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Installing Below Deck Unit (BDU)
How to Connect NMEA 0183 Gyrocompass Cable
1. Turn the screw located on the top of the 2-position terminal block counterclockwise enough using the
Phillips Screwdriver.
2. Connect NMEA 0183 Gyrocompass Cable to the terminal block.
Figure: NMEA 0183 Gyrocompass Cable Connection
Gyro
Cable
Phillips
Screwdriver
2-position
Terminal Block
NOTE
NOTE
When connecting the NMEA 0183 gyrocompass cable:
1. The positive and negative marks are shown on the top of the terminal block. Check
the positive and negative and correctly connect the cables.
2. Strip the end of the cables up to 5 mm (0.2"). Do not solder the cables.
2
1
3. Fully turn the screw clockwise to secure the cable. Apply equally to both positive and negative cables.
Connecting to Additional Secondary ACU (Optional: For Dual Antenna System)
To use the Dual Antenna System, the antenna system needs to be installed with the BDT and an addtional
ACU, which connected to each antenna to support the Dual Antenna System operation. The Primary BDT is
connected to the additional Secondary ACU as follows.
Connect the "RG-6 RF cable" from the "SECONDARY-Rx" connector on the rear of the "Primary BDT" to the
"PRIMARY-Rx" connector on the rear of the "Secondary ACU".
Connect the "RG-6 RF cable" from the "SECONDARY-Tx" connector on the rear of the "Primary BDT" to the
"PRIMARY-Tx" connector on the rear of the "Secondary ACU".
Connect the "Ethernet cable" to the each "LAN 3" connector on the rear of the "Primary BDT" and "Secondary
BDT".
Figure: Additional Secondary ACU Cable Connection for Dual Antenna System
Primary
BDT
Secondary
ACU
LAN 3
LAN 3
Primary
Tx
Primary
Rx
Secondary Rx
Secondary Tx
