#RS MEANING SOFTWARE#
The software method uses the Xon and Xoff characters (in the ASCII character Xon = 17, Xoff = 19) transmitted using the same TXD / RXD communication lines as the main data instead of the pins. If one of the signals is not set, no data transfer will occur. If the receiver is ready to receive data, it sets the signal on the CTS line. If the transmitter is ready to send data, then it sets the signal on the RTS line. The hardware method uses the RTS / CTS outputs. There is a hardware and software control method. In order not to lose data, there is a mechanism for controlling the flow of data, which allows to stop temporarily transferring data to prevent the buffer from overflowing. Stop bit - a bit indicating the completion of the message transmission, can take the values 1, 1.5 (Data bit = 5), 2.įor example, a reduction of 8E1 means that 8 data bits are transmitted, a parity bit is used in EVEN mode and a stop bit occupies one bit.
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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.
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#RS MEANING SERIAL#
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