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L4400A Firmware Revision History

Changes from 2.43 to 2.51

  • Web admin GUI modified to work with browsers running Java 8. Java 8 required signatures for improved security. Users must update their browser Java to version 8. If the user can't update to Java 8, then they must use the previous firmware

Changes from 2.41 to 2.43

  • L4450A: Fixed reset routines (*rst, syst:cpon) to allow handshaking to be reset correctly
  • WebUI: Increased size of the buffer for HTTP headers (occasionally refusing connections from certain hosts)

Unit firmware changes:

  • L4421A (1.20 to 1.21)
    - Critical defect fix: modified temperature sensor read routines to eliminate the 'internal error 10' race condition that was introduced during the upgrade to mainframe rev 2.41.
  • L4433A (1.14)
  • L4437A (2.10)
  • L4445A and 34945EXT (1.40)
  • L4450A (2.30)
  • L4451A (2.16 to 2.17)
    - Trigger out output signal was not being disabled correctly and was always driving the output.
  • L4452A (2.10)

Changes from 2.33 to 2.41

  • Fixed internal state machine timer to account for worst case interrupt jitter when scheduling events
    - In rare cases an interval scan could get delayed in time by ~3 minutes because reloading the hardware timer was interrupted just as the scan interval expired.

Unit firmware changes:

  • L4421A (1.18 to 1.20): Fixed temperature reference measurements:
    - Repaired defect related to a loss of resolution on the temperature reference junction (LSBs no longer set to 0).
    - Increased number of samples over which reference temperature is averaged.
    - Fixed defect where a negative reference value failed to invert the fractional part of the reading, causing it to be off by as much as 1 deg C for temperatures < 0.
  • L4433A (1.13 to 1.14)
  • L4437A (2.09 to 2.10)
  • L4445A and 34945EXT (1.39 to 1.40): Fixed defect on the 34945EXT that could cause unrecoverable firmware if power is lost during a firmware update.
  • L4450A (2.30)
  • L4451A (2.16)
  • L4452A (2.10)

Changes from 2.25 to 2.33

  • Added support for new generation of microprocessor on units shipped after June 1, 2008

Unit firmware changes:

  • L4421A (1.17 to 1.18): added support for new generation of microprocessor
  • L4433A (1.12 to 1.13): added support for new generation of microprocessor
  • L4437A (2.08 to 2.09): added support for new generation of microprocessor
  • L4445A (1.28 to 1.39): added support for new generation of microprocessor
    improved power supply overvoltage detection
  • 34945EXT (1.28 to 1.39): added support for new generation of microprocessor
    improved power supply overvoltage detection
  • L4450A (2.29 to 2.30): added support for new generation of microprocessor
  • L4451A (2.15 to 2.16): added support for new generation of microprocessor
  • L4452A (2.09 to 2.10): added support for new generation of microprocessor

Changes from Revision 1.00 to 2.25:

  • L4445A: Corrected race condition that could cause an unintentional flash memory erase at boot
    - 34945EXT has its own firmware. It's recommended that 34945EXT be updated with the L4445A as well to not experience conflicting firmware issues.
  • L4400A: Fixed *RCL of analog bus states in 4-wire RTD mode
  • L4400A: The sequence form of SOURCE:DIG:DATA no longer defaults to BYTE width. It is now using the currently selected channel width
  • L4400A: Removed vulnerability that made it possible to short modules together by updating the monitor channel while waiting for a scan trigger

Revision 1.00 – Initial release

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