Thorlabs ITC4000 series laser diode and temperature controller firmware
This firmware is a device internal program for ITC4000 series instruments. For installation instructions please consult the user’s manual.

Software needed for upload:
Thorlabs Device Firmware Upgrade Wizard

Change log:
Apr-29-2022   V2.3.5
•	QCW pulse generation extern triggered now up to real 1 kHz possible

Mar-14-2022   V2.3.3
•	Display contrast range adapted to new displays with RA8835 processor

Feb-28-2022   V2.3.2
•	Display timing better adapted to new display WO320240D with RA8835 processor

Jan-13-2022   V2.3.1
•	Contrast range better adapted to new display WO320240D with RA8835 processor

Jan-10-2022   V2.3.0
•	Adapted to new display with RA8835 processor

Jun-23-2021 	V2.2.0
•	Avoids QCW pulse jitter

Jun-14-2018 	V2.1.0 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 	V2.0.0 with DTC V2.6.0
•	Thermistor temperature range enlarged to -150 °C to +150 °C
•	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”.

Apr-10-2018 	V1.9.0
•	Avoids firmware hang-up in special cases

Apr-15-2015 	V1.8.0
•	Support for Flash AT25DN512C added

Nov-06-2013 	V1.7.0
•	Support for LDC board rev. -500.

Feb-06-2013 	V1.6.0
•	Keyboard controller firmware update. Digital temperature controller firmware update.

Dec-12-2012 	V1.5.0
•	Support for LD output noise reduction filter added. 
•	SCPI command parser had problem interpreting nonstandard temperature units. This is fixed.
•	SCPI command list inconsistencies fixed.

Feb-11-2010 	V1.4.0
•	Setting of constant power feedback loop speed unstable. This is fixed.

Feb-05-2010 	V1.3.0
•	Problems with DDS signal generator could result in spurious malfunction of internal modulation circuit. This is fixed.

Feb-02-2010 	V1.2.0
•	Thermistor sensor input amplifier calculations modified.

Jan-29-2010 	V1.1.0
•	Refined adjustment for thermistor sensor measurements.

Jan-22-2010 	V1.0.0
•	Initial release.