I need more than 2 serial ports, and although the USD manual says you can...

I need more than 2 serial ports, and although the USD manual says you can pass MachineControl though it, this doesn't work. When will the 9-pin ports on the USD be activated?

Although the ports were designed into the USD for this purpose, our investigations of the USD serial port pass through demonstrated that performance was not acceptable.Users with PT|24 and PT|24 MIX systems can connect the USD (or Machine Control device) to the digiSerial port (on the first MIX or d24 card).

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