Advantech RS-485 user manual Figure E-4 Grounding for signal wires

ADAM-4000/5000 System Grounding Installation

ØThe shielding material of the wires should only be grounded on one end as illustrated in the following diagram. This is to avoid ground loop.

ADAM System On-Site Facilities

AI

Grounding

Figure E-3: Grounding for on-site facilities and ADAM-5000/4000 Systems

ØSince shielded twisted-pair has been adopted for signal wires, only DATA+ and DATA- of ADAM-5000 system should be connected. And the shielding materials should be treated in the same manner as with AI and AO signal wires, i.e. it should be connected to Ground on only one end through the COM port on computer or on ADAM-5000 system such as illustrated in the following diagram:

PC

DATA+

DATA -

Gounded only on one end

Figure E-4: Grounding for signal wires

E-4 ADAM-5000