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I worked it out. Needed to add inverters to the Tx/Rx lines.

Did you have any luck with these John? I bought a pair a couple weeks back, set both up on USB-Serial adapters, and they seam to be communicating, but its not making sense. If I type ABC on module 1, I get Ph( on module 2. If I type ABC on module 2, I get Ph( on module 1. If I type Ph( on...