Lake Shore 350, User Manual

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6.6.1 Interface Commands 153
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PID Control Loop PID Values Command
Input
PID <output>,<P value>,<I value>,<D value>[term]
Format n,+nnnnn,+nnnnn,+nnnn
<output>
Specifies which output’s control loop to configure: 1 – 4.
<P value> The value for output Proportional (gain): 0.1 to 1000.
<I value> The value for output Integral (reset): 0.1 to 1000.
<D value> The value for output Derivative (rate): 0 to 200.
Remarks Control settings, (P, I, D, and Setpoint) are assigned to outputs, which results in the
settings being applied to any loop formed by the output and its control input.
Example PID 1,10,50,0[term] —Output 1 P is 10, I is 50, and D is 0%.
PID? Control Loop PID Values Query
Input
PID? <output>[term]
Format n
<output>
Specifies which output’s control loop to query: 1 – 4.
Returned <P value>,<I value>,<D value>[term]
Format +nnnnn,+nnnnn,+nnnn (refer to command for description)
RAMP Control Setpoint Ramp Parameter Command
Input
RAMP <output>,<off/on>,<rate value>[term]
Format n,n,nnnn
<output>
Specifies which output’s control loop to configure: 1 – 4.
<off/on> Specifies whether ramping is 0 = Off or 1 = On.
<rate value> Specifies setpoint ramp rate in kelvin per minute from

0.1 to 100. The rate is always positive, but will respond to

ramps up or down. A rate of 0 is interpreted as infinite, and

will therefore respond as if setpoint ramping were off.
Example RAMP 1,1,10.5[term] —when Output 1 setpoint is changed, ramp the current set-
point to the target setpoint at 10.5 K/minute.
Remarks Control loop settings are assigned to outputs, which results in the settings being
applied to the control loop formed by the output and its control input.
RAMP? Control Setpoint Ramp Parameter Query
Input
RAMP? <output>[term]
Format n
<output>
Specifies which output’s control loop to query: 1 – 4.
Returned <off/on>,<rate value>[term]
Format n,nnnn (refer to command for description)
RAMPST? Control Setpoint Ramp Status Query
Input
RAMPST? <output>[term]
Format n
<output>
Specifies which output’s control loop to query: 1 – 4.
Returned <ramp status>[term]
Format n
<ramp status>
0 = Not ramping, 1 = Setpoint is ramping.