Control Process Commands - Lakeshore 330 User Manual

Lake Shore Model 330 Autotuning Temperature Controller User's Manual
4.3.5

Control Process Commands

Control Process Commands allow the interface to change any of the Model 330 control parameters. Access
Manual mode PID parameters as well as Autotuning status.
CLIM
Set Control Limit Band for Control Sensor.
Input:
CLIM XXX.X
Returned: Nothing
Remarks: Sets the control limit band for the control sensor. Enter a value from 0 to 999.9. Used in
conjunction with the Service Request function. It utilizes the free field format. See the Status
Byte Register and the Control Limit Exceeded Bit (Bit 2) discussions.
Example: CLIM 1.25[term] results in a control limit of 1.25 K or °C.
CLIM?
Control Limit Query.
Input:
CLIM?
Returned: XXX.X (a number from 0 to 999.9)
Remarks: Returns the control limit setting.
Example: The example above in the CLIM command returns 001.25[term].
GAIN
Set Gain While In Manual Control Mode.
Input:
GAIN XXX
Returned: Nothing
Remarks: Enter an integer from 0 to 999.
Example: GAIN 65 [term] instructs the Model 330 to set control gain to 65. Gain corresponds to the
Proportional (P) portion of the PID Autotuning control algorithm.
GAIN?
Gain Query.
Input:
GAIN?
Returned: XXX (Integer from 000 to 999)
Remarks: Returns current gain setting in manual or AutoTune mode. Gain corresponds to the
Proportional (P) portion of the PID Autotuning control algorithm.
HEAT?
Heater Power Status Query.
Input:
HEAT?
Returned: XXX
Remarks: Returns the percent of full scale heater current. The returned number represents five percent
increments up to 100.
RAMP
Enable/Disable Ramp Function.
Input: RAMP 0 or RAMP 1
Returned: Nothing
Remarks: RAMP 0 disables the ramping function while RAMP 1 enables ramping.
RAMP?
Ramping Enable/Disable Status Query.
Input:
RAMP?
Returned: 0 or 1
Remarks: Returns Ramp status: 0 = ramping function disabled, 1 = ramping function enabled.
4-16 Remote Operation