| 摘要 |
PURPOSE:To detect a status signal of an optional section to be controlled at a control section through a status signal line by providing a detection circuit for frequency signal waves f1-fN sent when a prescribed controlled section is selected in the control section. CONSTITUTION:An address information line 4, a control line 5 and a reply data line 6 are connected multiply with plural controlled sections (#1-#N) 2-3 from the control section 1 and one status signal line 17 connected to the control section 1 is connected in common to the controlled sections (#1-#N) 2-3. The controlled section #X having a predetermined address the same as that for address information sent from the control section 1 sends a rectangular wave FX as a status signal. The signal FX is detected by a frequency detecting means 11 of the control section 1 to detect the status signal from the controlled sections #1-#N.
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