77 lines
3.1 KiB
Python
77 lines
3.1 KiB
Python
# *****************************************************************************
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Module authors:
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# Markus Zolliker <markus.zolliker@psi.ch>
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# Anik Stark <anik.stark@psi.ch>
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# *****************************************************************************
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from frappy.core import StringIO, HasIO, Writable, Parameter, Property, FloatRange, IntRange, BoolType
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from frappy.errors import CommunicationFailedError, HardwareError
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from frappy.ctrlby import WrapControlledBy
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class IO(StringIO):
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end_of_line = '\n'
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identification = [('ID?', '0\t.*')] # senden: ID?<lf>, Antwort: 0<ht> str version information<lf>
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class Heater(HasIO, Writable):
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ioClass = IO # define IO class for automatic creation of the IO module
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channel = Property('channel (source number)', IntRange(1, 3))
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value = Parameter('current reading', FloatRange(0, 0.1, unit='A'))
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target = Parameter('current target value', FloatRange(0, 0.1, unit='A'), readonly=False)
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on = Parameter('turn current on/off', BoolType(), readonly=False, default=False)
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def query_status(self):
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reply, txtvalue = self.communicate('STATUS?').split('\t')
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if reply != '0':
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raise CommunicationFailedError(f'Bad reply: {reply}')
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return txtvalue.split(',')
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def write_on(self, value):
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for _ in range(2):
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txtvalue = self.query_status()
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on_idx = (self.channel - 1) * 4 + 2
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if txtvalue[on_idx + 1] == str(int(value)):
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break
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setup = ['0'] * 12
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setup[on_idx] = '1' # toggle
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answer = ','.join(setup)
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reply = self.communicate(f'SETUP {answer}')
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if reply != '0':
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raise CommunicationFailedError(f'Bad reply: {reply}')
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else:
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raise HardwareError('unable to turn device on/off')
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def write_target(self, target):
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reply = self.communicate(f'SETDAC {self.channel} 0 {int(target * 1e6)}') # 0: autorange
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if reply != '0': # not as in manual
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raise CommunicationFailedError(f'Bad reply: {reply!r}')
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def read_value(self):
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txtvalue = self.query_status()
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current_range = txtvalue[(self.channel - 1) * 4 + 1]
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current = txtvalue[(self.channel - 1) * 4 + 1 + 1] # percent of range
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multipliers = {'1': 1e-4, '2': 1e-3, '3': 1e-2, '4': 1e-1}
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value = float(current) / 100 * float(multipliers[current_range])
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return value
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class WrappedHeater(WrapControlledBy, Heater):
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pass
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