You will still need some sort of microprocessor between the device and the siteplayer module. A PIC chip would do this perfectly.

The problem with the siteplayer module is that the serial interface is actually for a predefined siteplayer specific language that allows you to write and read values from the siteplayer memory. You'd need to put some work into it before you cacn use any random serial device.

They say they will release a new firmware that allows telnet access directly to the serial port but they've been promising this for a few months now and haven't done anything about it yet.

You might want to either consider using something else like the Rabbit boards or waiting to see if they release the necessary updates.

- Trevor