Lake Shore Model 321 Autotuning Temperature Controller User’s Manual
4-12
Remote Operation
4.2.2 Control Process Commands
This paragraph provides a detailed description of each Control Process Command. These commands
allow the interface to change any of the control parameters of the Model 321. Manual mode PID
parameters are accessible as well as Autotuning status.
TUNE
Sets Autotuning Status.
Input:
TUNE X
Returned:
Nothing
Remarks:
Set Autotuning status as follows: 0 = Manual, 1 = P, 2 = PI, and 3 = PID. Refer to
Paragraph 4.1 for further information on Autotuning settings.
TUNE?
Autotuning
Query.
Input:
TUNE?
Returned:
X
Remarks:
Returns current Autotuning status where 0 = Manual, 1 = P, 2 = PI, and 3 = PID.
Refer to Paragraph 4.1 for further information on Autotuning settings.
SETP
Sets Setpoint In Units Chosen For Control.
Input:
SETP XXX.X
for temperature, or
SETP X.XXXX
for voltage
Returned:
Nothing
Remarks:
Fill in the setpoint parameter with a value from 0 through 999.9 for temperature
or 0 through 2.499 for voltage. Utilizes the free field format for the decimal point.
Example:
If in kelvin:
1.
SETP 77.2[term]
will result in the display showing 77.2 K.
2.
SETP 123[term]
will result in the display showing 123.0 K.
If in Celsius:
3.
SETP -123[term]
will result in the display showing –123.0 C.
4.
SETP 123.456[term]
will result in the display showing 123.4 C.
SETP?
Setpoint Status Query.
Input:
SETP?
Returned:
±XXX.X
for temperature, or
±X.XXXX
for voltage
Remarks:
Returns current set point setting. The value returned will be 6 digits (a sign,
4 digits, and a decimal point).
Example:
If using the examples above in the SETP command discussion—if in kelvin:
1.
SETP?[term]
will return
+077.2 [term]
.
2.
SETP?[term]
will return
+123.0 [term]
.
If in Celsius:
3.
SETP?[term]
will return
-123.0 [term]
.
4.
SETP?[term]
will return
+123.4 [term]
.
