EX-2001 NC RACER ZSME300000091
23
EXCELL PRECISION CO., LTD.
WIRING NOTICE
2
Transmission wire
Twisted pair is a must. The quality of the transmission has great effect on the transmission
signal. Twisted pair with low quality (e.g. PVC wire) gives a really weak signal when the
transmission rate is high. The distance of transmission decreases largely and anti-noise ability
become worse. Suggest using twisted pair in polyethylene (e.g. Belden 9841) in circumstances
of high transmission rate, long distance and high noises.
2
Connection method
Connection method of RS-422 and RS-485 are as follow: The transmission wire should be
from the first station to the second station, from the second station to the third
station……until the last station.
2
FG Grounding
Though RS-485 has two wires to connect, it is easy to be disturbed by yawp. The potential
difference among any station does not exceed 7 V (IC permitted), or RS-485 does not work.
In use, whatever the ground potential is, we suggest using the twisted pair. FG connected
to the ground wire to clear the potential. Supply the shortest loop of the transmission signal
to improve the anti-noises.
The shorter,
the better
RS-422
The shorter,
the better
The shorter,
the better
RS-422
RS-422
RS-422 BUS CONNECTING
The shorter,
the better
The shorter,
the better
RS-485
RS-485
RS-485
RS-485 BUS CONNECTING
A
B
