Here's a Quick Way to Connect RS232 Equipment
Additional Information:
Where and why do I connect the field ground on RS232, RS422 or RS485 communication cables?
Shielded Cable with Drain Wire
The drain wire is connected to the housing of the communication cable end connected to the PLC side of the cable. This will filter the ambient noise to one end. Connecting both ends will produce more noise on the cable.
Here is a Method That can Help You with Difficult Level Sensing
The Secret Of Getting Rid Of Noise On Your Analog Signal
The Secret Of Getting Rid Of Noise On Your Analog Signal
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