Appendix A Installation Considerations For Upgrading From Agarmin Gma 340; Mechanical Considerations; Electrical Considerations - Garmin GMA 342 Installation Manual

APPENDIX A INSTALLATION CONSIDERATIONS FOR UPGRADING FROM A
GARMIN GMA 340
NOTE
This appendix contains installation considerations for upgrading from a Garmin
GMA 340. This is not a set of comprehensive installation instructions for installing a
Garmin GMA 342/345 in place of a Garmin GMA 340. Read this manual in its entirety
before starting any installation.
A.1 Mechanical Considerations
• The GMA 340 installation rack is compatible with the GMA 342/345. Refer to
manual for a list of installation materials.
• The GMA 340 connectors are compatible and may be reused.
If replacing a GMA 340 with a GMA 342/345, the GMA 340 (330-00220-25) connector backshells can be
reused. However, grounding the wire shields to the GMA 342/345 will be easier with the Garmin
backshells in GPN 011-02302-00. The Garmin backshells also offer higher immunity to HIRF. Current
installations will not be required to change the backshell type, but would benefit from doing so.
A.2 Electrical Considerations
Figure A-1 shows the GMA 340 pins that may need to be modified to accommodate the GMA 342/345.
Refer to Section 4 and Appendix C
NOTE
If the GMA 340 installation to be replaced has three COM transceivers, the GMA 345
3-COM unit (Garmin PN 011-03520-20) should be used to accommodate the COM3
interface.
190-01878-02
Rev. 5
of this manual for a list of pin functions and interconnect examples.
Section 2.2
GMA 342/345 Installation Manual
of this
Page A-1