal associated with this monitoring data in control table. |
