Rs485 Link Configuration And Connection - MGE UPS Systems 66102 User Manual

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
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:
Important notes:
Use twisted pair cable (cable specification 0.3mm
The transmission range will increase if a cable with lower capacitance and larger diameter is used.
Use shielded cable in heavy industrial environments.
ENERGIZE YOUR ENTERPRISE
Network Management Card – User Manual
A TRADUIRE
Pin number
1
2
3
4
5
2
and capacitance 42pF/m)
34003991EN/DA
Function
R- : Receiver - (input)
R+ : Receiver + (input)
T- : Transmitter - (output)
T+ : Transmitter + (output)
0 V
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