Controlling PCGU1000 from micro-controller

Hi,

Is there a way to control a PCGU1000 from a micro-controller other than implementing a USB host?

I read about a rs-232 link in the specs but cannot find any info.

Thank You

Patrick

The generator can be controlled via the COM (RS232) port of the PC. The commands can be sent to the PC via the COM port.
The generator must be connected to the USB host (PC).