diff --git a/frappy_psi/ls372.py b/frappy_psi/ls372.py
index ce9d6c7..c8216a8 100644
--- a/frappy_psi/ls372.py
+++ b/frappy_psi/ls372.py
@@ -31,6 +31,7 @@ import frappy.io
 from frappy.datatypes import BoolType, EnumType, FloatRange, IntRange
 from frappy.lib import formatStatusBits
 from frappy.core import Command, Drivable, Parameter, Property, CommonReadHandler, CommonWriteHandler
+from frappy.extparams import StructParam
 from frappy_psi.convergence import HasConvergence
 from frappy_psi.channelswitcher import Channel, ChannelSwitcher
 
@@ -215,7 +216,7 @@ class ResChannel(Channel):
     def change(self, command, *args):
         cmd, _, qarg = command.partition(' ')
         args = ','.join([qarg] + [f'{a:g}' for a in args])
-        return parse(self.switcher.communicate(f'{command}?{qarg};{command} {args}'))
+        return parse(self.switcher.communicate(f'{cmd} {args};{cmd}?{qarg}'))
 
     def read_status(self):
         if not self.enabled:
@@ -360,7 +361,6 @@ class ResChannel(Channel):
         return settle
 
 
-
 class TemperatureChannel(ResChannel):
     raw = Parameter('raw reistance value', FloatRange(unit='Ohm'))
     value = Parameter('temperature sensor', FloatRange(0, unit='K'))
@@ -384,6 +384,12 @@ class TemperatureLoop(HasConvergence, TemperatureChannel, Drivable):
     minheater = Parameter('minimal heater current', FloatRange(0, 0.01, unit='A'), readonly=False, default=0)
     HTRRNG = {n: i for i, n in enumerate(['off', '30uA', '100uA', '300uA', '1mA', '3mA', '10mA', '30mA', '100mA'])}
     htrrng = Parameter('', EnumType(HTRRNG), readonly=False)
+    ctrlpars = StructParam('control parameters struct', {
+        'p': Parameter('proportional heat parameter', FloatRange()),
+        'i': Parameter('integral heat parameter', FloatRange()),
+        'd': Parameter('derivative heat parameter', FloatRange()),
+    }, readonly=False)
+
     _control_active = False
 
     def doPoll(self):
@@ -440,10 +446,10 @@ class TemperatureLoop(HasConvergence, TemperatureChannel, Drivable):
         self.communicate(f'SETP {self.loop},{target};*OPC?')
         return target
 
-    #def write_ctrlpars(self, ctrlpars):
-    #    p, i, d = self.change(f'PID {self.loop}', ctrlpars['p'], ctrlpars['i'], ctrlpars['d'])
-    #    return {'p': p, 'i': i, 'd': d}
+    def write_ctrlpars(self, ctrlpars):
+        p, i, d = self.change(f'PID {self.loop}', ctrlpars['p'], ctrlpars['i'], ctrlpars['d'])
+        return {'p': p, 'i': i, 'd': d}
 
-    #def read_ctrlpars(self):
-    #    p, i, d = self.query(f'PID? {self.loop}')
-    #    return {'p': p, 'i': i, 'd': d}
+    def read_ctrlpars(self):
+        p, i, d = self.query(f'PID?{self.loop}')
+        return {'p': p, 'i': i, 'd': d}