MGE UPS Systems 66103, 66102 2 RS485 link configuration and connection, 2.1 RS485 connection

7.2.2 RS485 link configuration and connection

7.2.2.1 RS485 connection

La liaison EIA RS485, en 2 fils ou en 4 fils, doit être polarisée en un point unique de la ligne et adaptée aux deux extrémités de cette ligne pour un fonctionnement correct A TRADUIRE

Normally, the master of the network sets the polarity of the line. The INMC card is a slave equipment and don’t have polarisation resistor.

The two ends of the line must be terminated. Allow for 1 or 2 terminators to avoid mismatching the line when any equipment at the end of the line is disconnected.

The next figure gives the detail of the RS485 connector and the internals drivers:

Pin number

Function

1

R- : Receiver - (input)

2

R+ : Receiver + (input)

3

T- : Transmitter - (output)

4

T+ : Transmitter + (output)

5

0 V

Important notes:

Use twisted pair cable (cable specification 0.3mm2 and capacitance 42pF/m)

The transmission range will increase if a cable with lower capacitance and larger diameter is used. Use shielded cable in heavy industrial environments.

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Network Management Card – User Manual	34003991EN/DA	Page 80/120