Tt22 xpdr offline

Error message XPDR OFFLINE.

Trig COMM radio TN92, ADC, Flightbox Pro work fine.

Grounded pin 13 (XPDR Enable) on Trig TT22 - no joy.

Checked all power, ground and connectors - all good. Power is 13.9 VDC.

XPDR has 0Hz data rate.

See photos.

Please advise.

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