What is RS422 communication standard?
Communication standard RS422 is a serial communication standard. RS422 supports high speed communication and long data transmission distance. Each signal is transmitted on a twisted pair (2 wires) and that is different from other communication standards. With a distance of 40 feet (equivalent to 12m), the maximum data rate is 100 Kilobytes per second. A 120 – Ohm resistor is connected in series at the end of the line to prevent reflection and interference. RS422 is often used between one transceiver and another. However, at each output, up to 10 receivers can be transmitted.
Features of RS422 communication standard:
+ 1 Driver up to 10 Receivers
+ Maximum line length and speed:
- 40 Feet = 12m 10 Mbits/sec
- 400 Feet = 122m 1 Mbits/sec
- 4000 Feet = 1219m 100 kbits/sec
What is the difference between RS485 and RS422?
The RS485 communication standard is a communication standard built on the standard RS422 platform. The main difference is that RS485 allows up to 32 transceiver pairs to be on the line at the same time. Similarly, RS485 also needs a 120 Ohm impedance at the end of the line to prevent signal reflection and loss. If more than one device needs data transmission, the RTS line is used as a control line, allowing data transmission.
Features of RS485 communication standard:
+ Up to 32 Driver/Receiver Pairs
+ Maximum line length and speed:
- 40 Feet = 12m 10 Mbits/sec
- 400 Feet = 122m 1 Mbits/sec
- 4000 Feet = 1219m 100 kbits/sec
