Lakeshore 330 - Display Commands

Lake Shore Model 330 Autotuning Temperature Controller User’s Manual
4-14 Remote Operation
TERM? Terminator Query.
Input: TERM?
Returned: Returns the current terminating character type:
0 = Carriage return and line feed (CR)(LF
EOI
)
1 = Line feed and carriage return (LF)(CR
EOI
)
2 = Line feed (LF
EOI
)
3 = No terminating characters – EOI line set with last data byte if enabled (End)
Remarks: This command works only with the IEEE-488 Interface.
4.3.4 Display Commands
Display commands allow the interface to act as a virtual display. Transfer display data, as well as format.
CCHN Set Control Channel to A or B.
Input: CCHN A, or CCHN B
Returned: Nothing
Remarks: Sets control channel to sensor A or B. Do not combine channel, control unit, and setpoint
changes. Allow one controller update cycle (½ second) between these commands so the
Model 330 interprets them correctly.
Example: CCHN A[term] changes the control channel to A.
CCHN? Control Channel Query.
Input: CCHN?
Returned: A or B
Remarks: Returns the current control channel setting: A = channel A, B = channel B.
CDAT? Control Sensor Data Query.
Input: CDAT?
Returned: ±000.00
Remarks: Returns control sensor data. A free field is active here. The value returned is 7 characters: a
sign, 5 digits and a decimal point. The last digit may be a null.
Example: +1.2345[term] Typical response for a voltage query.
-123.40[term] Typical response for a degrees Celsius query.
+234.50[term] Typical response for a kelvin or degrees Celsius query.
CUNI Set Units for the Control Channel.
Input: CUNI K, CUNI C, or CUNI S
Returned: Nothing
Remarks: Set control channel units: K = kelvin, C = Celsius, S = appropriate sensor units (volts, ohms,
or millivolts).
Example: If operating in kelvin with a Model 330-01, CUNI S[term] makes the units volts – the sensor
units for a diode sensor. The Model 330-02 platinum controller has sensor units of ohms, and
the Model 330-04 thermocouple controller has sensor units of millivolts.
CUNI? Control Units Query.
Input: CUNI?
Returned: K, C, V, R, or M
Remarks: Current control units setting: K = kelvin, C = Celsius, V = volts, R = Ohms, M = millivolts.