What is a RS-422 interface?
RS-422, also known as TIA/EIA-422, is a technical standard originated by the Electronic Industries Alliance that specifies electrical characteristics of a digital signaling circuit. RS-422 specifies differential signaling, with every data line paired with a dedicated return line.
What is RS-422 serial communication?
The RS422 Standard defines a serial communications standard. RS422 is a high speed and/or long distance data transmission. Each signal is carried by a pair of wires and is thus a differential data transmission system. Over distances up to 40 feet the maximum data rate is 100 Kilobytes per second.
What is the difference between RS232 and RS-422?
RS232 is full-duplex, RS485 is half-duplex, and RS422 is full-duplex. RS485 and RS232 are only the physical protocol of communication (ie interface standard), RS485 is the differential transmission mode, RS232 is the single-ended transmission mode, but the communication program does not have much difference.
Where is RS422 used?
RS422 was introduced to enable higher data rates to be transferred over serial data lines than was possible with RS232. RS422 is able to provide data rates of up to 10 Mbps at distances up to 50 feet (15.24 metres).
Does RS422 require termination?
Termination is not required on all differential networks, but it does typically extend the maximum cable length. The following chart shows the maximum cable lengths at various baud rates with and without termination: Compute the cable length for 115,200 baud RS422.
Can you split RS422?
RS422 was designed for 1 driver and up to 10 receivers on line, but I often see spec. with up to 32 receivers. communication is reduced to half duplex…. that is: you can’t send and receive at the same time.
How do I connect 2 RS422 devices?
Connecting two 4-wire RS422 devices is a fairly simple task. One pair of twisted wires is used for Receive, the other for Transmit. Some applications use a 2-wire RS422 configuration, where a master uses one wire pair and ground to talk to multiple devices that receive only, no transmission.
Where is RS-422 used?
Is RS-422 synchronous?
The master and slave are synchronized by the common clock of the controller. The CLOCK and DATA signals are transmitted according to RS-422 standards. The DATA output of the sensor is driven by an RS-422/485 line driver.
Is RS232 compatible with RS422?
RS-422 is not strictly compatible with RS-232, but most RS-422 drivers will act like a single-ended driver if only one output line is used. In this way, the RS-422 “A” output can be used to drive either an RS-232 input directly.