host: elwood
path: /usr/local/database/faq/graphic/html
file: epc_recorder.htm

M. Braun - 10.03.00


FAQ: Emulation of an EPC-Recorder


Q: Is it possible to make a data output to the EPC recorder visible,
   when no recorder is available ?

A: Yes ! The data output of the workstation for the EPC recorder is organized
   in lines of 2048 pixels, each of them with an 8 bit value for the amplitude.
   The EPC recorder shows this data set as one line with 256 different grey
   shades.

   A data file with this information can be generated as follows. Modify the
   following entries in "periphery.ini":

      [SSCAN1]
      ! C T R L
      ctrl_dev=/dev/c0p1_lp         (unchanged)
      ctrl_ixon=NO                  (unchanged)
      ctrl_ixoff=NO                 (unchanged)
      ctrl_ctsxon=YES           --> NO
      ctrl_rtsxoff=YES          --> NO
      ! D A T A
      data_dev_type=centr           (unchanged)
      data_dev=/dev/ssrecorder  --> /tmp/sscan_data.out

   Let the hydromap online run on a workstation with a serial interface
   (NOT elwood !!). Activate the output for the sidescan recorder. The data
   will appear in the file mentioned above.

   This data file must be expanded with a leading header to convert it to a
   Windows Bitmap.

   For details, see BMP_graphic.htm.