JPS6486640A - Gpib addition circuit - Google Patents

Abstract

PURPOSE:To initialize only an optional equipment by ORing a GPIB control signal inputted from a GPIB(General Purpose Interface Bus) bus and a pseudo control signal sent from a pseudo signal generating section at the input opera tion so as to input the result to the GPIB control section. CONSTITUTION:In bringing only a talker 3b in the initial state and in applying the power supply of, e.g., the talker 3b again from the nonpower supply, the talker 3b is initialized as follows. In applying the power supply of the talker 3b again, a pseudo signal generating section 15b generates a pseudo IFC(Inter Face Cliar) signal. The pseudo IFC signal is given to a GPIB control section 9b via an OR gate 21b and a bidirectional signal gate 19b to initialize the talker 3b. Thus, the power supply of an optional equipment is applied again in an optional timing without giving effect onto other equipment executing the data transfer and without deteriorating the throughput of the system operation such as the interruption of data transfer.