The utility model discloses a marine
optical fiber compass system data unit with four-
compass input. The marine
optical fiber compass system data unit comprises a CUP board, a
communication interface board, an inter-board plug-in and fixing piece, a guide rail type supporting frame, a protection panel and a
label. The CUP board comprises a main processor, a
coprocessor, a CPU board power supply, a dual
CAN bus interface, a Gyro4 half-duplex interface, a
control unit power supply and
communication interface and an external
clock system; the
communication interface board comprises a Gyro1-3 interface, a BAM interface, a
satellite guide receiving and
relay / output interface, a
dry contact signal interface, four groups of output interfaces, two paths of RS485 multifunctional interfaces, a communication power supply module, a system power supply, a redundant power supply detection module and a filtering and protection circuit. The inter-board plug-in and fixing piece comprises a pin header, a female header, a hexagonal
copper column for fixing, a flat
gasket, an elastic
gasket, a nut and a screw. According to the utility model, four paths of compass signals can be accessed, so that information such as multi-compass redundant course angles, course angular speeds and the like can be provided for ships.