| 摘要 |
<p>A method of selecting a desired address in a plurality of input/output boards (10 to 12) connected to common buses (6) in an input/output interface unit (1) which is connected to a main control unit (6) through a serial data transmission system. A programmable address converter circuit (5) is provided which generates slot selection signals (s1 to s16) and an in-board address (BA) from an address for accessing the input/output boards which is output from a control circuit (2) in the input/output interface unit (1). One of the input/output boards (10 to 12) is selected by the slot selection signals (s1 to s16), and one of the addresses in the selected input/output board is selected by the in-board address (BA).</p> |
