To provide an arrayed object sequence detection system with which it is not necessary to transmit an identification signal from a body to a paper cassette nor it is necessary to provide an excess circuit in the paper cassette.SOLUTION: The present invention comprises a body and a plurality of arrayed objects. The body includes a downstream side interface including first to N'th output terminals for outputting a fist type of signal. Each of the arrayed objects includes an upstream side interface including a first to N'th input terminals each connectable respectively to the first to N'th output terminals included in the downstream side interface of the body nearest to the upstream side or an other arrayed object nearest to the upstream side, a downstream side interface including first to (N-1)th output terminals each for outputting the same type of signal as the second to N'th input terminals and the N'th output terminal for outputting a second type of signal, and means for detecting the sequence of the local arrayed objects on the basis of a combination of types of signals inputted from the first to N'th input terminals.SELECTED DRAWING: Figure 1
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