Simrad GI51 Gyro Interface
12
20221594 / Cb
TB12, Selector
SEL.4
SEL.2
SEL.3
SEL.1
SE
L
E
CT
O
R
+12V
The selector lines option on TB12 are used both for heading
offset adjustment and for the optional pendulum function key
as described below.
Heading offset adjustment and alignment
Offset of initial heading will be required when a step or geared
synchro is connected in a stand-alone system. The function is
obtained by connecting a potential free pulse switch between
the
+12V
and
SEL.3
terminals on TB12. When pressing and
holding the switch, the heading will increase or decrease,
depending of last direction control. Refer page 9.
Pendulum ferry feature
Based on reading an external potential free switch connected
to this terminal, GI51 will change the heading output 180° for
both the selected steering and monitor compass connected to
GI51 or the NMEA or HS-port of the autopilot J50 Junction
Unit.
The switch is connected b12V and SEL.4.
Note!
This function will not apply for the rate compass RFC35R and
RC25 and compasses connected to the NI300X autopilot
interface.
Note!
Pendulum function key as described in section 4 may be
required.