Schneider Electric 66124, 66123 user manual 10.1.2 RS485 link configuration and connection

10.1.2 RS485 link configuration and connection

10.1.2.1 RS485 connection

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.

Network Management Card & Modbus/Jbus	34022321XT indice :AE	Page 66/98
Network Management Teleservice Card

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