FULLDUP tnc command: How?


Trying to get full duplex TNC functionality for use with FalconSat-3.   Manual says the TNC command is "FULLDUP".

So, I connect via rs232 terminal emulator (cable connected to the control head, NOT the RF deck), and enter command "FULLDUP".

All I get in return is the following:


Has it actually worked?   Or is the "?" indicating that it has no clue what I asked of it?   Note that if I type in "ID" and hit enter, it comes back with "TM-D710GA" (or something similar), so I am definately connected to something.   Any suggestions?



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