ENERGIZE YOUR ENTERPRISE
Network Management Card
– User Manual 34003991EN/DA Page 80/120
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 0.3mm
2
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.
