AUTOHELM ST 50 plus - SeaTalk Bus Ring Connection; Autopilot Integration

1 .6 Ring Connection
Installations with a large number of instruments on a SeaTalk bus may
require a second ring-main connection to the power supply
breaker to
prevent excessive voltage drops . Whether a second
ring main is required
can be determined from the following :
Cable run upto 10m (33ft)
Single connection :

13 instruments maximum
Second connection :

26 instruments maximum
Cable run upto 20m (66ft)
Single connection
:

7 instruments maximum
Second
connection :

13 instruments maximum
The second ring-main should
be connected to the spare lead on the last
instrument
in
the
chain and directed back to the circuit breaker
.
1 .7 Connection
to SeaTalk Compatible Autopilots
If the installation
includes a SeaTalk compatible Autopilot, ST50 Plus
instruments may be connected to the SeaTalk bus at
any point . No
independent connection to the 12V power supply is
necessary as the
instruments receive power from the Autopilot course
computer .