CN1031417A - Digitally indicating recorder for measuring length - Google Patents

Abstract

Digitally indicating recorder for measuring length of the present invention is the instrument that a kind of measured value of the dimensional measuring instrument to band SYLVAC device for digit-displaying writes down.It is made up of CPU (central processing unit) plate, printer, keyboard three parts.Its prominent feature is the measurement data acquisition circuit that a special use is arranged, and timely and accurately the data code of device for digit-displaying output is delivered among the RAM, after handling by analysis, converts decimal number to and send printer prints.Registering instrument circuit of the present invention is simple, the structure compact, and cost is low, has higher P/C ratio.Outside the automatic accurate errorless record measurement data of decapacitation, also have and print to measure date, measured workpiece numbering, measure radix and carry out function such as plus and minus calculation, can be used for the measurer and the opertaing device of various use SYLVAC device for digit-displaying.

Description

Digitally indicating recorder for measuring length

The present invention relates to a kind of register instrument of length measurements.

Dimensional measuring instrument commonly used mostly is according to the direct reading of the scale on the instrument.Along with developing by leaps and bounds of electronic technology, successively developed the digital display device of measuring length in some developed country.For example the length device for digit-displaying of Switzerland SYLVAC company production is applied in China, and it matches with measurer (as slide calliper rule), can demonstrate measurement result in measuring process automatically.Survey crew is not read scale more thus, and is easy to use, directly perceived, and can reduce the error of artificial reading.But, thisly obtained the measurer that uses, measurement result can not have been noted, must remember shown digital defensive position Chinese realistic painting record by survey crew in China, measure labour intensity and still do not alleviated at all, but also the personal error in may occurring putting down.

The graphic meter that provides a kind of and aforementioned digital display appliance to match just is provided purpose of the present invention, measurement result can be shown by digital display device, can be printed on the paper automatically by register instrument of the present invention again, and can also on recording chart, print measuring workpieces numbering, measure the date and carry out plus and minus calculation of measurement data etc.

Digitally indicating recorder for measuring length of the present invention is actually the microprocessor system of a special use, carry out analyzing and processing by data-signal to the output of SYLVAC device for digit-displaying output interface after, the control printer is printed on measurement result on the paper as requested.It forms overall plan such as Fig. 1,2 by CPU (central processing unit) plate, keyboard, printer three parts.Wherein printer is the character wheel type printer that declines, and the CPU (central processing unit) plate is the micro processor controls plate of a special use.Core component of the present invention is the CPU (central processing unit) plate, comprises CPU, EPROM, RAM, keyboard interface, logical circuits such as printer interface and I/O address decoding, storage address decoding.Its outstanding feature is, it has a special measurement data acquisition circuit, and this circuit must be delivered to the data code of device for digit-displaying output among the RAM when keyboard sends the order of printing measurement data timely and accurately.

This Acquisition Circuit is according to the characteristics design of device for digit-displaying output signal.By detecting and decoding and learn that the SYLVAC device for digit-displaying has 2 output lines, wherein the single line output repetition period is the data code train of impulses of 250ms; The output repetition period is the synchronization burst of 250ms on the single line in addition, the change of its shape and measurement data is irrelevant, 49 pulses of every string, its overall width equates with the overall width of data code string, be 650ms, data pulse is and synchronizing pulse 49 codes one to one that Fig. 3 provides the wherein oscillogram of pulse train.Data acquisition circuit of the present invention has made full use of the synchronization burst repetition period at interval exactly, intercepts the pulse train between two intervals, then with DMA(direct memory access (DMA)) mode writes direct the data code of correspondence among the RAM.

Describe in detail below in conjunction with accompanying drawing:

Connection diagram when Fig. 1 is the registering instrument use;

Fig. 2 is the overall plan block diagram;

Fig. 3 is device for digit-displaying signal output waveform figure;

Fig. 4 is a logic schematic diagram of the present invention;

Fig. 5 is the logic schematic diagram of another embodiment of the present invention;

Fig. 6 is that keyboard is arranged synoptic diagram;

Fig. 7 is a flow chart.

Fig. 4 has provided specific embodiments of the present invention.At the data acquisition circuit described in this scheme mainly by 2 monostalbe trigger (J ₃, J ₆), 2 d type flip flop (J ₄, J ₇), 2 with the door (a J ₂, J ₅), 3 reverse swing door (J ₁, J ₁₀, J ₁₁), by T ₁, T ₂The level shifting circuit of forming, and counter (J ₈), bus switch (J ₉) form.The synchronizing pulse of digital display device output is through T ₁After the switching levels, from T ₁Collector output be connected to and a door J through reverse swing door ₂An input end, J ₂Output receive J ₃CP end and with door J ₅An input end.J ₃Q terminate to J ₄CP end, J ₄D termination high level, Q terminates to J ₅Another input end.J ₅Output terminal one tunnel receive J through reverse swing door ₈Counting end, lead up to J ₉With memory write signals with after receive the WR end of RAM, the one tunnel receives J ₆CP end.J ₆Q terminate to the BUSRQ end of CPU, receive J simultaneously ₇CP end.J ₇Q end link J ₂Another input end.J ₇D termination high level, the set signal is from the reset key of keyboard.J ₇, J ₆, J ₄, J ₃Reset signal from the I/O address decoding scheme.The BUSAK signal one tunnel that CPU sends is received J ₉Control end, the one tunnel with the storer chip selection signal with after receive the CS end of RAM.J ₈Output pass through J ₉Receive on the address bus.

Digital display device output data code is through T ₂After the switching levels, from T ₂Collector output, receive J through reverse swing door ₉, through J ₉Receive the D of data bus ₀On the position.

The concrete course of work is as follows: when instrument begins energising or resets, and d type flip flop J ₇RESET places one state by the exchange reset signal, i.e. Q=1, and Q=0, Q blocks control gate J ₂When keyboard sent the order of printer measurement data, CPU sent the peripheral hardware chip selection signal by I/O address decoding, and this signal is with J ₇, J ₆, J ₄, J ₃Reset, so J ₇Q=1, J ₂Open, synchronization burst is through triode T ₁, T ₂After the switching levels, pass through J ₂First passes through J ₂Trigger action J ₃, from J ₃The wide negative pulse of the about 2ms of Q end output, its trailing edge triggering J ₄, J ₄Q end uprise and open control gate J ₅Then pass through J ₅Be a string complete synchronizing pulse that we need.J is passed through in first pulse ₅The time, trigger monostable J ₆, from J ₆The wide negative pulse of the about 2ms of Q output, directly give CPU as bus request BUSRQ, CPU detect the BUSRQ signal effectively after, promptly can send response signal BUSAK after a while, CPU enters hold mode and abdicates bus control right simultaneously.Directly utilize the BUSAK(low level effective) open bus switch J ₉So J is passed through in the address that is formed by the synchronizing pulse counting ₉Deliver on the address bus, and data code is passed through J ₉Deliver on the data bus, at this moment the chip selection signal CS of RAM is also served as by BUSAK, and write signal (WR) is served as by the negative half-cycle of synchronizing pulse.So the data code of sending here from digital display device will write the corresponding address location of RAM like clockwork by turn.After about 2ms, J ₆Q end become high level, then BUSRQ becomes high level and lost efficacy, CPU detect BUSRQ invalid after, even BUSAK uprises after a while, then block bus switch J ₉, CPU is control bus again.At this moment measurement data all writes among the RAM already.Then, CPU is reading of data from the corresponding units of RAM, carries out analyzing and processing according to specific method, converts decimal number at last to and send printer prints to come out.These work are all finished by corresponding handling procedure.

From the structure of circuit, two tangible characteristics are arranged: the first has adopted unique pulse recognition method, is not to be conceived to the individual characteristics pulse, but has made full use of the synchronization burst repetition period at interval, intercepts the pulse train between two intervals; It two is not use the dma controller chip and the purpose that realized the DMA peek.This is to read the simplest of measurement data and effective method.

Fig. 5 has provided an alternative embodiment of the invention, and in this embodiment, described data acquisition circuit is with 6 8D trigger (J ₁₂, J ₁₃, J ₁₄, J ₁₅, J ₁₆, J ₁₇) shift register formed deposits serial data.J ₅The signal of output is received aforementioned 8D trigger J respectively ₁₂, J ₁₃, J ₁₄, J ₁₅, J ₁₆, J ₁₇CK end, the output terminal of 8D trigger is received on the data bus, produces 6 I/O address by the I/O address code translator and receives J respectively ₁₂, J ₁₃, J ₁₄, J ₁₅, J ₁₆, J ₁₇Control end.J ₆Q terminate to J ₇CP end, and J ₇Q end remove and receive J ₂Input end outside, another road through differentiating circuit and through with the door shaping after receive CPU INT hold.The data code of device for digit-displaying output is through T ₂Switching levels also is connected to J through reverse swing door ₁₂1D end.J ₁₂8Q termination J ₁₃1D end, J ₁₃8Q terminate to J ₁₄1D end, by that analogy, form 48 bit shift register.This circuit is sent out interrupt request to CPU after with shift register data code all being deposited earlier, in the CPU response, has no progeny, and be that unit sequence reads J with the byte ₁₂J ₁₇Data, deposit among the RAM.

Another outstanding feature of digitally indicating recorder for measuring length of the present invention is that three part keyboards, printer, the CPU (central processing unit) plate that constitutes this registering instrument all is contained in and forms one (as Fig. 1) on the casing.Printer is positioned at front part of a body (eyes are faced the keyboard direction), and keyboard is installed on the panel, and the CPU (central processing unit) plate is installed in casing inside.Keyboard and printer are connected on the CPU (central processing unit) plate by plug, and the CPU (central processing unit) plate draws a cable by edge connector and link on the SYLVAC device for digit-displaying, and keyboard has multiple function, and the numerical character key is arranged

, , decimal key , reset key , date, numbering printing key

, the radix printing key

, keep 2 decimal measured value printing keys

With 4 decimal measured value printing keys of reservation , the space character printing key

, and as the spare key (see figure 6) that expands in the future its purposes.

Content of the present invention also comprises the data processor among the EPROM of being solidificated in that is exclusively used in registering instrument of the present invention except that above-mentioned hardware circuit and body, keyboard Designing, Keyboard Control program, print control program and Measurement and Data Processing program are arranged.The outstanding feature of data processor of the present invention is with the compilation language compilation, cooperates aforesaid data acquisition circuit, realizes decoding and processing to SYLVAC device for digit-displaying output code.Specific procedure is: behind the program start, at first system is carried out initialization, then carry out keyboard scan, judge to have or not button to press, do not have button to scan by next continuation.If numerical key presses, return scanning after then storing the numerical character sign indicating number; If press the date, the coding printing key then print the numerical character of being keyed in; If press the function key of printing radix, then preserve and print the radix of key entry; If press the key of printing measured value, then by the program start data acquisition circuit, make it to enter dma mode and measurement data is directly sent among the RAM, after the DMA peek is finished, program begins the code among the input RAM is carried out analyzing and processing, and then the result with analyzing and processing send printer prints to come out.Program circuit is seen Fig. 7.

Length digital display recorder of the present invention has the following advantages:

1, hardware circuit is simple, whole recorder structure compact, and cost is low, and P/C is than high;

2, multiple functional, available keyboard input is also printed and is measured date, measured workpiece numbering, measurement radix etc. In the situation that has radix to insert, also can automatically measured value be carried out plus and minus calculation, print the result of plus-minus;

3, decapacitation is pressed outside the display precision (keeping 2 decimals) of device for digit-displaying, also can select to keep 4 decimal output prints. In case of necessity, also can print more high-precision measured value to after the modification of program, satisfy the requirement of all high-acruracy surveys;

4, highly versatile, the various measurers of all use SYLVAC device for digit-displaying and other forms of opertaing device, but all adapted registering instrument of the present invention carries out record.As setting up communication interface and corresponding software on it, measurement result directly can be sent to the Quality Mgmt Center computing machine, unified aggregation process.

Claims (5)

1, a kind of digitally indicating recorder for measuring length, form by CPU (central processing unit) plate, printer, keyboard three parts, CPU (central processing unit) plate hardware circuit comprises logical circuits such as CPU, EPROM, RAM, keyboard interface, printer interface and I/O address decoding, storage address decoding, it is characterized in that digitally indicating recorder for measuring length of the present invention has a special measurement data acquisition circuit, this circuit is mainly by 2 monostalbe trigger (J ₃, J ₆), 2 d type flip flop (J ₄, J ₇), 2 with the door (a J ₂, J ₅), 3 reverse swing door (J ₁, J ₁₀, J ₁₁), by T ₁, T ₂The level shifting circuit of forming, and counter (J ₈), bus switch (J ₉) form, the synchronizing pulse of device for digit-displaying output is through T ₁After the switching levels, from T ₁Collector output through reverse swing door J ₁Be connected to and door J ₂An input end, J ₂Output receive J ₃CP end and with door J ₅An input end, J ₃Q terminate to J ₄CP end, J ₄D termination high level, Q termination J ₅Another input end, J ₅Output terminal one tunnel receive J through reverse swing door ₈Counting end, lead up to J ₉With storer and signal with after receive the WR end of RAM, the one tunnel receives J ₆CP end, J ₆Q hold the BUSRQ end of CPU, receive J simultaneously ₇CP end, J ₇Q end link J ₂Another input end, J ₇D termination high level, the set signal is from the reset key of keyboard, J ₃, J ₄, J ₆, J ₇Reset signal from the I/O address decoding scheme, the BUSAK signal one tunnel that CPU sends is received J ₉Control end, the one tunnel with the storer chip selection signal with after receive the CS end of RAM, J ₈Output pass through J ₉Receive on the address bus, in addition, digital display device output data code is through T ₂After the switching levels, from T ₂Collector output, through reverse swing door J ₁₁Receive J ₉, through J ₉Receive the D of data bus ₀On the position.

2, digitally indicating recorder for measuring length according to claim 1 is characterized in that described measurement data acquisition circuit is with 6 8D trigger (J ₁₂, J ₁₃, J ₁₄, J ₁₅, J ₁₆, J ₁₇) form shift register and deposit string argument certificate, J ₅The signal of output is received J respectively ₁₂, J ₁₃, J ₁₄, J ₁₅, J ₁₆, J ₁₇CK end, J ₁₂, J ₁₃, J ₁₄, J ₁₅, J ₁₆, J ₁₇Output terminal receive on the data bus, produce 6 I/O address by the I/O address code translator and receive J respectively ₁₂, J ₁₃, J ₁₄, J ₁₅, J ₁₆, J ₁₇Control end, J ₆Q terminate to J ₇CP end, and J ₇Q end remove and receive J ₂Input end outside, another road through differentiating circuit and through with the door shaping after receive the INT end of CPU, the data code of digital display device output is through T ₂Switching levels also is connected to J through reflection door ₁₂1D end, this circuit is after with shift register data code all being deposited earlier, to send out interrupt request to CPU, in the CPU response, have no progeny, be that unit sequence reads J with the byte ₁₂, J ₁₃, J ₁₄, J ₁₅, J ₁₆, J ₁₇Data, deposit among the RAM.

3, according to claim 1,2 described digitally indicating recorder for measuring length, it is characterized in that described keyboard, printer, CPU (central processing unit) plate are loaded on one with a casing, printer is positioned at front part of a body, keyboard is installed on the panel, the CPU (central processing unit) plate is installed in casing inside, keyboard and printer are connected on the CPU (central processing unit) plate by plug, also draw a cable by edge connector on the plate and receive on the socket of SYLVAC device for digit-displaying.

4, digitally indicating recorder for measuring length according to claim 3 is characterized in that described keyboard has the numerical character key , decimal key

, reset key , date, numbering printing key , the radix printing key

, keep 2 decimals and measure the numerical value printing key Measure the numerical value printing keys with 4 decimals of reservation

, the blank character printing key

, and as expanding in the future the spare key of its purposes.

5, a kind of data processor among the EPROM of being solidificated in that is exclusively used in aforementioned registering instrument, comprise the Keyboard Control program, print control program and Measurement and Data Processing program, it is characterized in that with the compilation language compilation, cooperate above-mentioned data acquisition circuit, realize decoding and processing the code of SYLVAC device for digit-displaying.Behind the program start, at first system is carried out initialization, then carry out keyboard scan, judge to have or not button to press, do not have button then to continue scanning,, return scanning after then storing the numerical character sign indicating number if numerical key presses; If press

Key is then printed the numerical character of being keyed in; If pressed the function key of printing radix (

), then preserve and print the radix of key entry; If pressed the key of printing measured value (

), then by the program start data acquisition circuit, making it to enter dma mode and measurement data is directly sent among the RAM, after the DMA peek was finished, program began the code among the input RAM is carried out analyzing and processing, and then the result with analyzing and processing send printer prints to come out.

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