Barrett 550 programming software

I have just bought a Barrett 550 which I want to set up for marine use.

Does any one know where I could acquire the necessary software to make this possible?

Taking or sending the set to a dealer is probably not feasible in this part of the world so any help would be appreciated.

I've looked at the demo software for the 900 series. Unfortunately while the software prints to file it does not appear to address the serial port.

I have the manual including tech drawings for the set so have been able to fabricate a programming lead.

I would really appreciate any help.

Many thanks.