POS DEVICE

PROBLEM TO BE SOLVED: To simplify an identification circuit in a POS device by using the same connector provided with a terminal and a lead wire to be electrically connected to only one of an ID card reader(IDCR) and an ID card reader-writer (IDCR/W). SOLUTION: When the IDCR 2 is connected to this POS device 1 and a power source is turned ON, a voltage 5V supplied through a supply voltage line 6 is returned through the connection presence/absence confirmation signal line 8 of the IDCR 2 or the IDCR/W 3 to the POS device 1 as it is. Further, in the IDCR 2, the voltage 0V supplied through a ground line 7 is returned through an IDCR identification signal line 9 to the POS device 1 as it is. When the IDCR/W 3 is connected to the POS device 1 and the power source is turned ON, the supplied voltage 5V is returned as it is similarly to the ICDR 2. Further, in the IDCR/W 3, the voltage 0V supplied through the ground line 7 is returned through an IDCR/W identification signal line 10 to the POS device 1 as it is.