| 摘要 |
A BOARD 1A OF PAY PHONE 1 IS EQUIPPED WITH A CLASS INFORMATION OUTPUT PORTION 19 FOR OUTPUTTING A DIVIDED VOLTAGE LEVEL OF POWER-SUPPLY VOLTAGE VDD BASED ON RESISTANCES OF RESISTORS R1, R2, AS CLASS INFORMATION C AND WITH A VERSION INFORMATION OUTPUT PORTION 20 FOR OUTPUTTING A DIVIDED VOLTAGE LEVEL BASED ON RESISTANCES OF RESISTORS R3, R4, AS VERSION INFORMATION A OF THE BOARD 1A; A BOARD 1B IS EQUIPPED WITH A VERSION/MODEL INFORMATION OUTPUT PORTION 26 FOR OUTPUTTING A DIVIDED VOLTAGE LEVEL BASED ON RESISTANCES OF RESISTORS R5, R6, AS VERSION INFORMATION B OF THE BOARD 1B; AN A/D CONVERTER 21A CONVERTS THE MODEL INFORMATION C AND THE VERSION INFORMATION A, B FROM THE RESPECTIVE OUTPUT PORTIONS TO DIGITAL VALUES; AND A CPU 21 DETERMINES THE CLASS OF THE PHONE 1 AND THE VERSIONS OF THE RESPECTIVE BOARDS 1A, 1B FROM THESE DIGITAL VALUES. FIG 1.
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