GB - 13
Control circuit
2.1.4.5 Wiring RS485 half duplex
5 4 3 2 1
9 8 7 6
COMBIVERT
4 58 9
5 4 3 2 1
9 8 7 6
COMBIVERT
4 58 9
Master
RXD/TxD-A
RXD/TxD-B
R
R
R=120Ω
7
7
1)
1) The ground connection is used to reduce communication disturbances
Although the functional earth is connected correctly potential differences be-
tween the bus nodes can occur at long lines which disturb the communica-
tion. To avoid the interface from destruction by high circulating current based
on this, potential differences can be reduced by connection of an additionally
ground line between the controls (0V terminal). To avoid interference coupling
into the signal line, lay these additionally ground cable outside of the bus line !
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