FIELD: car control equipment. SUBSTANCE: external programming unit is used for programming of nonvolatile memory unit of control instrument. Said external programming unit is connected to control instruments by means of serial communication line. It transmits data required for programming to control instrument. In addition external programming unit sends unlock signal for input of program into nonvolatile memory unit. Control instrument has assemblies which provides recognition of unlock signal when external programming unit is connected to control instrument by means of serial communication line. EFFECT: increased reliability. 14 cl, 3 dwg
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