Version history file for 2014 released power supply series 
PS 9000 1U
PS 9000 2U
PS 9000 3U

Meaning of the symbols:
+ Feature added
- Feature or bug removed (general bug fixes are not listed to have a better overview)
* Feature changed

Note: according to the block diagram in the manual, these devices have three microprocessor controlled components which have separate firmwares. 
They are listed below in separate sections.
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Component KE:
v2.01
* First KE firmware release

v2.03
* Improved the USB SCPI/ModBus communication

v2.04
+ Remote activation/deactivation of the communication protocols

v2.06
+ Remotely adjustable Ethernet timeout

v2.07
+ Improved analog interface sample rate to 500 Hz

v3.01
+ Added keep-alive functionality for the Ethernet port (register 10007 resp. SCPI command SYSTem:COMMunicate:LAN:KEEPalive)

v3.04
- Fixed but related to SCPI command SOURce:POWer MAX

v3.06
+ SCPI: added sending termination character LF (line feed, 0xA) to all messages
* Ethernet: TCP keep-alive time set to standard 2h
+ OT: added setting to determine whether the DC output shall be off after an OT alarm or continue
+ ModBus TCP: the internal Ethernet port now supports ModBus TCP via port 502, ignoring the Ethernet port setting where the default is 5025 (means, the port doesn't require to be set to 502, it's also not possible)
- Removed a bug where the system would hang when the ModBus protocol is disabled, but the device receives a ModBus message

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Component KE for GPIB models:
v2.02
- Fixed bug with command SYST:LOCK over GPIB where it was not executed as expected

v2.03
- Some small bug fixes

v2.04
- Settings storage problem fixed
+ Alarm Power Fail (PF) indicated along with OverTemperature (OT) on pin 6 of analog interface
- GPIB address: Fixed bug where the address could be set to 31 via USB command
- SCPI: removed some CAN interface related commands from list of supported commands
* Improved performance on GPIB

v2.08
+ Analog interface pins 6, 14 and 15 can now be configured to signal various statuses

v2.09
+ SCPI: Support for leading colon

v2.10
+ OT: added setting to determine whether the DC output shall be off after an OT alarm or continue
- Removed a bug where the system would hang when the ModBus protocol is disabled, but the device receives a ModBus message

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Component HMI (with blue LCD, discontinued):
v2.01
* First HMI firmware release for PS 9000 2U/3U models 

v2.02
+ Alarm history menu, "Analog interface Rem-SB" and "Analog Rem-SB action" settings
* Improved device calibration

v2.03
+ "DC output after PF alarm", manual or remote activation/deactivation of the communication protocols, USB timeout settings, 
- Voltage controller speed setting
* "General-Settings" arrangement

v2.04
+ Manually adjustable Ethernet timeout, HMI PIN lock, user text now displayed on "About HW, SW" screen

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Component HMI (with color TFT):
v2.01 (first official release)

v2.02
- Removed bug which caused the power LED on the front to stay orange after boot

v2.03
+ Added new setting "DC output after OT alarm"
+ Analog interface pins 6, 14 and 15 can now be configured to signal various statuses (this also requires to update the KE firmware to 3.05 or higher)
* Ethernet: the Ethernet timeout is not forcibly set to 0 when activating "TCP keep-alive"

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Component DR:
v1.0.15
* First DR firmware release

v1.0.16
* Improved the supervision functions, measurement functions

v1.0.17
* Improved the supervision functions

v1.0.18
* Improved device calibration and the supervision functions

v1.0.21
* Bugfix: Power fail alarms were not displayed after the start of the device and when being already present during the start