| 摘要 |
PURPOSE:To attain accurate and sure reception of a data bit by blocking the confusion between each transmission control signal and a data bit and mis- recognition of each transmission control signal during the reception of the data bit. CONSTITUTION:The order of reception is decided for a polling signal PR, a start signal ST and bytes X1, X2, Y1-Y3 in response to each flag when a master equipment KSU and telephone sets TEL1-TEL8 are in the reception side. Then each head bit and a synchronizing bit SY of the polling signal PR and the start signal ST are detected and the execution of an interruption routine is started. Bit intervals t1-t3 and bit numbers are detected based on each head bit and the polling signal PR, the start signal ST and synchronizing bit SY are discriminated based thereupon and then the signals PR, ST and synchronizing bits SY and data bits D0-D6 are discriminated surely. |
