KR20030085772A - The data acquisition device and its method using PC printer port - Google Patents

Abstract

PURPOSE: A data collection method and system is provided to output data on a monitor, inputted via a printer port of a PC, at a display device of the PC, and to store the data at a hard disk of the PC. CONSTITUTION: The method comprises several steps. An application program is started if a Run button is pushed(S1). A thread for an unlimited repetition is started(S2). Variables, to be set by a hardware and a software, are initialized(S3). The values of measurement range set by the user on a display are stored(S4). Decoder values are set in order that the values of measurement range are selected by a measurement range control circuit via a decoder(S5). The values of measurement range are output to a printer port(S6). In order to make an AD converter receive data, a buffer is enabled(S7). The data stored at the buffer is read via the printer port(S8), and the buffer is displayed for receiving the next data(S9). The data read via the printer port is arranged and stored(S10). A variable for the number of called data is initialized(S11). The variable for the number of called data is compared with that for the number of stored data(S12). If there exists the data to be read, the step S7 is repeated for receiving new data via the printer port. Otherwise, the stored data is called(S13), and displayed at the display(S14). The variable for the number of called data is increased(S15). The thread for the unlimited repetition is stopped(S17).

Description

The data acquisition device and its method using PC printer port}

The present invention is a data acquisition system (DAS: Data Acquisition System) using a computer printer port. Specifically, data acquisition using a computer printer port designed to convert electrical measurement signals into digital data, receive this digital data through a computer's printer port, display it on a computer monitor screen, and store it on a computer hard disk. It is about a device.

Conventionally, as a device capable of measuring data, a digital oscilloscope is expensive and there is a difficulty in learning how to use it professionally.

In the case of a data acquisition device connected to the computer ISA / PCI bus, if the computer OS (Windows, Linux, Unix, etc.) and the ISA / PCI bus use request collide, the computer may be down or the computer may crash if severe. Price is also expensive.

In the case of measuring the data by setting the computer printer port to SPP (standard mode), the data input speed of the printer port set to the standard mode is too slow compared to the speed of the ISA bus, so it is difficult to accurately measure the signal.

The present invention is to set the printer port of the personal computer to ECP mode or EPP mode that can guarantee the speed of the ISA bus, and connect the data acquisition device of the present invention to the printer port thus set Measures electrical signals, converts them into digital data, receives digital data through the printer port, displays it on a computer monitor screen, and acquires data using a computer printer port that can store the acquired data on a computer hard disk. And storage devices.

Drawing 1.

1. Printer port of personal computer (1)

2. Buffer (3)

3. Analog to Digital Converters (5)

4. Clock generator (7)

5. Measuring range adjusting circuit section (9)

6. Decoder (11)

The present invention sets the printer port of the computer to ECP mode or EPP mode that can guarantee the speed as much as the ISA bus, and connects the data acquisition device of the present invention to the printer port thus set, and measures the electrical signal. By converting the signal into digital data, the digital data can be input to the printer port and displayed on the computer monitor screen, and the acquired data can be stored on the computer hard disk, and the measurement range of the electrical signal can be adjusted by the user. It relates to a data acquisition device using a computer printer port characterized in that.

In the present invention, Nos. 2-9, 10-13, and 15 are used for data transmission in the printer port, and transmit signals from the outside to the PC. In 14 and 16, data is sent from the PC to the printer or external device. Data acquisition device according to the present invention is a device to perform a data acquisition function through the output and input line of the parallel port.

With reference to the accompanying drawings, a data measuring apparatus using a parallel port according to the present invention will be understood by the embodiments described in detail below.

As shown in Fig. 1, the hardware configuration of the present invention selects the desired measurement range to the measurement range circuit section 9 via the decoder 11. Data input from the measurement range circuit section 9 is converted into a digital signal through an analog / digital signal converter 5 and stored in the buffer 3. The timing converted by the analog / digital signal converter 5 is converted into the clock coming out of the clock generator 7. The value stored in the buffer 3 enters data through the printer port.

It converts analog signals into digital signals and inputs them to a computer. It uses a digital / analog converter (5) such as ADS7804. The clock generation function (7) uses a clock generator such as NE555 to generate pulses. (3) wrote 74LS244 as a function of temporarily storing the signal from the analog / digital converter, and 74LS139 as the function of the decoder (11) to make four signals with two signals.

The devices may be replaced with other devices that perform the same or similar functions. In this design, 12-bit device is used. In order to enhance the function, it is also possible to use a device with high resolution such as 16 bits.

2 is a flowchart of a program for implementing a data measurement apparatus using a parallel port according to the present invention on a screen.

The program starts and (S1) starts when the RUN button is pressed. Start the thread to repeat indefinitely (S2). Initialize the variables set by hardware and program (S3). Save the value that set the desired measurement range on the screen (S4). To select the value in the measurement range adjusting circuit section 9 through the decoder 11, the decoder value is set (S5). Then, the value is output to the printer port 1 (S6). In order to receive data from the analog-to-digital converter 5, the buffer 3 is enabled to operate (S7). The value stored in the buffer 3 is read through the printer port 1 (S8). The buffer is displayed to receive the next value (S9). The value read from the printer port 1 is stored as an array (S10). In order to draw a graph on the screen, the variable (variable of the number of loaded data) is initialized (S11). The size of the variable of the number of stored data and the variable of the number of loaded data is compared (S12). If there is remaining data to be compared, go to (S13), if not, go back to (S7) and accept a new data value through the printer port (1). The stored data is called up (S13) and shown on the screen (S14). Then, the variable of the number of data loaded to load the data is increased (S15). Stop the thread for repeating the STOP (S16) button on the screen (S17).

As described above, the data measuring apparatus using the parallel port according to the present invention is merely an embodiment for carrying out the present invention, and the present invention is not limited to the above-described embodiment, as claimed in the following utility model registration claims. Without departing from the gist of the invention, anyone of ordinary skill in the art to which the invention belongs will have a technical spirit of the present invention to the extent that various changes can be carried out.

The data acquisition apparatus using the computer printer port according to the present invention only needs to be connected to the printer port as when the printer is connected. The printer port's ECP / EPP mode is standard on your computer, so you can easily move it to another computer.

In addition, the data acquisition speed corresponding to the computer ISA bus can be realized, which can be implemented at a relatively low cost compared to a conventional high-speed digital oscilloscope, thereby making the instrument popular.

In addition, it is easy to store and store the acquired measurement data because it is connected to a computer, and various comparative analysis is possible while storing / storing various signals.

Claims (4)

A measuring device using a printer port of a computer, comprising: Set the printer port mode of the computer to the ECP or EPP mode and measure the electrical signal by connecting to the printer port; And converting the measurement signal into digital data, receiving digital data through a printer port, displaying the same through a computer monitor screen, and storing the acquired data on a computer hard disk. In the data acquisition device of claim 1 Analog-to-digital converter for converting analog signals to digital signals, clock generator for converting analog-to-digital converters, buffers for temporarily storing the converted data in analog-to-digital converters, and adjustment of measurement range Data measuring device, characterized in that the measuring range adjustment section including a decoder to enable. The method of claim 2 Data measuring device using parallel port, characterized in that the measurement range of the signal under measurement can be selected on the computer by the address decoding signal of the printer port The method of claim 2 12-bit data is a data measurement device using a parallel port characterized in that the parallel port can be transferred directly to the data and status register of the parallel port.