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RS-422, also known as TIA/EIA-422, is a technical standard originated by the Electronic Industries Alliance, first issued in 1975, that specifies electrical characteristics of a digital signaling circuit.
RS-422, formally known as TIA/EIA-422, is a technical standard specifying electrical characteristics for balanced voltage digital interface circuits. This standard, which emerged as an improvement over the earlier RS-232, is designed for extended-distance data transmission with higher reliability.
ANSI TIA/EIA-422 and TIA/EIA-485 standards, commonly known as RS-422 and RS-485, respectively, specify balanced data-transmission schemes for transmitting data over long distances in noisy environments. These standards are compared, and their basic differences and similarities are discussed.
The RS-422 and RS-485 standards have been around for quite awhile, but are still used heavily today. Let's take a closer look and see why.
RS-422 is a differential standard that allows transmission over much greater distances. The higher input resistance of RS-422 inputs, combined with their higher drive capability, allows a connection of up to ten nodes (Figure 4). Another RS-422 advantage is the separate transmit and receive paths for which no direction control is needed.
The RS-232, RS-422 and RS-485 designations refer to interfaces for digital data transmission. 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).
RS-422 standard was introduced to allow data transfer over serial data lines at a higher rate than possible with RS-232. The primary reason RS-422 can achieve these improved results is the use of differential or balanced transmission techniques.
RS-422 is a technical standard for serial communication that allows for data to be transferred between devices. It’s a bit like a telephone line for machines, where one machine can “talk” to another by sending information back and forth.
RS422 protocol. RS422 is similar to RS232 protocol, and can be programmed in the same way, however, offers a few advantages and disadvantages. One problem is that you need to purchase an RS422 port or at least an RS422 to RS232 converter, since PC's don't come standard with this interface.
What is RS-422/RS-485? Definition. RS-485 and RS-422 are serial interface standards in which data is sent in a differential pair (two wires, or twisted pair cable), which allows greater distances and higher data rates than non-differential serial schemes such as RS-232. See: Differential Signaling.