Westermo MA-49, Руководство по установке

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11 6049-2001
Transmission range (interface 2)
Use twisted pair cable. Max transmission range 1 200 m. (cable specifications 0.3 mm 2
and capacitance 42 pF/m).
The transmission range will increase if a cable with lower capacitance and larger
diameter is used. Use shielded cable in heavy industrial environments.
Line connection
1) If shielded cable is used, connect the shield only at one end to avoid ground currents.
Twisted pairs
A’
B’
A
B
Transmitter
Receiver
MA-49
Receiver
Transmitter
Shield
1)
1
2
3
4
5
3
4
5
A/A’
B/B’
Transmitter/
Receiver
A/A’
B/B’
MA-49
Transmitter/
Receiver
2-wire 4-wire
Twisted pairs
RS-422
equipment
A
B
A’
B’
RS-485
equipment
Shield
1)