Simrad IS20 Manual page 54

Connecting IS20 to an NMEA2000 network
No daisy-chain connection is permitted between SimNet
units when connected to an NMEA2000 network!
Use the SimNet cable (part no 24005729) to connect the
IS20 to an MNEA2000 network.
54 | Installation
1. Maximum total length of SimNet cables is 150 m
(500 ft.)
2. Drop cables must not exceed 6 m (19 ft) of length
and the total length of drop cables must not exceed
60 m (200 ft).
3. Equipment should not be daisy-chained in a drop
cable.
4. The wind transducer (*) has a built in terminator.