GPS clock system standard picture clock system (clock system), in short, consists of a master clock and a group consisting of the sub-clock. Under normal system operation, it is generally by 422 \ 485 (or network) bus structure, the master clock clocks directly to each terminal (or computer network) sends standard time signal. So picture-clock system, all the dozens, hundreds or even thousands of table clock displays the time, and computer network system time to time signals are transmitted to the master clock reference. Master clock and slave clock Description: