[plt-scheme] serial port access - Mac OSX POSIX

Our application talks to a device over an RS232 link (under OS X)
currently, the serial comms is done by a python app wth pyserial, which then 
serves the result to a PLT Scheme app.

pyserial just uses POSIX calls to talk to the (USB) serial port.

I can't find (google and help desk) how I would go about that in PLT scheme 
- other than by writing a C extension... Is there a POSIX terminal interface 
for MzScheme?

thanks

chris wright

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