Just had a thought: does TRA take 2 params as in:

        TRA #channel,addr
or
        TRA port,addr

In which case, you need to use something like: 

        TRA 1,start

based on your:

        BAUD 1,9600
        SER_BUFF 1,0

Robert

[I apologise if I have it totally wrong...this is sheer guesswork)

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