DK04 monitoring module with the computer communications interface circuits
The circuit described utilizes a universal asynchronous receiver-transmitter (UART) for serial communication, which is essential in various electronic applications for data exchange. The primary UART, D187, interfaces with the RX/TX signals through a series of optocouplers (N21, N22, and N29), which are crucial for ensuring electrical isolation between different sections of the circuit, particularly when interfacing with RS-485 communication standards. This isolation helps protect sensitive components from voltage spikes and noise that may occur in the communication lines.
The receiver/transmitter D28, along with microprocessor D211, is designed to maintain complete optical isolation, enhancing the reliability of data transmission. This isolation is vital in environments where ground potential differences may exist, preventing ground loops that could lead to data corruption or damage to the microprocessor.
D197 functions as a communication rate generator, currently set at 9600 bits per second, which is a standard baud rate for many serial communication applications. This setting allows for efficient data transfer while balancing speed and reliability.
Another UART, D189, provides additional flexibility in communication options. The use of optocouplers N204 and N206 for the local RS-232 communication port further emphasizes the design's focus on isolation, ensuring that the microprocessor D211 remains unaffected by any disturbances on the RS-232 lines.
The power supply section includes D209, which is a single isolated 5V power supply. This component is critical for powering the RS-232 driver chip, which is configured to handle 12V communication. The conversion from 5V to 12V is essential for meeting the voltage requirements of the RS-232 protocol, allowing for robust and reliable communication between devices.
Overall, the design of this circuit prioritizes isolation, reliability, and adaptability, making it suitable for various applications that require secure and efficient serial communication. As shown in FIG, D187 is a universal asynchronous receiver transmitter (UART), its RX/TX signal received optocoupler N21, the N22 and N29, so put the RS-485 communication inter face receiver/transmitter D28 and microprocessor D211 is completely optically isolated up. D197 is a generator, currently set communication rate is 9600bit/s. D189 is another universal asynchronous receiver transmitter. Optocoupler N204 and N206 to the local RS-232 communication port and a microprocessor D211 completely isolated. D209 is a single isolated 5V power supply is converted into a dedicated RS-232 driver chip for l2V communication.
Related Circuits
The primary issue with the design of a stereo amplifier that includes a total bass driver is that the signals from the left and right channels eventually become combined. This summation process minimizes the separation between channels, compromising the...
The three circuits were based on the vacuum tube ECC83, designed to produce phono preamplifiers in compliance with RIAA standards. The described circuits utilize the ECC83 vacuum tube, a dual-triode component known for its low noise and high gain characteristics,...
This is an 8048/IM80C48 microcomputer equipped with an 8-character, 16-segment ASCII triplex liquid crystal display. The two-bit character address is combined with the data and sent to the display driver under the control of the WR line. Port lines...
The circuit presented is a standard Colpitts oscillator, commonly utilized in many amateur radio homebrew transmitters. This specific circuit is designed to operate effectively within a frequency range of 1500 kHz to 8000 kHz. To accommodate lower frequencies, it...
Audio from a telephone line can be obtained using a transformer and capacitor to isolate the line from external equipment. A non-polarized capacitor is placed in series with the transformer line connection to prevent DC current from flowing in...
An often neglected area of study in modern electronics is that of tubes, more precisely known as vacuum tubes or electron tubes. Almost completely overshadowed by semiconductor, or "solid-state" components in most modern applications, tube technology once dominated electronic...