Copyright (C) 2009, Digi International

================================================================================
Release Date: April 16, 2009
Release Version: 8x42

+----------------------+
| Firmware Variants    |
+----------------------+
8042 = Module Firmware
28042 = Module Firmware - Australia
8342 = RS485 Adapter Firmware
8742 = Digital IO Adapter Firmware

+----------------------+
| Special Notes        |
+----------------------+
 - The current version of sleep code is not compatible with previous versions.

+----------------------+
| New Features         |
+----------------------+
 - Added module IO support:
   - Analog Inputs
   - Digital Inputs and Outputs
   - PWM outputs
   - IR, IS, IC, and IF commands added for IO sampling.
 - Major rework of sleeping router implementation:
   - Redefined the sleep modes set by the SM command.
   - Sleeping clock drift rate has been reduced.  This reduces the minimum wake time needed.
   - Changed defaults of the SP and ST commands.
   - Added the Sleep Status (SS) command.
   - Added the OS and OW commands.  These commands allow the user to query the operational sleep parameters.
   - A number of options have been added to the sleep option (SO) command.
   - Added the MS and SQ sleep diagnostic commands.
   - Added the Wake Host command.
   - Changes made to sleep parameters now take effect sooner.
   - Added an automatic early wakeup feature to prevent lost synch.
   - Added some API status messages related to sleep.
   - General enhancements improving reliability have been made.
 - Functionality for the Associate LED has been added which integrates its behavior with the modules sleep behavior.
 - Commissioning Button support has been added.
 - Added the CE command which allows nodes to be designated as non-routers.
 - Added the CK command
 - Added support for Australia frequencies.  Changed version numbering to support a country prefix.
 - Removed the NQ command.
 - A new TX Option: suppress route discovery
 - RTS flow control added.

+----------------+
| Bug Fixes      |
+----------------+
 - Some fixes to explicit frames were made.
 - Some bugs in the ND/DN code were fixed.
 - Fixed a bug which caused modules to occasionally reset.
 - Added code so that we don't go to sleep immediately after de-asserting CTS.  We now
   wait for the host to stop sending data before going to sleep.
 - Made it so an ND response will report the device type of the module.
 - There was not a minimum check on ST in place, it has been added.
 - Added fix for NH limiting RREQ broadcasts.
 - Fixed problem where a TX packet that was too big would not return a TxStatus failure.
 - Added the SB (stop bits) command.
 - Bounds checking added to the GT and NT commands
 - Made NI strings case sensitive in all places.
 - Fixed problem where transparent data would occassionally get sent as 2 packets when only one was necessary.
 - Fixed bug where a DN with an unknown string wouldn't return an error in API mode.
 - Fixed bug where a txRequest packet with 0 payload would return a response.
 - The version number was not reported correctly on the DIO and AIO adapters.
 - Fixed bug where resets or strange behavior whould occur when multiple
   ND requests were made on a node set to self-respond to ND requests.

+-----------------------------------+
| Known Issues / Errata             |
+-----------------------------------+
 - Changes to SP or ST on an unsynchronized radio will not take effect.
 - IO lines configured as digital inputs with the pullup enabled the voltage of the IO line will stabilize somewhere
   between (Vcc-.65V) and (Vcc-.45V).  This can cause leakage of up to 45uA per pin.
 - RSSI reporting is only accurate when the signal strength is less than (approximately) -85dBm.


================================================================================
Release Date: April 22, 2008
Release Version: 1820

- Initial Release