I've had a productive evening today. The software is now polling correctly, I had my laptop hooked up to my Vitara and I was getting RPM, TPS, MAP and a few other readings OK. I've a few tweaks to make to the address look up tables and I'll release a new build.
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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine 2000 Suzuki Vitara 1.6 8V, many mods 2004 Suzuki Ignis 1.5VVT 4Grip 2006 Suzuki Jimny 1.3VVT JLX+ and many more.