![]() This is in contrast to the half-duplex mode, when one link is used to receive and transmit data, which imposes a restriction on simultaneous operation, so in a half-duplex mode at one time, either the reception or transmission of information is possible. The RS-232 interface operates in full-duplex mode, which allows you to send and receive information at the same time, because different lines are used for receiving and transmitting. At a minimum distance, the speed is usually 115.2 kbps, but there is hardware that supports speeds of up to 921.6 kbps. The speed of the RS-232 depends on the distance between the devices, usually at a distance of 15 meters the speed is 9600 bps. The RS-232 interface (TIA / EIA-232) is intended for the organization of data transfer between the transmitter or terminal (Data Terminal Equipment, DTE) and the receiver or communication equipment (Data Communications Equipment, DCE) in the point-to-point scheme. 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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