A bus circuit in automatic sorting equipment for postal letters

Abstract

The invention relates to a bus circuit of a postal letter automatic sorting device, and belongs to the field of post logistics. The bus circuit of the postal letter automatic sorting device comprises a control host computer and a plurality of function modules connected with the control host computer, the function modules are respectively arranged on everywhere of a postal letter automatic sorting device, and the bus circuit of the postal letter automatic sorting device further comprises a module circuit board processing circuit. The bus circuit of the postal letter automatic sorting device is characterized in that the control host computer and the first function module, the first function module and the second function module and the follow-up adjacent function modules are all connected through buses, and a bus signal interface circuit is added to each function module. Complete electric isolation is achieved among each module circuit and the control host computer, the interference to a public reference electric potential is avoided, antijamming capability is strong, the protection of the interface circuit enables the withstand voltage of the buses of the module circuits to reach more than a thousand volts, a plurality of other module circuits can not be damaged, and dismounting wire and installing wire on-site are convenient.

Description

technical field [0001] The invention relates to a bus circuit, in particular to a bus circuit in automatic postal letter sorting equipment. Background technique [0002] The letter sorting machine, registered letter sorting machine and other large and medium-sized postal letter automatic sorting equipment developed and produced by Shanghai Postal Science Research Institute can realize the automatic sorting of postal letters. The control system of the sorting equipment includes an industrial computer as the host of the control system. The sorter is divided into several modules according to the function in the length direction. Each module is controlled by a module circuit, and each module circuit is accessed and controlled by the host. The communication mode between the module circuit and the host computer is a full-duplex parallel differential bus mode. [0003] This full-duplex parallel differential bus is composed of bus input signals and bus output signals. The bus input...

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a bus circuit in the postal letter automatic sorting equipment, which solves the defects of poor anti-interference ability of the current bus, error-prone installation, and the weakening of the driving ability that affects the operation of the equipment

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