Hi Ed,
Thanks for the suggestion. I am only using pins 2, 3 & 5 for the RS-232 
to the computer. I am also using the appropriate pins for the 301 remote 
knob. No other pins on the Omni VI 25 pin D connector are being used for 
anything.
Is there somewhere in the Omni VI manual or other Ten-Tec documentation 
that explains filter or mode selection through pins other than the TXD 
and RXD RS-232 data paths? I have never seen that. I know that there is 
band selection data FROM the radio, to control a Hercules II or a 253 tuner.
DE N6KB
>
> you need to be using only pins 2,3, and 5...IIRC. Sounds as tho you 
>might have other pins wired and the VI is picking these up as filter 
>selections.
>
>
>  
>
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