frappy_psi: add dtmpressure

frappy_psi/dtmpressure.py

@@ -0,0 +1,37 @@
+# *****************************************************************************
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+# details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# Module authors:
+#   Anik Stark <anik.stark@psi.ch>
+# *****************************************************************************
+
+from frappy.core import StringIO, HasIO, Readable, Parameter, Property, FloatRange
+
+
+class IO(StringIO):
+    end_of_line = '\r'
+    identification = [('IDN*', '.*')]       # expected reply?
+    default_settings = {'baudrate': 9600}
+
+
+class Pressure(HasIO, Readable):
+
+    ioClass = IO
+
+    value = Parameter('pressure', datatype=FloatRange(unit='mbar'))
+    scale = Property('global scale factor', datatype=FloatRange(), default=1)
+
+    def read_value(self):
+        return self.communicate('PRES?') / self.scale       # any other reply?