ADS-B FDL-978 Series and
Lite Series Installation Manual
Document No. 87343 Rev G
FFS Copyright © 2016 All rights reserved.
2-13
Time Mark inputs from a single ended PPS source (e.g. Garmin Series 400/500
GPS) must be properly interfaced to the differential interface for reliable operation.
Refer to SECTION 9 for suggested connection.
The Time Mark input/output pin connections are as follows:
Time Mark Input
PIN
SIGNAL
ELECTRICAL
I/O
DESCRIPTION
J1-39
PPS IO+
ARINC 743A/B
I/O
Internal/External GPS Pulse Per Second Out/In+
J1-40
PPS IO-
ARINC 743A/B
I/O
Internal/External GPS Pulse Per Second Out/In-
2.5.10
Maintenance Port Interface
The Maintenance Port Interface (MPI) can be used to configure the system, provide installation
status information, and update system software/firmware. The MPI should be used by qualified
installation personnel to configure and update the system.
MPI functionality is provided through Serial Port 3 or Serial Port 5 (preferred) on the FDL-978
Series DB-44 connector. A female DB-9 connector can be mounted in the aircraft for convenient
MPI access to a standard RS-232 interface meeting the specifications of TIA/EIA-232-F,
Interface Between DTE and DCE Employing Serial Binary Data Interchange.
If both ports are configured and connected to other aircraft equipment, the MPI can still be
accessed if the configured device is not actively connected. An inline connector is
recommended to be installed between the devices and used to temporarily disconnect the
configured device and permit external MPI access.
The figure below shows an example of Port 5 connecting to a standard female DB-9 (DE-9F)
RS-232 connector as an inline connection or dedicated MPI port. This allows any other
standard RS-232 device to communicate with the FDL-978.
Figure 8. Inline MPI Connector and Compatible MPI Devices
The MPI connector can be mated to an off-the-shelf RS-232 to USB converter or a battery
powered Serial-to-Wi-Fi MPI Module (P/N 87710-00) for configuration and troubleshooting.
Refer to Sections 3.4 and 3.5 for more information on configuring the FDL-978 through the MPI.
The table below shows the MPI DE-9F connections to Port 3 or Port 5 on the FDL-978.