INSTALLATION MANUAL
20221594 / B
15
TB12, Selector
SEL.4
SEL.2
SEL.3
SEL.1
SE
LE
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.
Offset heading adjustment
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 pulse switch between TB12, +12V and
SEL 3. When pressing and holding the switch, the heading will
increase or decrease, depending of last direction control.
The heading will increase in a slow rate for the first 3 degrees,
but change to high rate for as long as the switch is depressed. By
making a quick double press and keep the last press, the
direction is reversed and started with low rate. Single presses on
the switch changes the heading by one tenth of a degree.
Pendulum ferry feature
Based on reading an external potential free switch connected to
this terminal, GI51 will change the heading output 180° on
command for both the steering compass and monitor compass (if
installed).
The switch is connected b12V and SEL.4.
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