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A wired commodity vending system which comprises a plurality of slave stations each having an automatic vending machine including an outer door and an inner door and a controller for preparing and storing commodity sales data, and a master station for managing the slave stations to which the slave s

A wired commodity vending system which comprises a plurality of slave stations each having an automatic vending machine including an outer door and an inner door and a controller for preparing and storing commodity sales data, and a master station for managing the slave stations to which the slave stations are commonly connected through data transmission lines so that the items of commodity sales data in the respective vending machines are processed by the master station. The wired commodity vending system processes the commodity sales data by specifying the address of the slave station through the master station to provisionally transmit the commodity sales data stored in the slave station from the addressed slave station to the master station according to the address in response to the control data transmitted from the master station to the slave station, re-transmitting the control data from the master station following reception of the commodity sales data, re-transmitting the commodity sales data together with operating status data prepared by the controller to the master station in response to the control data from the addressed slave station which received the control data, and collating and confirming the commodity sales data and control and status data repetitively received at the master station. The first transmitted commodity sales data is one of the number of sold commodities, by type of commodity, and the number of commodities, by type, presently retained in the vending machine, while the second transmitted commodity sales data is both the number of sold commodities, by type, and the number of the commodities, by type, retained at present in the vending machine.

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A wired commodity vending system, including a plurality of slave stations, each having a vending machine including an outer door which can be opened so that a desired number of commodities can be taken from the vending machine, an inner door which can be opened for supplementing commodities taken fr

A wired commodity vending system, including a plurality of slave stations, each having a vending machine including an outer door which can be opened so that a desired number of commodities can be taken from the vending machine, an inner door which can be opened for supplementing commodities taken from the vending machine, a commodity rack for holding a plurality of different kinds of commodities and having a matrix of sensors for sensing a presence or absence of commodities held in said rack and control contacts for controlling said vending machine, and a controller for forming and storing commodity sales data, said slave stations being connected in common to a master station which manages said slave stations through data transmission lines, and respective commodity sales data for said vending machines being processed by said master station, said system comprising: (a) means for enabling said controller to operate responsive to closing of said outer door to form and store said commodity sales data; (b) means for transmitting address data from said master station to address a selected addressed slave station and for transmitting command data including control instruction data from said master station to said addressed slave station; (c) means for provisionally transmitting to said master station commodity sales data stored in an addressed slave station and for retransmitting to said master station control instruction data previously transmitted to said addressed slave station from said master station in response to command data including control instruction data transmitted from said master station to said addressed slave station, an address of said addressed slave station being designated by said master station; (d) means for transmitting said command data again from said master station to said addressed slave station subsequent to reception of said commodity sales data and said retransmitted control instruction data by said master station; (e) means for retransmitting commodity sales data and operating status data formed by said controller after said vending machine is operated in accordance with said control instruction data to said master station from said addressed slave station which has received said control instruction data; and (f) means provided in said master station for processing said commodity sales data after said master station confirms a predetermined correspondence between repeatedly received said control instruction data and said operating status data and between provisionally transmitted sales commodity data and retransmitted sales commodity data.