| 摘要 |
PURPOSE:To shorten the transmission time of the control data even in a concatenating connection system by inhibiting the return of the control data indicating the release of a remote loop and then stopping the transmission of the control data after its detection is impossible at its own station. CONSTITUTION:A switch S1 is turned off when a remote loop is released and a control circuit 1 applied the signals of +5V to a selection circuit 3 and a release data generating circuit 4. Then the circuit 4 produces the control data to instruct the release of the remote loop. The control data sent from a device A is received by a device B and the device B release the remote loop. Thus, the remote loops are successively released and finally the remote loop formed by a device Z is released. Then the control data is decided any more by a release data detecting circuit 8 and a release data undetecting circuit 9 delivers the signal of +5. Thus the circuit 1 applies the signals of 0V to both circuits 3 and 4. Then the circuit 4 discontinuous generation of the control data and the circuit 3 selects data. |
