PMW-EX3 8-pin remote autobaud

My company makes remote camera control systems and I'm writing the software now to control a PMW-EX3. I've got the protocol from Sony, but they have not been very helpful answering my questions. My problem is that the RS422 is coming out of the 8-pin remote connector at 562.5 kbaud and that is too fast. Sony tells me that it will communicate at slower speeds but I can't find out how from the documentation. This forum seems to be mostly end users, but can anybody point me to another forum or another person who is familiar with the technical guts of the remote interface?