Calcomp 9500

Dear GRASSusers,
we have a problem in using a Calcomp 9500 digitizer. We hope somebody can
help us. Here the situation:
1) We have GRASS4.1 (update 3) running under Linux on a 486.
2) The plotter is a Calcomp 9500, A0 format, 16 buttons.
3) bin/etc/digcap is correctly set to use a Calcomp 9500 Binary format 23
   (as in bin/etc/digitizers/cc95f23_16).
4) Using KERMIT we checked the digitizer is sending coordinates
   correctly, so the connections should be OK.
5) We set the soft switches of Calcomp according to the informations in
   cc95f23_16. More precisely: baud=9600, units per inch=1000, stop bits=1,
   data bits=8, parity=none. Anyway there are more switches in the
   digitizer, and we don't know how to set them.
6) Running v.digit, the list of "Available digitizers" includes the
   "Calcomp digitizer, format 23 (binary)".
   Next screen shows that "Selected digitizer is: Calcomp".
   Everything worhs OK until the question: "Shall we continue? [y]".
   Answering "y" the digitizer send a 'bip', the screen freezes and there
   is no way to go on.
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May be there is something wrong in setting the soft switches of
digitizer?
Is there anybody using the same digitizer that can help us?
Many thanks in advance.

Aldo Clerici
Istituto di Geologia, Paleontologia e Geografia
Universita' di Parma.
Italy.