3.4.2 Communication to the DCU
The RIO 425 comes preconfigured to communicate with the DCU 410E/408E or DCU
210E/208E in the Auto-Maskin Marine Pro range.
It can be used together with other RIO expansion modules on the same RIO link.
Only one RIO 425 can be used on a RIO link.
Communication Wiring
Depending on the DCU model connect the wires in the shielded communication cable to the
terminals as shown in the table below:
RIO 425
DCU 410E / DCU 408E
DCU 210E / DCU 208E
S (Shield)
57 (Shield)
B (L)
58 (L)
C1.5 (L)
A (H)
59 (H)
C1.6 (H)
Do
not
connect the cable shield at both ends.
To minimize the effect of external noise it is recommended to use twisted pair wires.
Communication Bus Termination Resistor
The 120 ohm (1/4 W) termination resistor shall be connected at the last RIO unit (furthest
away from the DCU) in the RIO link chain.
If the RIO 425 is the only unit on the RIO link, then the termination resistor shall be
connected at the RIO 425.
Connect the resistor directly across terminals A and B on the RIO 425.
If the RIO 425 is not the last RIO unit on the link, then the termination resistor shall not be
connected to the RIO 425, but at the last RIO unit on the RIO link.
If there are
several units
attached to the
link add the 120
Ohm resistor
together with the
last unit on the
bus.
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