CN2932490Y

CN2932490Y - Single-chip machine and industrial control machine communication interface and key multiplexing device

Info

Publication number: CN2932490Y
Application number: CN 200620026958
Authority: CN
Inventors: 徐卫生; 陈军; 王铁镰
Original assignee: Tianjin Baili Electronic Co Ltd
Current assignee: Tianjin Baili Electronic Co Ltd
Priority date: 2006-08-08
Filing date: 2006-08-08
Publication date: 2007-08-08
Anticipated expiration: 2016-08-08

Abstract

The utility model relates to a single chip machine and industrial controller communication interface and key reset device, comprising a single chip machine, a manual set circuit and computer composed of the corresponding operation key series-connected with a resistance and then parallel connected to a DC power supply, and MAX232 communication chip, wherein the RS232 communication port of the single chip machine is connected with the computer with the MAX232 communication port and the RX, TD and CK terminal of the single chip machine is respectively connected with the corresponding operation key of the manual set circuit. The communication method of the terminal multiplexing saves the limited terminal of the single chip machine, lowers cost, optimizes the program structure and increases the integral operation efficiency of the system.

Description

Single-chip microcomputer and industrial computer communication interface and button multiplexing device

Affiliated technical field

The utility model belongs to computing machine communication interface device, particularly relates to a kind of single-chip microcomputer and industrial computer communication interface and button multiplexing device.

Background technology

In the computer communication device that adopts for the technical matters of the manual setup parameter that solves existence and the given parameter of communication in the communication between the present known computing machine, be mostly two kinds of parameter given ways are realized with independent separately computer ports.For the not rich computing machine of this generic port of single-chip microcomputer, the not enough phenomenon of port will occur like this,, be unfavorable for the saving of production cost if at this moment adopt the more single-chip microcomputer of pin then can cause resource waste again.

Summary of the invention

The utility model provides a kind of one-chip machine port multiplexing for solving the technical matters that exists in the known technology, can be between manual setting and communication automatically be given single-chip microcomputer and the industrial computer communication interface and the button multiplexing device of switching flexibly.

The utility model for the technical scheme that solves the technical matters that exists in the known technology and take is: it includes single-chip microcomputer, by corresponding operating button each and parallel connection again after a resistance connect respectively, and being connected to manual initialization circuit and the computing machine of forming on the direct supply, it also includes the MAX232 communication chip; RS232 PORT COM on the described single-chip microcomputer is connected with described computing machine by described MAX232 communication chip; The RX of single-chip microcomputer, TD, the corresponding respectively corresponding operating button that is connected to manual initialization circuit of CK end.

The utility model can also adopt following technical measures:

Described computing machine is single-chip microcomputer, industrial control computer or PLC.

Advantage and the good effect that the utlity model has are: owing to adopt the communication modes of this multiplexed port, not only saved the limited port of single-chip microcomputer, reduced cost, and optimized program structure, improved the overall operation efficiency of system.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model;

Fig. 2 is a flow chart of the present utility model.

Embodiment

For further understanding summary of the invention of the present utility model, characteristics and effect, exemplifies now and following the present invention is used for embodiment on the circuit breaker short circuit overload test platform, and conjunction with figs. is described in detail as follows:

As shown in Figure 1, the RX of single-chip microcomputer, TD, corresponding respectively button SB2, SB3 and the SB1 that is connected to manual initialization circuit of CK end.Also respectively with in parallel again after resistance R 1, R2 and R3 connect, this parallel circuit is connected to 5 volts of direct supplys for button SB1, SB2 and SB3; The RX of single-chip microcomputer, TD end is connected to industrial computer PC by the MAX232 communication chip and goes up realization RS232 communication, and manually the switching of setup parameter and the given parameter dual mode of communication is called realization by program interrupt.

Its course of work is as shown in Figure 2: in the master routine operational process, single-chip microcomputer and industrial computer carry out the RS232 communication, and master routine constantly scans manual button state simultaneously; Master routine interrupts when the SB1 key is pressed for the first time, calls manual subroutine, and the communication between single-chip microcomputer and the PC at this moment will be blocked; The optional fixation numerical digit of SB2 key whenever clicks one of left side circulation; The SB3 key can be put number to selected position, whenever clicks to add one, to rules for doing division with a one-digit divisor on the abacus zero; Four all put after, click SB1 again and represent to confirm, promptly parameter is read in single-chip microcomputer, but still be manual operation state this moment, need insert a preset parameter (as 9999) again and then press SB1 and will withdraw from and interrupt to continue carry out master routine, system switches to auto state.

Claims

1. a single-chip microcomputer and industrial computer communication interface and button multiplexing device, it includes single-chip microcomputer, is distinguished respectively and parallel connection again after a resistance is connected by the corresponding operating button, and be connected to manual initialization circuit and the computing machine of forming on the direct supply, it is characterized in that: further comprising has the MAX232 communication chip; RS232 PORT COM on the described single-chip microcomputer is connected with described computing machine by described MAX232 communication chip; The RX of single-chip microcomputer, TD, the corresponding respectively corresponding operating button that is connected to manual initialization circuit of CK end.

2. single-chip microcomputer according to claim 1 and industrial computer communication interface and button multiplexing device is characterized in that described computing machine is single-chip microcomputer, industrial control computer or PLC.