Hi Jeff,
Are you sure you have configured the correct USB Port to ‘Transponder Trig’? Which port have you connected your Transponder Lead to? With the Ethernet Port on the left, they are numbered...
E 1 3
2 4
Baud rate in both units needs to be the same - i.e. 9600Baud. If in doubt, give me a call.
Regards
Peter