| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple calling announcing device reliably transmitting calling information to a master set even when calling occurs simultaneously from slave sets with a pair of communication lines concerning the calling announcing device where only a calling place and a calling content are recognized but a response is not performed by the master set. SOLUTION: The device is organized with a transmission line by which the whole slave sets recognize outputting when one of the slave sets outputs a signal. The slave sets include a collision detecting part, having a function of variably setting a signal width at every slave set concerning a start signal to be transmitted from the slave set and of allowing the slave set, which detects the output of the signal by a certain slave set, to refrain from performing transmission for a period being not less than a time width where a certain slave set terminates one-time transmission. COPYRIGHT: (C)2006,JPO&NCIPI
|
