Tutorial/Source/vclamp.xml

<Lems xmlns="http://www.neuroml.org/lems/0.7.4"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.neuroml.org/lems/0.7.4 ../../LEMS/Schemas/LEMS/LEMS_v0.7.4.xsd"
      description="New voltage clamp">


    <ComponentType name="voltageClamp2" extends="baseVoltageDepPointCurrent"
                   description="Voltage clamp. Applies a variable current _i to try to keep parent at _targetVoltage. ">

        <Parameter name="delay" dimension="time" description="Delay before switching from conditioningVoltage to testingVoltage."/>
        <Parameter name="duration" dimension="time" description="Duration to hold at testingVoltage."/>
        <Parameter name="conditioningVoltage" dimension="voltage" description="Target voltage before time delay"/>
        <Parameter name="testingVoltage" dimension="voltage" description="Target voltage between times delay and delay + duration"/>
        <Parameter name="returnVoltage" dimension="voltage" description="Target voltage after time duration"/>
        
        <!-- seriesResistance renamed to simpleSeriesResistance & factor of 1e-5 removed from calculation of current. Still being tested... -->
        <Parameter name="simpleSeriesResistance" dimension="resistance" description="Current will be calculated by the difference in voltage between the target and parent, divided by this value"/>

        <!--TODO: remove! Only required as EventConnection is used in explicitInput to
        connect inputs to cells. Events aren't passed! ... -->
        <EventPort name="in" direction="in" description="Note this is not used here. Will be removed in future"/>

        <Dynamics>

            <StateVariable name="i" exposure="i" dimension="current"/>

            <OnEvent port="in"><!--TODO: remove, see above...
            <StateAssignment variable="i" value="0"/>-->
            </OnEvent>

            <OnCondition test="t .lt. delay">
                <StateAssignment variable="i" value="(conditioningVoltage - v) / simpleSeriesResistance"/>
            </OnCondition>

            <OnCondition test="t .geq. delay">
                <StateAssignment variable="i" value="(testingVoltage - v) / simpleSeriesResistance"/>
            </OnCondition>

            <OnCondition test="t .gt. duration + delay">
                <StateAssignment variable="i" value="(returnVoltage - v) / simpleSeriesResistance"/>
            </OnCondition>

        </Dynamics>

    </ComponentType>
    
    
    <voltageClamp2 id="vClamp" delay="10ms" duration="30ms"
              conditioningVoltage="-63.77mV" 
              testingVoltage="10mV" 
              returnVoltage="-63.77mV" 
              simpleSeriesResistance="1e4ohm"/>
    
</Lems>