| 摘要 |
PURPOSE:To attain reception and procession for initial setting order even if the controller is in a runaway state by decoding only the initial setting order in a circuit constituted of wired logic. CONSTITUTION:A data on a reception data signal line 7 is fetched to a shift register 2 in, e.g., 48-bit of an initial setting order detecting block 1 to check always the pattern of a reception data with the data of a fixed pattern generator 4 by a coincidence circuit 3. When the circuit 3 detects the initial setting order, an FF5 and an OR circuit 6 are used to form the order into an initial setting pulse having a prescribed width thereby conducting initial setting for a communication controller 9 through an initial setting signal line 8. Since the block 1 is constituted of the wired logic, even if the microprogram of the controller 9 runs away, the initial setting order transmitted from a central station to perform initial set to the controller 9, allowing to attain unattended maintenance of the device controlled remotely from the central station. |
