| 摘要 |
PURPOSE:To attain sure timing synchronization without the provision of an exclusive synchronizing signal line by detecting the head of a sent serial data at the reception side and forming a timing signal synchronously therewith after the data is transmitted within a prescribed period. CONSTITUTION:A serial data outputted from an NC device 1 is sent to a communication line 2 from a driver 15. A timing generator consists of a start bit detection section 34 connecting to a receiver 31 at the reception side, a mode setting section 35 setting a synchronizing signal detection mode based on an output of a parallel data from a converter 32, a flip-flop 36 and an AND gate 37. The detection section 34 outputs a detection pulse corresponding to the head of the serial data in one-frame. The flip-flop 36 sets the time range of detect the timing signal at the reception side by using a setting pulse. The AND gate 37 forms a timing signal synchronously with the detection pulse from the detection 34 corresponding to the frame set next to the frame including a synchronizing command. |
