Information transmitted via RS-232, RS-422 and RS-485 interfaces is structured as a protocol, for example, the Modbus RTU protocol is widely used in the industry. You will learn more about this in the article. Typically, TxD, RxD and GND ground lines are used, the remaining lines are needed to control the data flow. ![]() * For the RS-232 interface, it is not necessary to use all contact lines. The table shows the main differences between RS-232, RS-422 and RS-485 interfaces.ģ2 (with repeaters larger, usually up to 256) The RS-422 and RS-485 interfaces are widely used in the industry for connecting various equipment. The RS-232 standard is better known as a normal computer COM port or serial port (although Ethernet, FireWire and USB can also be considered as a serial port). ![]() The RS-232, RS-422 and RS-485 designations refer to interfaces for digital data transmission. The main differences between RS-232, RS-422 and RS-485
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