33
AcuDC 210/220 Series
The shield of each segment of the RS485 cable must be connected to the ground
at one end only.
Make sure each point is connected properly.
Avoid T connection at each point.
Keep cables away as much as possible from sources of electrical noise. An anti
signal reflecting resistor (typical value 120~300ohm/0.25W) is normally added to
the end of the circuit beside the last meter if the communication quality is distorted.
Use RS232/RS485 or USB/RS485 converter with optical isolated output and surge
protection