DekTec DTM-3200 User Manual page 5

DTM-3200 – OEM Ethernet TSoIP Converter
User Manual
1.0 2010.03.31 Initial release to the field
the DTM-3200 to become unresponsive
 DTM-3200 does not generate an I2C error response when an incorrect
command has been issued
 DIP switches #3 and #4 have no effect when used to set I2C slave address
 An I2C master has to wait at least 10ms between issuing a command and trying
to read the response
Changes affecting customer design:
 The I2C read behavior has changed: The DTM-3200 will always acknowledge
its address when a read-cycle is initiated. When there is no data available to
return to the master, zeroes will be returned. This also means that zeroes are
appended to a message when the master reads more bytes than available
 The firmware update ASCII encoding (does not apply to I2C) has been altered
and is incompatible with previous versions, including older failsafe firmware
 Enabling the DHCP client by writing an IP address with value 0.0.0.0 is no
longer supported. Writing 0.0.0.0 will result in an error-response, since it is an
incorrect fixed IP address. The user should use the DHCP-enable setting instead
 Every message sent by the DTM-3200 on the RS-XXX port now uses uppercase
ASCII characters. Users checking for lowercase characters should change this to
uppercase. e.g. "3A" instead of "3a", "R" instead of "r"
Other changes:
 Added 'VBR' mode, category 0x81, setting 0x16, data 0x03
 Changed behavior of the DHCP enable setting (category 0x03, setting 0x04)
 Added 'Volatile Storage' setting (category 0x02, setting 0x03), giving the user the
option to choose between RAM or FLASH storage of settings
 Added checking for 'r' and 'R' in the read/write-field of a command message.
Previously any character other than 'w' or 'W' would result in a read reply
 Added protocol checks for incorrect settings; these will result in an 'E' reply
 Removed automatic reboot at the end of the firmware update process
 Firmware update speed has been improved, compressed programming files are
now supported and ASCII encoding has been altered
 MPEG null packets (PID 8191) are now ignored when scanning for PCRs, to
prevent incorrect detection of PCRs resulting in lock errors
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