Satel EASy+ - RS-422 Wiring; RS-485 Wiring

SATEL-EASy+
User guide
Version 1.33
78
16.2.3 RS-422 wiring
FUSE = 2 A slow
If the transmission lines are long the receiving end of the lines must be terminated using a
separate termination resistor (typical values range from 100 -120 ohm depending on the
characteristic impedance of the transmission line).
16.2.4 RS-485 wiring
Both ends of the transmission line should be terminated by connecting a separate terminating
resistor between the positive and negative signal wire. Typical values range from 100 – 120 ohm
depending on the characteristic impedance of the line.
FUSE = 2 A slow
NOTE! The RS-485/422 standards define only the electrical parameters of the signals (signal
level etc.). The connectors and the names of the signals are NOT defined. Different RS-485/422
standards or proprietary buses specify different names for the wires. Common signal names
used are ‘A’ and ‘B’, ‘+’ and ‘-’ or ‘hot’ and ‘cold’. Unfortunately, these names define the polarity