Originally I was looking for a simple serial to USB converter cable but headed down the arduino path
when I couldn't find one that fit the bill...
Not sure if USB2Serial Light from Arduino or a FTDI cable would work any better/easier as they seem to convert USB TXD & RXD into a 5v TTL level and I need to interface to a true rs2s2 +/1 12v TXD & RXD.
I am using a standard configuration connection to the arduino with a Max 3222 IC but when it is connected to the arduino, the RXD line seems to be loaded down so that no signal is seen on it. When I remove the part, (or even just lift the pin of the part) this line toggles like it should when I am typing characters into my keyboard while connected to hyper terminal.
The connections are correct but I wonder if the arduino can't drive this Max 3222 line for some reason.
I am open to use an inexpensive (+/- 12v) serial to USB adapter for this if anyone has a link of one that would fit the fill.
thanks