The optical navigation device and communication system

A communication system comprises a transmission interface, a main control end and a controlled end. The transmission interface comprises a triggering/confirming passage used for transmitting triggering signals and confirming signals and a data transmission passage used for transmitting normal data or simplified data, the main control end sends the triggering signals through the triggering/confirming passage before data transmission, and after receiving the triggering signals, the controlled end transmits the normal data or the simplified data to the main control end through the data transmission passage.