Lakeshore 340 - Page 127

Lake Shore Model 340 Temperature Controller User’s Manual
Remote Operation 9-29
COMM? Query Serial Interface Parameters
Input: COMM?
Returned: <terminator>, <bps>, <parity>. Format: n,n,n[term]
Remarks: Returns the serial interface parameter. See COMM command for parameter descriptions.
CRDG? Query Input Celsius Reading
Input: CRDG? <input>
Returned: <Celsius value>. Format: ±nnn.nnnE±n[term]
Remarks: Returns the Celsius reading for an input. <input> specifies which input to query.
CRVDEL Delete User Curve
Input: CRVDEL <curve>
Returned: Nothing
Remarks: Deletes a user curve (see Paragraph 8.1.2). NOTE: Curves are not permanently updated in
the curve Flash until a CRVSAV command is issued. <curve> specifies which curve to
delete. Valid entries: 21 - 60.
Example: CRVDEL 21[term] - Deletes User Curve 21. Use CRVSAV for permanent deletion.
CRVHDR Configure Curve Header
Input: CRVHDR <curve>, [<name>], [<SN>], [<format>], [<limit value>], [<coefficient>]
Returned: Nothing
Remarks: Configures the user curve header (Paragraph 8.1.3). NOTE: Curves are not permanently
updated in the curve FLASH until a CRVSAV command is issued.
<curve> Specifies which curve to configure. Valid entries: 21 - 60.
<name> Specifies curve name. Limited to 15 characters.
<SN> Specifies the curve serial number. Limited to 10 characters.
<format> Specifies the curve data format. Valid entries:
1 = mV / K, 2 = V / K, 3 = Ω / K, 4
= log Ω / K, 5 = log Ω / log K
.
<limit value> Specifies the curve temperature limit in kelvin.
<coefficient> Specifies the curves temperature coefficient. Valid entries: 1 = negative,
2 = positive.
Example: CRVHDR 21, DT-470, 00011134, 2, 325.0, 1[term] - Configures User Curve 21 with a name
of DT-470, serial number of 00011134, data format of volts versus kelvin, upper temperature
limit of 325 K, and negative coefficient.
CRVHDR? Query Curve Header
Input: CRVHDR? <curve>
Returned: <name>, <SN>, <format>, <limit value>, <coefficient>
Format: aaaaaaaaaaaaaaa,aaaaaaaaaa,n,nnn.nnn,n[term]
Remarks: Returns a standard or user curve header. See the CRVHDR command for parameter
descriptions. <curve> specifies which curve to query. Valid entries: 1 - 60.
CRVPT Configure Curve Data Point
Input: CRVPT <curve>, <index>, <units value>, <temp value>
Returned: Nothing
Remarks: Configures a user curve data point (Paragraph 8.1.3). NOTE: Curves are not permanently
updated in the curve Flash until a CRVSAV command is issued.
<curve> Specifies which curve to configure. Valid entries: 21 - 60.
<index> Specifies the points index in the curve. Valid entries: 1 - 200.
<units value> Specifies sensor units for this point to 6 digits.
<temp value> Specifies the corresponding temperature in kelvin for this point to 6 digits.
Example: CRVPT 21, 2, 0.10191, 470.000[term] – Sets User Curve 21 second data point to 0.10191
sensor units and 470.000 K.