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![]() Differences between RS232, RS422, RS485
USB to serial information article explaining the fundamental differences between RS232, RS422, and RS485 serial protocols. Briefly describes USB serial adapters.
What is serial communication protocol?Serial communication is the term used in telecommunication and computer science to define the process of sending data sequentially over a communication channel, one bit at a time. Serial communication protocols are rules that govern how this communication will take place. In today’s technology, the use of USB connectivity provides a broader and more functional USB Serial communication for RS232, RS422, and RS485 protocols and devices.
Types of USB to Serial Communication Protocols
RS232: This protocol defines the meaning, electrical characteristics (voltage level, signaling rate, maximum load capacitance), and timing of signals between data terminal equipment and data circuit-terminating equipment. In other words, it is an interface for connecting modems and data receiving devices (GPS receivers, data loggers etc) to computers. However, RS232 does not define elements such as framing or encoding of characters, bit rates for transmission and error detection protocols.
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Voltage levels: The voltage levels corresponds to logical one and logical zero levels and valid signals are in the range of -3 to +15 volts or -3 to -15 volts. The invalid ranges are -3 to +3 volts.
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