adopt frappy_psi and frappy changes from wip

Change-Id: I4e6732e755398d88b73007fb53b758039c5d4483

frappy/client/__init__.py

@@ -391,16 +391,17 @@ class SecopClient(ProxyClient):
                         else:
                             module_param = self.internal.get(f'{ident}:value', None)
                     if module_param is not None:
+                        now = time.time()
                         if action.startswith(ERRORPREFIX):
-                            timestamp = data[2].get('t', None)
+                            timestamp = data[2].get('t', now)
                             readerror = frappy.errors.make_secop_error(*data[0:2])
                             value = None
                         else:
-                            timestamp = data[1].get('t', None)
+                            timestamp = data[1].get('t', now)
                             value = data[0]
                             readerror = None
                         module, param = module_param
-                        timestamp = min(time.time(), timestamp)  # no timestamps in the future!
+                        timestamp = min(now, timestamp)  # no timestamps in the future!
                         try:
                             self.updateValue(module, param, value, timestamp, readerror)
                         except KeyError:

frappy/io.py

@@ -239,7 +239,7 @@ class StringIO(IOBase):
 
         a flag to indicate whether the first message should be resent once to
         avoid data that may still be in the buffer to garble the message''',
-        datatype=BoolType(), default=False)
+        datatype=BoolType(), default=True)
 
     def _convert_eol(self, value):
         if isinstance(value, str):

frappy/mixins.py

@@ -71,8 +71,11 @@ class HasOutputModule:
 
     def initModule(self):
         super().initModule()
-        if self.output_module:
-            self.output_module.register_input(self.name, self.deactivate_control)
+        try:
+            if self.output_module:
+                self.output_module.register_input(self.name, self.deactivate_control)
+        except Exception:
+            self.log.info(f'{self.name} has no output module')
 
     def set_control_active(self, active):
         """to be overridden for switching hw control"""

frappy/protocol/dispatcher.py

@@ -489,6 +489,9 @@ class Dispatcher:
             modobj.setRemoteLogging(conn, level)
 
     def handle_logging(self, conn, specifier, level):
+        if specifier == '#':
+            self.log.handlers[1].setLevel(int(level))
+            return LOGGING_REPLY, specifier, level
         if specifier and specifier != '.':
             modobj = self._modules[specifier]
             modobj.setRemoteLogging(conn, level)

frappy/protocol/interface/tcp.py

@@ -143,6 +143,7 @@ class TCPRequestHandler(socketserver.BaseRequestHandler):
         if not data:
             self.log.error('should not reply empty data!')
             return
+        self.log.debug('send %r', data)
         outdata = encode_msg_frame(*data)
         with self.send_lock:
             if self.running:

frappy_psi/bkpower.py

@@ -0,0 +1,67 @@
+# *****************************************************************************
+# 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:
+#   Markus Zolliker <markus.zolliker@psi.ch>
+#   Jael Celia Lorenzana <jael-celia.lorenzana@psi.ch>
+# *****************************************************************************
+"""Powersupply B&K Precision BK168xB"""
+
+from frappy.core import StringIO, Readable, Parameter, FloatRange, Writable, HasIO, BoolType
+
+class IO(StringIO):
+    end_of_line = ('OK\r', '\r')
+    default_settings = {'baudrate': 9600}
+    
+    
+class Power(HasIO, Readable):
+    value = Parameter(datatype=FloatRange(0,300,unit='W'))
+    
+    def read_value(self):
+        reply = self.communicate('GETD')
+        volt = float(reply[0:4])/100
+        current = float(reply[4:8])/100
+        return volt*current
+
+    
+class Output(HasIO, Writable):
+    value = Parameter(datatype=FloatRange(0,100,unit='%'))
+    target = Parameter(datatype=FloatRange(0,100,unit='%'))
+    maxvolt = Parameter('voltage at 100%',datatype=FloatRange(0,60,unit='V'),default=50,readonly=False)
+    maxcurrent = Parameter('current at 100%',datatype=FloatRange(0,5,unit='A'),default=2,readonly=False)
+    output_enable = Parameter('control on/off', BoolType(), readonly=False)
+    
+    def initModule(self):
+        super().initModule()
+        self.write_output_enable(False)
+        
+    def write_target(self, target):
+        self.write_output_enable(target != 0)
+        self.communicate(f'VOLT{round(max(8,target*self.maxvolt/10)):03d}')
+        self.communicate(f'CURR{round(target*self.maxcurrent):03d}')
+        self.value = target
+        
+    def write_output_enable(self, value):
+        self.communicate(f'SOUT{int(not value)}')
+        
+    def write_maxvolt(self, maxvolt):
+        self.communicate(f'SOVP{round(maxvolt*10):03d}')
+        
+    def write_maxcurrent(self, maxcurrent):
+        self.communicate(f'SOCP{round(maxcurrent*100):03d}')
+        
+    def shutdown(self):
+        self.write_target(0)
+    

frappy_psi/drums.py

@@ -0,0 +1,65 @@
+# *****************************************************************************
+# 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:
+#   Markus Zolliker <markus.zolliker@psi.ch>
+# *****************************************************************************
+"""iono pi max relais drums
+
+for demo purposes
+"""
+
+from frappy.core import Module, Attached, FloatRange, StringType, Writable, Parameter
+
+
+class Drums(Writable):
+    target = Parameter('drum speed', FloatRange(unit='beats/min'))
+    left = Attached(Writable)
+    right = Attached(Writable)
+    pollinterval = Parameter('drum interval', FloatRange(0, 10, unit='s'), readonly=False)
+    pattern = Parameter('''pattern
+
+                        a string containing:
+                        L,R: left / right relais on
+                        l,r: left / right relais off
+                        blank: wait''', StringType(), readonly=False)
+    _pos = 0
+    _wait = 0
+
+    def initModule(self):
+        super().initModule()
+        self.actions = {'L': self.left, 'R': self.right}
+
+    def write_target(self, target):
+        self.pollinterval = 60 / max(1, target)
+        self.value = target
+
+    def doPoll(self):
+        if not self.target:
+            return
+        if self._wait:
+            self._wait -= 1
+            return
+        if self._pos >= len(self.pattern):
+            self._pos = 0
+        for i, action in enumerate(self.pattern[self._pos:]):
+            upper = action.upper()
+            relais = self.actions.get(action.upper())
+            if relais:
+                relais.write_target(upper == action)  # True when capital letter
+            else:
+                self._wait = int(action) - 1
+                self._pos += i + 1
+                return

frappy_psi/furnace.py

@@ -0,0 +1,49 @@
+# *****************************************************************************
+# 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:
+#   Markus Zolliker <markus.zolliker@psi.ch>
+# *****************************************************************************
+
+"""interlocks for furnance"""
+
+import time
+from frappy.core import Module, Writable, Attached, Parameter, FloatRange, Readable, BoolType, ERROR, IDLE
+
+class Interlocks(Module):
+    input = Attached(Readable, 'the input module')
+    vacuum = Attached (Readable, 'the vacuum pressure')
+    wall_T = Attached (Readable, 'the wall temperature')
+    control = Attached(Module, 'the control module')
+    relais = Attached(Writable, 'the interlock relais')
+    wall_limit = Parameter('maximum wall temperature', FloatRange(0, unit='degC'),
+                           default = 50, readonly = False)
+    vacuum_limit = Parameter('maximum vacuum pressure', FloatRange(0, unit='mbar'),
+                             default = 0.1, readonly = False)
+    
+    def doPoll(self):
+        super().doPoll()
+        if self.input.status[0] >= ERROR:
+            self.control.status = self.input.status
+        elif self.vacuum.value > self.vacuum_limit:
+            self.control.status = ERROR, 'bad vacuum'
+        elif self.wall_T.value > self.wall_limit:
+            self.control.status = ERROR, 'wall overheat'
+        else:
+            return
+        self.control.write_control_active(False)
+        self.relais.write_target(False)
+        
+      

frappy_psi/ionopimax.py

@@ -0,0 +1,125 @@
+# *****************************************************************************
+# 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:
+#   Markus Zolliker <markus.zolliker@psi.ch>
+#   Jael Celia Lorenzana <jael-celia.lorenzana@psi.ch>
+# *****************************************************************************
+
+from frappy.core import Readable, Writable, Parameter, BoolType, StringType,\
+    FloatRange, Property, TupleOf, ERROR, IDLE
+from math import log
+
+
+class Base:
+    addr = Property('address', StringType())
+
+    def read(self, addr, scale=None):
+        with open(f'/sys/class/ionopimax/{self.devclass}/{addr}') as f:
+            result = f.read()
+        if scale:
+            return float(result) / scale
+        return result
+
+    def write(self, addr, value, scale=None):
+        value = str(round(value * scale)) if scale else str(value)
+        with open(f'/sys/class/ionopimax/{self.devclass}/{addr}', 'w') as f:
+            f.write(value)
+
+
+class DigitalInput(Base, Readable):
+    value = Parameter('input state', BoolType())
+    devclass = 'digital_in'
+
+    def read_value(self):
+        return self.read(self.addr, 1)
+
+
+class DigitalOutput(DigitalInput, Writable):
+    target = Parameter('output state', BoolType(), readonly=False)
+    devclass = 'digital_out'
+
+    def write_target(self, value):
+        self.write(self.addr, value, 1)
+
+
+class AnalogInput(Base, Readable):
+    value = Parameter('analog value', FloatRange())
+    rawrange = Property('raw range(electronic)', TupleOf(FloatRange(),FloatRange()))
+    valuerange = Property('value range(physical)', TupleOf(FloatRange(),FloatRange()))
+    devclass = 'analog_in'
+
+    def read_value(self):
+        x0, x1 = self.rawrange
+        y0, y1 = self.valuerange
+        self.x = self.read(self.addr, self.scale)
+        return y0 + (y1 - y0) * (self.x - x0) / (x1 - x0)
+
+
+class VoltageInput(AnalogInput):
+    scale = 1e5
+
+    def initModule(self):
+        super().initModule()
+        self.write(f'{self.addr}_mode','U')
+
+
+class LogVoltageInput(VoltageInput):
+
+    def read_value(self):
+        x0, x1 = self.rawrange
+        y0, y1 = self.valuerange
+        self.x = self.read(self.addr, self.scale)
+        a = (x1-x0)/log(y1/y0,10)
+        return 10**((self.x-x1)/a)*y1
+
+
+class CurrentInput(AnalogInput):
+    scale = 1e6
+    rawrange = (0.004,0.02)
+
+    def initModule(self):
+        super().initModule()
+        self.write(f'{self.addr}_mode','U')
+
+    def read_value(self):
+        result = super().read_value()
+        if self.x > 0.021:
+            self.status = ERROR, 'sensor broken'
+        else:
+            self.status = IDLE, ''
+        return result
+
+
+class AnalogOutput(AnalogInput, Writable):
+    target = Parameter('outputvalue', FloatRange())
+    devclass = 'analog_out'
+
+    def write_target(self, value):
+        x0, x1 = self.rawrange
+        y0, y1 = self.valuerange
+        self.write(self.addr, x0 + (x1 - x0) * (value - y0) / (y1 - y0),self.scale)
+
+
+class VoltageOutput(AnalogOutput):
+    rawrange = (0,10)
+    scale = 1e3
+
+    def initModule(self):
+        super().initModule()
+        self.write(f'{self.addr}_enabled', '0')
+        self.write(f'{self.addr}_mode', 'V')
+        self.write(f'{self.addr}', '0')
+        self.write(f'{self.addr}_enabled', '1')

frappy_psi/ips_mercury.py

@@ -28,9 +28,9 @@ from frappy_psi.magfield import Magfield, SimpleMagfield, Status
 from frappy_psi.mercury import MercuryChannel, off_on, Mapped
 from frappy.states import Retry
 
-Action = Enum(hold=0, run_to_set=1, run_to_zero=2, clamped=3)
+Action = Enum(hold=0, run_to_set=1, run_to_zero=2, clamped=3, not_found=4)
 hold_rtoz_rtos_clmp = Mapped(HOLD=Action.hold, RTOS=Action.run_to_set,
-                             RTOZ=Action.run_to_zero, CLMP=Action.clamped)
+                             RTOZ=Action.run_to_zero, CLMP=Action.clamped, NOT_FOUND=Action.not_found)
 CURRENT_CHECK_SIZE = 2
 
 
@@ -161,6 +161,7 @@ class Field(SimpleField, Magfield):
         if self.switch_heater == self.switch_heater.on:
             self.__persistent_field = current
             self.forced_persistent_field = False
+            self._field_mismatch = False
             return current
         pf = self.query('DEV::PSU:SIG:PFLD')
         if self.__persistent_field is None:

frappy_psi/mercury.py

@@ -294,6 +294,7 @@ class HeaterOutput(HasInput, Writable):
     volt = 0.0  # target voltage
     _last_target = None
     _volt_target = None
+    _resistivity = 10
 
     def read_limit(self):
         return self.query('DEV::HTR:VLIM') ** 2 / self.resistivity
@@ -329,10 +330,15 @@ class HeaterOutput(HasInput, Writable):
             res = volt / current
             tol = res * max(max(0.0003, abs(volt - self._volt_target)) / volt, 0.0001 / current, 0.0001)
             if abs(res - self.resistivity) > tol + 0.07 and self._last_target:
-                self.write_resistivity(round(res, 1))
-                if self.controlled_by == 0:
-                    self._volt_target = math.sqrt(self._last_target * self.resistivity)
-                    self.change('DEV::HTR:SIG:VOLT', self._volt_target, tolerance=2e-4)
+                res = round(res, 1)
+                if self._resistivity != res and 10 <= res <= 100:
+                    # we want twice the same value before changing
+                    self._resistivity = res
+                else:
+                    self.write_resistivity(res)
+                    if self.controlled_by == 0:
+                        self._volt_target = math.sqrt(self._last_target * self.resistivity)
+                        self.change('DEV::HTR:SIG:VOLT', self._volt_target, tolerance=2e-4)
         return volt * current
 
     def read_target(self):

frappy_psi/pdld.py

@@ -0,0 +1,68 @@
+# *****************************************************************************
+# 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:
+#   Markus Zolliker <markus.zolliker@psi.ch>
+# *****************************************************************************
+"""PDLD Laser"""
+
+
+from frappy.core import StringIO, Parameter, HasIO, \
+    Writable, FloatRange, BoolType, IDLE, ERROR
+
+
+class IO(StringIO):
+    end_of_line = ('>', '\r')
+
+
+class Laser(HasIO, Writable):
+    ioClass = IO
+    value = Parameter('on/off', BoolType())
+    target = Parameter('on/off', BoolType())
+
+    def get_par(self, cmd):
+        return float(self.communicate(cmd).split()[-1])
+
+    def read_value(self):
+        reply = float(self.communicate('MCM').split()[-1])
+        if reply == 10:
+            self.status = IDLE, ''
+            return True
+        if reply in (0, 40):
+            self.status = IDLE, ''
+            return False
+        return ERROR, 'bad OP mode %s', reply
+
+    def write_target(self, value):
+        if value:
+            self.communicate('SALO')
+        else:
+            self.communicate('SALS')
+
+
+class LaserPower(HasIO, Writable):
+    value = Parameter('power readback', FloatRange(unit='mW'))
+    target = Parameter('power setpoint', FloatRange(0, 300, unit='mW'), readonly=False)
+    ioClass = IO
+
+    def read_value(self):
+        return float(self.communicate('MPO').split()[-1])
+
+    def read_target(self):
+        return float(self.communicate('MPR').split()[-1])
+
+    def write_target(self, value):
+        self.communicate(f'SPR{int(value):03d}')
+

frappy_psi/pfeiffer.py

@@ -0,0 +1,64 @@
+# *****************************************************************************
+# 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:
+#   Markus Zolliker <markus.zolliker@psi.ch>
+# *****************************************************************************
+"""pfeiffer TPG vacuum pressure reading"""
+
+from frappy.core import StringIO, HasIO, Command, StringType, IntRange, \
+    IDLE, WARN, ERROR, Readable, Parameter, Property
+from frappy.errors import CommunicationFailedError
+
+ACK = '\x06'
+ENQ = '\x05'
+
+
+class IO(StringIO):
+    end_of_line = '\r\n'
+    default_settings = {'baudrate': 9600}
+
+    def communicate(self, command, noreply=False):
+        with self._lock:
+            ack = super().communicate(command)
+            if ack != ACK:
+                raise CommunicationFailedError('no ack received')
+            if noreply:
+                # to be used for changing parameters when needed
+                return None
+            return super().communicate(ENQ)
+
+
+class Pressure(HasIO, Readable):
+    value = Parameter(unit='mbar')
+    channel = Property('channel number', IntRange(1,2), default=1)
+
+    STATUS_MAP = {
+        '0': (IDLE, ''),
+        '1': (WARN, 'underrange'),
+        '2': (WARN, 'overrange'),
+        '3': (ERROR, 'sensor error'),
+        '4': (ERROR, 'sensor off'),
+        '5': (ERROR, 'no sensor'),
+        '6': (ERROR, 'identification error'),
+    }
+
+    ioClass = IO
+    
+    def read_value(self):
+        reply = self.communicate(f'PR{self.channel}')
+        status, strvalue = reply.split(',')
+        self.status = self.STATUS_MAP.get(status, (ERROR, 'bad status'))
+        return float(strvalue)

frappy_psi/picontrol.py

@@ -0,0 +1,70 @@
+# *****************************************************************************
+# 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:
+#   Markus Zolliker <markus.zolliker@psi.ch>
+#   Jael Celia Lorenzana <jael-celia.lorenzana@psi.ch>
+# *****************************************************************************
+
+"""PI control for furnance"""
+
+import time
+from frappy.core import Writable, Attached, Parameter, FloatRange, Readable, BoolType, ERROR, IDLE
+
+class PI(Writable):
+    input = Attached(Readable, 'the input module')
+    output = Attached(Writable, 'the output module')
+    relais = Attached(Writable, 'the interlock relais')
+    p = Parameter('proportional term', FloatRange(0), readonly=False)
+    i = Parameter('integral term', FloatRange(0), readonly=False)
+    control_active = Parameter('control flag', BoolType(), readonly=False, default=False)
+    value = Parameter(unit='degC')
+    _lastdiff = None
+    _lasttime = 0
+    
+    def doPoll(self):
+        super().doPoll()
+        if not self.control_active:
+            return
+        self.value = self.input.value
+        self.status = IDLE, 'controlling'
+        now = time.time()
+        deltat = min(10, now-self._lasttime)
+        self._lasttime = now
+        diff = self.target - self.value
+        if self.value > 300:
+            self.write_control_active(False)
+            return
+        if self._lastdiff is None:
+            self._lastdiff = diff
+        deltadiff = diff - self._lastdiff
+        self._lastdiff = diff
+        output = self.output.target
+        output += self.p * deltadiff + self.i * deltat * diff
+        if output > 100:
+            output = 100
+        elif output < 0:
+            output = 0
+        self.output.write_target(output)
+        
+    def write_control_active(self, value):
+        if not value:
+            self.output.write_target(0)
+            
+    def write_target(self, value):
+        self.control_active = True
+        self.relais.write_target(1)
+        
+      

frappy_psi/tdkpower.py

@@ -0,0 +1,62 @@
+# *****************************************************************************
+# 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:
+#   Markus Zolliker <markus.zolliker@psi.ch>
+#   Leon Zimmermann <leon.zimmermann@psi.ch>
+# *****************************************************************************
+"""Powersupply TDK-Lambda GEN8-400-1P230"""
+
+from frappy.core import StringIO, Readable, Parameter, FloatRange, Writable, HasIO, BoolType
+
+class IO(StringIO):
+    end_of_line = ('OK\r', '\r')
+    default_settings = {'baudrate': 9600}
+
+    
+class Power(HasIO, Readable):
+    value = Parameter(datatype=FloatRange(0,3300,unit='W'))
+    
+    def read_value(self):
+        reply_volt = self.communicate('MV?')
+        reply_current = self.communicate('MC?')
+        volt = float(reply_volt)
+        current = float(reply_current)
+        return volt*current
+
+    
+class Output(HasIO, Writable):
+    value = Parameter(datatype=FloatRange(0,100,unit='%'))
+    target = Parameter(datatype=FloatRange(0,100,unit='%'))
+    maxvolt = Parameter('voltage at 100%',datatype=FloatRange(0,8,unit='V'),readonly=False)
+    maxcurrent = Parameter('current at 100%',datatype=FloatRange(0,400,unit='A'),readonly=False)
+    output_enable = Parameter('control on/off', BoolType(), readonly=False)
+    
+    def initModule(self):
+        super().initModule()
+        self.write_output_enable(False)
+        
+    def write_target(self, target):
+        self.write_output_enable(target != 0)
+        self.communicate(f'PV {target*self.maxvolt:.5f}')
+        self.communicate(f'PC {target*self.maxcurrent:.5f}')
+        self.value = target
+        
+    def write_output_enable(self, value):
+        self.communicate(f'OUT {int(value)}')
+        
+    def shutdown(self):
+        self.write_target(0)
+