| 摘要 |
PURPOSE:To prevent drop-out of data by taking in data while covering data, which fails to be taken in, with an angular taking-in operation even if continuously inputted pulse input data fails to be taken in by an error or the like on a transmission line. CONSTITUTION:A taking-in command from a computer is transmitted to a remote station and is read by a station control circuit 14, and data of a pulse counter 17 is taken into a transmitting circuit 15. Through the station control circuit 14 issues a transmission command to the transmitting circuit 15, the pulse counter 17 is not cleared but continues counting in accordance with a signal PIN from a process. The signal inputted to the transmitting circuit 15 is converted to a serial signal and is transmitted through a transmission line 3 and received by a receiving circuit 13 in the computer side and is compared with contents of a pulse count register 22 in a comparator 23 by the control of the station control circuit 14 and an input/output control circuit 18, and only the difference is taken into a memory 21 of the computer. In this case, received data is stored in the register 22 after data is taken into the memory 21. |
