| 摘要 |
PURPOSE:To process many kinds of commands by applying signal transmission reception between an interface and a programmable controller through input and output data lines and sending the end of data output preparation through a data output request line. CONSTITUTION:An interface 41 of an interrogator 11 has 8 input data lines 21, 8 output data lines 22, an input data synchronizing line 23, an output data synchronizing line 24, and a data output request line 25 in total 19 communication lines. A required signal is fed in time division through the input data line 21 and a required signal is sent in time division through the output data line 22, the signal is fetched by using a synchronizing signal on the input data synchronizing line 23 or the output data synchronizing line 24 and the end of data output preparation is sent through a data output request line 25 or a busy line. Since the input data line 21 acts like a command line in this way, many kinds of commands are processed. |
