Revert "Mask range.unit with 0xff when determining the unit."

This reverts commit d721a0c05450c793a5e0e562d286a689565cf81b.

From the National Instruments E Series User Manual [1], page 3-2:

  Reference Selection

  (NI 6020E, NI PXI-6040E, NI 6052E, NI 6062E, NI 6070E/6071E, and
  PCI-MIO-16E-4 Devices Only) You can connect each DAC to the device
  internal reference of 10 V or to the external reference signal
  connected to the external reference (AO EXT REF) pin on the I/O
  connector. This signal applied to EXT REF should be within
  ±11 V. You do not need to configure both channels for the same mode.

So RF_EXTERNAL is a valid unit (i.e. in units of the AO EXT REF
signal).  The next commit will add this unit.

[1]: http://digital.ni.com/manuals.nsf/websearch/06115536722DAA558625728E007E6BA4
  Edition Date:					February 2007
  Part Number:   					370503K-01
  p

diff --git a/pycomedi/range.pyx b/pycomedi/range.pyx
index 6c05cde7e1dedcb65cf03eb8aff3c2451e31e0ac..c3e196a487668489bb098d4042bbf92954d37818 100644 (file)
--- a/pycomedi/range.pyx
+++ b/pycomedi/range.pyx
@@ -46,10 +46,6 @@ cdef class Range (_BitwiseOperator):
     >>> r.unit
     <_NamedInt mA>
     """
-    # other data gets packed into the unit unsigned int (e.g RF_EXTERNAL)
-    _uint_all = 0xffffffffL
-    _unit_all = 0xff
-
     def __cinit__(self):
         self.value = -1
 
@@ -71,10 +67,9 @@ cdef class Range (_BitwiseOperator):
         return self.__str__()
 
     def _unit_get(self):
-        return _constant.UNIT.index_by_value(self.range.unit & self._unit_all)
+        return _constant.UNIT.index_by_value(self.range.unit)
     def _unit_set(self, value):
-        self.range.unit &= self._uint_all - self._unit_all
-        self.range.unit |= _constant.bitwise_value(value) & self._unit_all
+        self.range.unit = _constant.bitwise_value(value)
     unit = property(fget=_unit_get, fset=_unit_set)
 
     def _min_get(self):