Emulation Modes; Emulation Mode Configuration - Lakeshore 335 User Manual

5.11 Emulation
Modes
5.11.1 Emulation Mode
Configuration
You can check the new curve using the Edit Curve instructions in section 5.9.2. The
curve is not automatically assigned to any input, so you will need to assign the new
curve to an input. Refer to section 4.4.7 for details on assigning a curve to a sensor
input.
Menu Navigation:
Curve Entry QSelect FunctionQSoftcal (DT-470, Platinum 100,
Platinum 1000)QData Entry (see note below)Q(Generate Softcal) (Yes)
Interface Command: SCAL
Data entry includes user curve location, new curve serial number, and calibration points.
To provide compatibility with pre-existing software that was written to work with a
Model 331 or a Model 332, the Model 335 can be configured to emulate the remote
interface of these previous model temperature controllers. These emulation modes
allow a Model 335 to replace a Model 331 or Model 332 in a software controlled sys-
tem with very little effort, and very little downtime.
To assist in the ease of replacing a Model 331 or a Model 332 with a Model 335, cer-
tain hardware settings are automatically configured when the Emulation mode is set
to Model 331 or Model 332.
Both emulation modes will trigger the heater resistance setting on Output 1 to be
configured to the 50 ) setting, which will also limit the max current setting to 1 A.
This setting matches the hardware capabilities of the previous model temperature
controllers.
The Model 331 Emulation mode will trigger the output type setting for Output 2 to be
configured to Voltage, because the voltage output on the Model 335 exactly matches
the hardware capabilities of the Loop 2 output on the Model 331.
The Model 332 emulation mode will trigger the output type setting for Output 2 to be
configured to Current. This does not provide an exact match of the Model 332 hard-
ware, as the Loop 2 output on the Model 332 is actually a ±10 V voltage source out-
put. However, the maximum current draw of 1 A on Loop 2 of the Model 332 is
reached at full scale output when using a 10 ) heater, providing 10 W of heater
power, and the Output 2 current source on the Model 335 is also capable of providing
1 A of current into a 10 ) heater at full scale. So applications using a 10 ) heater on
Output 2 will work the same using a Model 335 in current mode as they did when
using the Model 332.
The settings that are automatically configured can be changed manually after configur-
ing the Emulation mode if so desired.
The PID Scaling mode and baud rate settings are not automatically configured when
the Emulation mode is configured to Model 331 or Model 332. These settings must be
manually configured to meet your application needs. Note that the PID Scaling mode
and baud rate will be returned to the default state, and will not be configurable, when
the Emulation mode is set to None. Refer to section 5.11.4 for information on the PID
Scaling mode, and section 5.11.5 for information on the Baud Rate setting.

5.11 Emulation Modes

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