Thorlabs TED4000 series temperature controller firmware
This firmware is a device internal program for TED4000 series instruments. For installation instructions please consult the user’s manual.

Software needed for upload:
Thorlabs Device Firmware Upgrade Wizard

Change log:
Mar-14-2022   V2.9.3
•	Display contrast range adapted to new displays with RA8835 processor

Feb-28-2022   V2.9.2
•	Display timing better adapted to new display WO320240D with RA8835 processor

Jan-13-2022   V2.9.1
•	Contrast range better adapted to new display WO320240D with RA8835 processor

Jan-10-2022   V2.9.0
•	Adapted to new display with RA8835 processor

Jun-14-2018 	V2.8.0 with DTC V2.6.0
•	After Auto-PID TEC state is restored to the state before Auto-PID (TEC stays ON if it was ON)

May-25-2018 	V2.7.0 with DTC V2.6.0
•	More thermistor parameter sets usable.
•	Avoids bad temperature ranges in special cases of thermistor parameters.
•	Guaranties reserve from temperature set range to temperature measurement range at temperature control for all possible thermistor parameter sets.
•	Shows real measurement values if temperature is outside the possible temperature set range (using temperature control reserve) instead of showing “Underflow” or “Overflow”.

May-03-2018 	V2.6.0 with DTC V2.5.0
•	Thermistor temperature range enlarged to -150 °C to +150 °C

Apr-10-2018 	V2.5.0
•	Avoids firmware hang-up in special cases

Feb-06-2013 	V2.4.0
•	Keyboard controller firmware update. Digital temperature controller firmware update.

Dec-12-2012 	V2.3.0
•	SCPI command parser had problem interpreting nonstandard temperature units. This is fixed.
•	SCPI command list inconsistencies fixed.

Feb-02-2010 	V2.2.0
•	Thermistor sensor input amplifier calculations modified.

Jan-29-2010 	V2.1.0
•	Refined adjustment for thermistor sensor measurements.

Jan-22-2010 	V2.0.0
•	Major improvements in graphical user interface.
•	Changes and cleanups in SCPI command tree.
•	Window protection error bit in the instrument's status structure was not set on power-up. This is fixed.
•	Default values for factory adjustment modified.
•	Order of error checking changed when switching the TEC output on.
•	Temperature sensor offset was not calculated correctly for sensor dependent temperature ranges. This is fixed.
•	Reference voltage for thermistor measurements stored in nonvolatile memory now.

Jan-15-2009 	V1.3.0
•	Display ESD recovery timing changed.

Dec-22-2008 	V1.2.0
•	Display malfunction after electrostatic discharges. A cyclic check for proper display function was added.

Dec-12-2008 	V1.1.0
•	Minor bug fixes and improvements.

Nov-14-2008 	V1.0.0
•	Initial release.