CN202816188U

CN202816188U - Pressure analog dial indicator having serial communication interface

Info

Publication number: CN202816188U
Application number: CN 201220439092
Authority: CN
Inventors: 张涛; 肖凡; 马瑞萍; 周超; 申军; 王学进; 马长李
Original assignee: NAVAL VESSELS COMBAT SYSTEM DEMONSTRATION INSTITUTE OF CHINESE PEOPLE'S LIBERATION ARMY NAVY EQUIPMENT INSTITUTE
Current assignee: NAVAL VESSELS COMBAT SYSTEM DEMONSTRATION INSTITUTE OF CHINESE PEOPLE'S LIBERATION ARMY NAVY EQUIPMENT INSTITUTE
Priority date: 2012-08-30
Filing date: 2012-08-30
Publication date: 2013-03-20
Anticipated expiration: 2022-08-30

Abstract

The utility model relates to a pressure analog dial indicator, and specifically relates to a pressure analog dial indicator having a serial communication interface, belonging to the electronic communication field. According to the utility model, the circuit of a pointer-type voltmeter is improved such that a single-chip microcomputer AT89S53 receives a pressure display instruction transmitted by a computer trough a serial interface, the pressure display instruction is converted into a digital voltage value inside the single-chip microcomputer AT89S53, the digital voltage value is converted into an analog voltage signal, and the analog voltage signal is input into the pointer-type voltmeter, so that the purpose of controlling the pointer of the pointer-type voltmeter to indicate a corresponding scale mark is achieved, and the pressure analog dial indicator is obtained by replacing the pressure dial of the pointer-type voltmeter. The pressure analog dial indicator is applicable but not limited to the pressure indicator analog training.

Description

A kind of pressure simulation indicating gauge with serial communication interface

Technical field

The utility model relates to a kind of pressure simulation indicating gauge, and particularly a kind of pressure simulation indicating gauge with serial communication interface belongs to the communications electronics field.

Background technology

In the training that relates to the pressure instruction simulation, because it focuses on the training on operation process of the judgement of operating process and important information, need to replace real system to reduce loss in the training on operation process with simulation device.The instruction simulation equipment of existing pressure adopts following scheme mostly: voltage (perhaps electric current) table is reequiped, and the scale dial plate adopts the pressure indicator dish.During use, computer control industry control integrated circuit board or module produce voltage (perhaps electric current) signal, and this signal backpointer indication of voltage (perhaps electric current) table perception is in a certain position of pressure indicator dish.

The shortcoming of above-mentioned pressure simulation indicating gauge is only the dial plate of voltage (perhaps electric current) table to be replaced, owing to produce voltage (perhaps electric current) signal with industry control integrated circuit board or module, and industrial control board cartoon Chang Chengben is higher, simultaneously above-mentioned pressure simulation indicating gauge can't directly carry out serial communication with computing machine, so computing machine can't be convenient and dial plate accurate controlled pressure indicating gauge is indicated.

Summary of the invention

For improving the above-mentioned deficiency of prior art, the invention provides a kind of pressure simulation indicating gauge with communication interface, computing machine sends order by serial line interface, and controlled pressure simulation indicator gage finger is indicated in the relevant position, thereby finishes the simulation indication of pressure.

For achieving the above object, technical scheme of the present invention is:

A kind of pressure simulation indicating gauge with serial communication interface comprises needle dc voltmeter, serial communication circuit plate and interface panel;

The serial communication circuit plate comprises single chip computer AT 89S53, level transferring chip MAX232, D/A TLC5620, the first external interface and the second external interface;

The first external interface has two ports, is respectively port A1 and port A2;

The second external interface has three ports, is respectively port B1, port B2, port B3;

The low level end of single chip computer AT 89S53

A1 links to each other with port, reset terminal RST and low level end Connect through electric capacity, reset terminal RST links to each other with port A2 through resistance, is connected with crystal oscillating circuit between the output terminal XTAL1 of sheet internal oscillator inverting amplifier and the XTAL2, and XTAL1 all links to each other with port A2 through electric capacity with XTAL2;

Level transferring chip MAX232 is used for realizing the conversion between the interface circuit Transistor-Transistor Logic level of the EIA level of computer serial interface standard RS-232C and single-chip microcomputer, level transferring chip MAX232 external capacitor end C1+ is connected electric capacity with external capacitor end C1-and connects, external capacitor end C2+ is connected electric capacity with external capacitor end C2-and connects, external voltage end V+ is connected electric capacity with supply voltage input end VCC and connects, external voltage end V-connects through electric capacity with power supply ground end GND, supply voltage input end VCC connectivity port A1, power supply ground end GND ground connection, Transistor-Transistor Logic level transmitted signal input end T1IN is connected with the serial output terminal mouth TXD of single chip computer AT 89S53, Transistor-Transistor Logic level receives signal output part R1OUT and is connected with the serial input port RXD of single chip computer AT 89S53, EIA level transmitted signal input end R1IN links to each other with port B1, and the EIA level receives signal output part T1OUT and links to each other with port B2;

Serial data latch signal end load among the D/A TLC5620 links to each other with the I/O mouth P1.0 of single chip computer AT 89S53, serial data input clock end CLK links to each other with the I/O mouth P1.1 of single chip computer AT 89S53, serial data input end DATA links to each other with the I/O mouth P1.2 of single chip computer AT 89S53, reference voltage input terminal REFA connects+the 5V power supply;

Interface panel comprises power interface and 9 core serial ports RS232C, wherein the power interface negative pole links to each other with port A2, the power interface positive pole links to each other with port A1, No. 2 tube cores of 9 core serial ports RS232C link to each other with port B1, No. 3 tube cores link to each other with port B2, No. 5 tube cores link to each other port B3 ground connection with port B3;

The dial plate range of needle dc voltmeter adopts the pressure range that needs simulation, and the positive terminal of pointer pressure links to each other negative terminal ground connection with analog signal output DACA among the D/A TLC5620;

The serial communication circuit plate is anchored on the postnotum inboard of needle dc voltmeter, and interface panel is fixed in the postnotum outside of needle dc voltmeter.

Beneficial effect of the present invention is:

Compare with the pressure simulation indicating gauge of the voltage of only changing the scale dial plate (perhaps electric current) table repacking, need not extra driving circuit, save cost, simultaneous computer is more convenient and accurate to the control of the demonstration of dial plate.

Description of drawings

Fig. 1 is a kind of pressure simulation indicating gauge circuit diagram with serial communication interface;

Fig. 2 is interface panel;

Fig. 3 is the pressure indication dial disc.

Embodiment

The utility model improves by needle dc voltmeter being carried out circuit, uses single chip computer AT 89S53 directly to communicate by serial line interface and computing machine, and control TLC5620 chip produces corresponding voltage signal and controls the pointer of voltage table and indicate corresponding scale.

Below in conjunction with the accompanying drawing specific embodiment that develops simultaneously the utility model is described further:

At first, the pressure range of simulation is made the pressure indication dial disc of corresponding scale as required, and the scale interval of pressure indication dial disc should be consistent with the voltage dial plate of 5V D.C. voltmeter, and the working pressure indication dial disc substitutes the voltage dial plate of 5V D.C. voltmeter;

Then, according to Fig. 1, make serial communication circuit figure:

With reference to single chip computer AT 89S53 operation instruction, the low level end of single chip computer AT 89S53 2 ports of external interface CN1 link to each other, reset terminal RST and low level end

Between be connected with electric capacity, reset terminal RST links to each other with 2 ports of external interface CN1 through resistance; 2 ports of external interface CN1 link to each other with the power interface negative pole, and 1 port links to each other with power interface is anodal;

Because the computer serial interface standard is the RS-232C standard, and the interface circuit of single-chip microcomputer is the TTL signal, for guaranteeing that single-chip microcomputer and computing machine carry out proper communication, select level transferring chip MAX232 to realize conversion between EIA level and the Transistor-Transistor Logic level, operation instruction with reference to level transferring chip MAX232, set the external capacitor end C1+ of level transferring chip MAX232, C1-, C2+, C2-, external voltage end V+, V-, supply voltage input end VCC, the connection of end GND in power supply ground between each: the C1+ pin of level transferring chip MAX232 is connected electric capacity with the C1-pin and connects, the C2+ pin is connected electric capacity with the C2-pin and connects, the V+ pin is connected electric capacity with the VCC pin and connects, the V-pin is connected electric capacity with the GND pin and connects, VCC connectivity port A1, GND ground connection; Transistor-Transistor Logic level transmitted signal input end T1IN is connected with the serial output terminal mouth TXD of single chip computer AT 89S53, the serial input port RXD that Transistor-Transistor Logic level receives signal output part R1OUT single chip computer AT 89S53 connects, EIA level transmitted signal input end R1IN links to each other with No. 1 port of the second external interface CN2, and the EIA level receives signal output part T1OUT and links to each other with No. 2 ports of external interface CN2; No. 1 port of the second external interface CN2 links to each other with No. 2 tube cores of 9 core RS-232C, No. 2 ports link to each other with No. 3 tube cores of 9 core RS-232C, No. 3 ports link to each other No. 3 port ground connection of the second external interface CN2 with No. 5 tube cores of 9 core RS-232C;

Serial data latch signal end load among the D/A TLC5620 links to each other with the I/O mouth P1.0 of single chip computer AT 89S53, serial data input clock end CLK links to each other with the I/O mouth P1.1 of single chip computer AT 89S53, serial data input end DATA links to each other, exports renewal control signal end LDAC with the I/O mouth P1.2 of single chip computer AT 89S53 and links to each other with 1 port of external interface CN1, other establishes+and the 5V power supply connects for giving reference voltage input terminal REFA, and analog signal output DACA links to each other with the positive terminal of voltage table; The negative terminal ground connection of voltage table.

Secondly, it is inboard that the circuit board that above-mentioned connection is finished is anchored on the postnotum of needle dc voltmeter, outer terminal both positive and negative polarity and 9 core RS-232C are made on the same panel, be interface panel, as shown in Figure 2, will be fixed in the interface panel of outer terminal both positive and negative polarity and 9 core RS-232C the postnotum outside of needle dc voltmeter.

Based on said process, the pressure simulation indicating gauge is finished.When using this pressure simulation indicating gauge to indicate specific force value, use port RS-232C to link to each other with the serial ports RS-232C of external computing machine, the both positive and negative polarity of the both positive and negative polarity of outer terminal connects respectively external+5V power supply; The serial data signal that the computing machine transmission is 11 gets final product the swing of control table index, and 11 bit data forms are as follows: 00+CODE+0, CODE are 8 bit data codes, CODE=256x ÷ L, and L represents the range of pressure indicator dish, the force value of x for showing.For example: as shown in Figure 3, when total range is set to 50MPa, in the time of simulating the pressure indication of 25MPa, CODE=256 * 25 ÷ 50=128, i.e. CODE=" 10000000 " namely sends 11 bit data of " 00100000000 ".

11 serial data signal is by the serial ports RS-232C output of computing machine, and be input to level transferring chip MAX232 by the RS232C port on the interface panel, MAX232 can be Transistor-Transistor Logic level by the EIA level conversion with the level mode of this serial data signal, then the serial data signal after the level conversion can be by the P3.1 of single chip computer AT 89S53, the P3.0 pin is received by single-chip microcomputer AT89S53, preliminary setting data converse routine among the single chip computer AT 89S53, serial data is converted to the digital voltage signal that needs demonstration, this conversion can press the voltage range of the original dial plate of table to determine with the transformational relation of the pressure range that changes rear pressure indication dial disc according to pointer, the digital voltage signal that needs are shown is input among the D/A TLC5620 by the I/O mouth of single chip computer AT 89S53, the digital voltage signal that will be received from single chip computer AT 89S53 by D/A TLC5620 is converted to analog voltage signal, thereby the analog signal output DACA output analog voltage signal by TLC5620 reaches the purpose that steering needle is indicated to needle dc voltmeter, reads pressure data by the pressure indication dial disc.

Claims

1. the pressure simulation indicating gauge with serial communication interface is characterized in that, comprises needle dc voltmeter, serial communication circuit plate and interface panel;

Described serial communication circuit plate comprises single chip computer AT 89S53, level transferring chip MAX232, D/A TLC5620, the first external interface and the second external interface;

Described the first external interface has two ports, is respectively port A1 and port A2;

Described the second external interface has three ports, is respectively port B1, port B2, port B3;

The low level end of described single chip computer AT 89S53

A1 links to each other with port, reset terminal RST and low level end

Connect through electric capacity, reset terminal RST links to each other with port A2 through resistance, is connected with crystal oscillator between two output terminal XTAL1 of sheet internal oscillator inverting amplifier and the XTAL2, and XTAL1 all links to each other with port A2 through electric capacity with XTAL2;

Described level transferring chip MAX232 is used for realizing the conversion between the interface circuit Transistor-Transistor Logic level of the EIA level of computer serial interface standard RS-232C and single-chip microcomputer, level transferring chip MAX232 external capacitor end C1+ is connected electric capacity with external capacitor end C1-and connects, external capacitor end C2+ is connected electric capacity with external capacitor end C2-and connects, external voltage end V+ is connected electric capacity with supply voltage input end VCC and connects, external voltage end V-connects through electric capacity with power supply ground end GND, supply voltage input end VCC connectivity port A1, power supply ground end GND ground connection, Transistor-Transistor Logic level transmitted signal input end T1IN is connected with the serial output terminal mouth TXD of single chip computer AT 89S53, Transistor-Transistor Logic level receives signal output part R1OUT and is connected with the serial input port RXD of single chip computer AT 89S53, EIA level transmitted signal input end R1IN links to each other with port B1, and the EIA level receives signal output part T1OUT and links to each other with port B2;

Serial data latch signal end load among the described D/A TLC5620 links to each other with the I/O mouth P1.0 of single chip computer AT 89S53, serial data input clock end CLK links to each other with the I/O mouth P1.1 of single chip computer AT 89S53, serial data input end DATA links to each other with the I/O mouth P1.2 of single chip computer AT 89S53, reference voltage input terminal REFA connects+the 5V power supply;

Described interface panel comprises power interface and 9 core serial ports RS232C, wherein the power interface negative pole links to each other with port A2, the power interface positive pole links to each other with port A1, No. 2 tube cores of 9 core serial ports RS232C link to each other with port B1, No. 3 tube cores link to each other with port B2, No. 5 tube cores link to each other port B3 ground connection with port B3;

The dial plate range of described needle dc voltmeter adopts the pressure range that needs simulation, and the positive terminal of pointer pressure links to each other negative terminal ground connection with analog signal output DACA among the D/A TLC5620;

Described serial communication circuit plate is anchored on the postnotum inboard of needle dc voltmeter, and interface panel is fixed in the postnotum outside of needle dc voltmeter.