RS232 is a classic serial communication standard designed for direct, point-to-point connections between a single controller (such as a PC or MCU) and an HMI. It is the most cost-effective solution for short-range data transmission.
The effective transmission distance for RS232 is typically limited to 15 meters. Due to its single-ended signaling, it is susceptible to electromagnetic interference. It is best suited for localized equipment, laboratory instruments, and debugging ports where high-speed networking is not required.
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