XP Transponders User Guide Rev 1.3
Main Connector - Important Notes
All four power pins must be connected. Zener diodes are used on the DC Power pins to protect the
transponder against overvoltage and reverse polarity.
At least four of the ground pins must be connected. If you must leave one of the five ground pins
unconnected, you may leave #15 or #17 unconnected.
Pins 13, 18, and 19 are used for production programming and must NOT be connected.
Other Not-Connected pins 20 through 26 should not be connected (left floating).
Pin 11, Mutual Suppress, is designed to connect to an aiaft’s idietioal suppessio us. See the
Mutual Suppress paragraph in this document for details. Leave unconnected if not used.
ESD protection (at 2kV HBM or better) is provided on the main RS-232 interface pins
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