The proper method of wiring an rs 485 network is described with recommendations for twisted pair cabling and correctly locating termination resistors.
Rs 422 cable specification.
Rs 485 cable specification guide abstract.
Rs 422 systems can transmit data at rates as high as 10.
Another choice is the same cable commonly used in the twisted pair ethernet cabling.
It was intended to replace the older rs 232c standard with a standard that offered much higher speed better immunity from noise and longer cable lengths.
This cable commonly referred to as category 5 cable is defined by the eia tia ansi 568 specification.
To enable the differential driver to be used the rs 422 standard uses a four conductor cable.
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.
Received waveforms are shown for examples of proper and improper cable termination.
Rs 485 a descendant of rs 422 that can be used as a bus in multidrop configurations mil std 188 a system like rs 232 but with better impedance and rise time control eia 530 a high speed system using rs 422 or rs 423 electrical properties in an eia 232 pinout configuration thus combining the best of both.
Although rs422 is significantly different to rs232 it can often be used as a direct interface in many instances.
There are many cables available meeting the recommendations of rs 422 and rs 485 made specifically for that application.