Lake Shore 350, User Manual

Page: 170 / 192

156 c
HAPTER
6: Computer Interface Operation
Model 350 Temperature Controller
SRDG? Sensor Units Input Reading Query
Input
SRDG? <input>[term]
Format a
<input>
Specifies which input to query: A - D

(D1 - D5 for 3062 option).
Returned <sensor units value>[term]
Format ±nnnnnn
Remarks Also see the RDGST? command.
TEMP? Thermocouple Junction Temperature Query
Input
TEMP?[term]
Returned <junction temperature>[term]
Format +nnnnn
Remarks Temperature is in kelvin. This query returns the temperature of the ceramic thermo-
couple block used in the room temperature compensation calculation
TLIMIT Temperature Limit Command
Input
TLIMIT <input>,<limit>[term]
Format a,+nnnn
<input>
Specifies which input to configure: A - D

(D1 - D5 for 3062 option).
<limit> The temperature limit in kelvin for which to shut down all

control outputs when exceeded. A temperature limit of zero

turns the temperature limit feature off for the given

sensor input.
Example TLIMIT B,450[term] —if the temperature of the sensor on Input B exceeds 450 K, all
control outputs will be turned off.
Remarks A temperature limit setting of 0 K turns the temperature limit feature off.
TLIMIT? Temperature Limit Query
Input
TLIMIT? <input>[term]
Format a
<input>
Specifies which input to query: A - D

(D1 - D5 for 3062 option).
Returned < limit>[term]
Format +nnnn (refer to command for description)
TUNEST? Control Tuning Status Query
Input
TUNEST?[term]
Returned <tuning status>,<output>,<error status>,<stage status>[term]
Format n,n,n,nn
<tuning status>
0 = no active tuning, 1 = active tuning.
<output> Heater output of the control loop being tuned (if tuning):

1 = output 1, 2 = output 2, 3 = output 3, 4 = output 4
<error status> 0 = no tuning error, 1 = tuning error
<stage status> Specifies the current stage in the Autotune process.

If tuning error occurred, stage status represents stage

that failed.
Remarks If initial conditions are not met when starting the autotune procedure, causing the
autotuning process to never actually begin, then the error status will be set to 1 and
the stage status will be stage 00.