Bender ISOMETER iso1685DP-425 Manual page 67

Device communication
Termination
The optimum topology for an RS-485 network is a daisy-chain connection. In this connection,
device 1 is connected to device 2, device 2 to device 3, device 3 to device n etc. The RS-485
network represents a continuous path without branches.
Correct arrangement
Three examples for correct arrangement:
Wrong arrangement
Three examples for wrong arrangement:
Wiring
The following cable is recommended for wiring the RS-485 network:
Shielded cable, core diameter 0.8 mm (e.g. J-Y(St)Y 2x0.8), shield connected to earth (PE) on
one end.
The max number of bus nodes is restricted to 32 devices. If more devices are to be connected,
Bender recommends the use of a DI1 repeater.
isoxx1685Dx-x25_D00272_07_M_XXEN/09.2022
RS-485
CAN 2 CAN 2
Term.
off on
CAN 1 CAN 2 RS-485
Term.
I2+ I2- I1+ I1- off on
A B S k l kT IT 31 32 34
I2+ I2- I1+ I1-
A B S k I kT IT 31
A B S A B S
A A B B S S
K3 K2 K1
E KE A1 A2
21 22 24 11 12 14
32 34 21 22 24 11 12 14 E KE A1 A2
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