C1, if you have the spare cash, I would recommend a cheap logic analyzer. Saelig sells one for (I think I paid) around $80 US. I haven't used mine in several years, as I now have a Pico Scope that does much more, and better. I am in the northeast US. If you're willing to cover shipping, you can have my old Saelig. It will help you to verify communication protocols and baud rates for situations like this. If interested, PM me & we can take it from there. You might be able to find one on eBay, Amazon, or Craigslist (or whatever local online sellers site you have) for next to nothing, and with cheaper or even no shipping.