To connect the ADU, BDU and modem
98-175666-A Chapter 2: Installation 2-29
2.6.2 To ground the modem
1. Make sure that the grounding requirements are met. See the appendix Ground and RF
protection on page B-1 for details about grounding.
2.7 To connect the ADU, BDU and modem
The following sections show how to connect the ADU, BDU and the modem.
1. Connect the antenna cable to Antenna at the BDU and the antenna.
2. Connect Rx Out at the BDU to Rx In at the modem with the supplied cable (75 Ohm
coax, F-F, 1 m).
3. Connect Tx In at the BDU to Tx Out at the modem with the supplied cable (75 Ohm
coax, F-F, 1 m).
4. Connect RS-232 on the BDU to RS-232 at the modem.
5. Connect RS-422 on the BDU to RS-422 at the modem.
6. Connect LAN1 at the BDU to the upper left RJ45 connector at the modem.
7. Connect the green terminal block for the heading input from the gyro. For pin allocation
see NMEA 0183 RJ-45 connector on page 3-2.
Figure 2-32: Ground stud, GMU
Figure 2-33: Connection between ADU, BDU and modem
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