Information reading device which controls communication interrupt signal

Abstract

An information reading device for use in a system in which a plurality of slave devices, including the information reading device, are connected to a master unit through a common signal line. The information reading device controls an interrupt signal from the master unit and is provided with an irradiation portion for irradiating electromagnetic waves on a recording medium (i.e., bar code), a signal converting portion (i.e., CCD line sensor) for obtaining information signals representing the bar codes and storing the information signal, a driving portion, a code information output portion for forming code information, converting the code information and outputting a signal representing a result of the conversion of the code information to the master unit, a judgement portion for determining whether or not an interrupt signal is input from the master unit to the information reading device, an interrupt processing portion for performing an interrupt processing in response to an interrupt signal, a driving signal control potion for making the driving portion stop outputting the driving signal, and for making the driving portion resume outputting the driving signal and a code control portion for making the code information outputting portion convert the code information by removing data represented by the signal output from the signal converting portion when the interrupt processing portion performs the interrupt processing.