Design of Data Acquisition System Based on RS-232

1. Design topic: Design of data acquisition system based on RS-232

2. Design purpose

1. Master the performance indicators, characteristics and usage methods of the MAX232 chip;

2. Master the performance indicators, characteristics and usage of ADC0832 and CD4051 chips;

3. Master the performance indicators, characteristics and usage of SST89E516RD microcontroller, and understand the software programming method of SST89E516RD microcontroller to control ADC0832 and CD4051;

4. Understand the circuit composition and working principle of 7805 DC stabilized power supply

3. Design tasks and requirements

Design data acquisition and RS-232 communication hardware circuits and complete the following tasks:

1. The data collector with the single-chip microcomputer as the core collects the eight-channel analog quantity and eight-channel switch value in real time, and the collected data is processed by the single-chip microcomputer and sent to the PC through the RS-232 serial port line

2. After the PC receives the collected data, it will be dynamically displayed by the graphical interface. When the parameter exceeds the limit, it will give an audible and visual alarm.

1. Design topic: Design of data acquisition system based on RS-232

2. Design purpose

1. Master the performance indicators, characteristics and usage methods of the MAX232 chip;

2. Master the performance indicators, characteristics and usage of ADC0832 and CD4051 chips;

3. Master the performance indicators, characteristics and usage of SST89E516RD microcontroller, and understand the software programming method of SST89E516RD microcontroller to control ADC0832 and CD4051;

4. Understand the circuit composition and working principle of the 7805 DC stabilized power supply.

3. Design tasks and requirements

Design data acquisition and RS-232 communication hardware circuits and complete the following tasks:

1. The data collector with the single-chip microcomputer as the core collects the eight-channel analog quantity and the eight-channel switch value in real time, and the collected data is processed by the single-chip microcomputer and sent to the PC through the RS-232 serial port line;

2. After the PC receives the collected data, it will be dynamically displayed by the graphical interface. When the parameter exceeds the limit, it will give an audible and visual alarm.

Introduction to MAX232 Chip

This product is a chip compatible with the RS232 standard introduced by Texas Instruments (TI). Since the RS232 level of the computer serial port is -10v ~ +10v, and the signal voltage of the general microcontroller application system is TTL level 0 ~ +5v, MAX232 is used for level conversion. The device includes 2 drivers and 2 receivers and a voltage generator circuit to provide TIA/EIA-232-F levels

Level shift principle

The working principle is: TTL/CMOS data is converted from T1IN, T2IN input to RS-232 data from T1OUT, T2OUT to the computer DB9 plug; RS-232 data of DB9 plug is converted from R1IN, R2IN input to TTL/CMOS data After conversion from R1OUT , R2OUT output. From TTL to RS2323 level, the voltage at the junction of the diode and the capacitor is kept at -3V~-15V due to the function of the diode and the capacitor inside the MAX232. When TXD is "1" (TTL), the internal transistor is turned off, the voltage on PCRXD is equal to the PCTXD voltage, and -3~-15V is "1" (RS232) When TXD is "0" (TTL), the internal transistor is If it is turned on, the PCRXD voltage is about +5V, and this voltage is between +3~+15V. According to the RS232 level, it is "0", that is to say, after the "1" of TTL passes through this level conversion circuit, RS2323 can It is recognized that it is "1", and it can also be recognized as "0" if it is "0". This achieves level shifting from TTL to RS232

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Data Acquisition System RS-232 Cable

Data acquisition Serial Communications Cable 

Data acquisition RS-232 communication Cable

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