Abbey B06-071 Manuel d'installation - Page 3

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RS-485 Connection and Termination

CN2

We recommend the use of three-core screened cable for linking the converter to any

IED(Intelligent Electronic Device), with the screen connected to the GND pin of the

converter only.

If the cable is of the two-core screened type, use the screen as the GND wire.

The use of 120Ω termination resistors at each end of a long cable run is also

recommended to reduce signal reflections. RS-485 communication at low data rates

and short cable lengths will normally work without them, but their presence causes

no problems so they are always recommended.

CN2

RS-485 Connection and Termination

If two or more IEDs are used, make sure they are set to different addresses. Also

check the IED documentation to confirm that the IEDs can be multi-dropped, and to

find the maximum allowable number and recommended cable length for each IED.

Isolation

The converter does not provide electrical isolation. Isolation is recommended and

should be provided by the RS-485 interface in each IED.

Stand-alone products can also provide isolation if there is none present on the IED.

IG-518-4-2012-Feb

Looking at the end of CN2, the pin

configuration is as follows:

Some manufacturers also refer to

Data+ as 'Data A', 'True Data', or 'non-Inverted Data' and

Data- as "Data B' or 'Inverted Data'.

Screened

Multi Core

IED 1

D+

D-

Screened

Multi Core

Screen

Function

Data+ or A

Data- or B

GND

IED n

D+

D-

B06-071 Installation Guide