Unsupported Commands; Command Interpretation; Pid Scaling Mode; Baud Rate - Lakeshore 335 User Manual

86 c 5: Advanced Operation
HAPTER
5.11.2 Unsupported
Commands
5.11.3 Command
Interpretation
5.11.4 PID Scaling
Mode

5.11.5 Baud Rate

Model 335 Temperature Controller
Some commands are not supported in the Model 335, regardless of the emulation
mode, as the associated functions are no longer included. Although these commands
are unsupported, a properly formatted reply will be sent when these queries are
received to prevent locking up or crashing software that was written to query this
information. These unsupported commands are:
LDAT
D
LINEAR
D
MNMX
D
Except for the unsupported commands above, when the Model 335 is in the proper
emulation mode, it will interpret all Model 331 and Model 332 commands. Each
command will either be interpreted directly, or it will be translated to the most
appropriate Model 335 setting, for full compatibility with the Model 331 or the
Model 332. Some settings will not directly apply to the Model 335, such as the Auto-
tune control modes. Attempts to set an inapplicable setting will be ignored.
As a reference, the following commands are interpreted differently depending on the
emulation mode setting:
HTR
D
HTRST
D
RANGE
D
ANALOG
D
DISPFLD
D
IEEE
D
TUNEST
D
INTYPE
D
ZONE
D
The Model 335 must be configured to the appropriate emulation mode in order for
the commands to be interpreted correctly.
The PID Scaling mode determines whether the Model 335 emulates the control scal-
ing of the Model 331 and Model 332. In the Model 331 and Model 332, temperature
control is calculated using sensor units. Sensor units can cause the control response
to be non-linear across temperature ranges if the sensor's temperature response
curve is non-linear. Using units of temperature in the PID control algorithm allows
the control response to be linear throughout all temperatures, leaving only the non-
linearities in the system to require new PID values. Therefore, we recommend that
you set the PID Scaling mode to 335.
Menu Navigation:
Interface Q Emulation Mode (Model 331, Model 332)
ENTER
(335, 331/332)
Interface Command: EMUL
Models 331 and 332 only supported baud rates of 300, 1200, and 9600. When not
configured for Model 331 or Model 332 emulation, the Model 335 only supports a
baud rate of 57600. However, in Model 331 or Model 332 Emulation mode, the baud
rate setting becomes available for configuring values of 300, 1200, 9600, or 57600.
When changing the Emulation mode back to None, the baud rate setting is returned
to the Model 335 default, and the non-configurable value of 57600.
Menu Navigation:
Interface QEmulation Mode (Model 331, Model 332)
ENTER
9600, 1200, 300)
Interface Command: BAUD
Q PID Scaling
ENTER
QBaud Rate(57600,
ENTER