| 摘要 |
PURPOSE:To remarkably save the number of wirings and to reduce the man- power and time required for the work, by selecting a relay adaptor with one set of select-callout signal, and selecting a specific interphone slave set connected to the relay adaptor with the other set of the signal. CONSTITUTION:Different numbers are set to relay adaptors FA1 and FA2 with a number set switch (b) and also to interphones T1, T2 in living rooms with a number set switch (e). When a visitor selectively calls out a dial switch 11 of a common gate set 1, the callout number is coded at a converter 12, the code is separated into upper-order and lower-order digits, and the upper-order digit of the coded selection callout signal is converted into a serial data and the lower-order digit is into a serial date respectively at converters 14 and 15. A callout signal discriminating circuit (a) of the adaptors FA1 and FA2 discriminates the upper-order serial data and a callout signal discrimination circuit (d) of the interphones T1, T2 discriminates the lower-order serial data for the selection and callout. |
