Lake Shore Model 321 Autotuning Temperature Controller User’s Manual
Remote Operation
4-17
Curve Commands
(Continued)
CUID?
Curve Identification Query.
Input:
CUID?
Returned:
WW,XXXXXXXXXXXXXXXXXX,Y,ZZ,...
Remarks:
Returns the header lines that identify the curves (standard sensor and user
curve) loaded into each curve location. The information lines for the user curve
will only be available if it is actually present. Information returned is defined as
follows:
W = Curve number:
The value given here will be 00 through 11.
X = Curve description: 18 character information line. All 18 character spaces
do not have to be used.
Y = Temp. coefficient: N represents a negative temperature coefficient, while
P represents a positive one.
Z = Number of points: This value will be the number of points for that particular
curve (usually 31, but can be up to 99).
Example:
00, STANDARD DRC-D ,N,31,
01, STANDARD DRC-E1,N,31,
02, STANDARD CRV 10,N,31,
03, STANDARD DIN-PT,P,31,
etc.
CURV11
Initiate User Curve.
Input:
CURV 11,SB0CCCCCCCCCCCCCCC,D.DDDDD,EEE.E,Y.YYYYY,ZZZ.Z*
Returned:
Nothing
Note:
Due to the limited 256 character buffer used by the serial interface, an entire
curve cannot be loaded at once. The CURV11 command should be used to enter
the first two points and then the ECUR11 command to add the remaining points
one at a time up to a maximum of 97 points.
Remarks:
This command is used to establish and enter the first two points of the user curve
in the following format:
S = For the Model 330, the first character must be the letter “S.”
B = Setpoint Limit, where 0 = 325 K, 1 = 375 K, 2 = 475 K, 3 = 800 K, and
9 = 999 K. The 9 should be used for all thermocouples.
0 = For the Model 321, the third character should be the number “0” for all
sensors except thermocouples where the number should be “9.’
C = 15 characters for curve description. Must be at least 1 character. More
than 15 characters will be ignored.
D = First voltage or resistance (lowest units value).
E = First
temperature.
Y = Last voltage or resistance (highest units value).
Z = Last
temperature.
The data points are input with the units value first. This value will be voltage or
R
equiv
. The value will have one character before the decimal place and five after it
(0.00000). The table below gives the conversion of raw units into the format
required. The Model 321 automatically fills in leading and trailing zeros.
The second value is the temperature. It has three character spaces before the
decimal point and one after it (000.0). After both points are input, placement of an
“*” terminates the sensor curve input.
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