Galileo HIC Standard Formatted Data Units (SFDU)

The following table illustrates the block structure of the Heavy Ion Counter SFDUs:

SFDU Label
"NJPL2I00XXX"		 12 bytes
Length of SFDU 8 bytes
Subheader Aggregation CHDO type code 2 bytes
Length of Aggregated Subheaders = L2 2 bytes
Primary Header CHDO type code 2 bytes
Length of Primary Header = L3 2 bytes
Primary Header Data 4 bytes
Secondary Header CHDO type code 2 bytes
Secondary Header Length = L4 2 bytes
Secondary Header Data 56 bytes
Tertiary Header CHDO type code 2 bytes
Tertiary Header Length = L5 2 bytes
Tertiary Header Data 42 bytes
Data Block CHDO type code 2 bytes
Length of Data Block 2 bytes
Data Block 142 bytes

Total Length: 284 bytes

NOTE: In HIC SFDUs there is no quaternary subheader.

The original SFDU technical documentation from JPL and Betsy Wilson is available here.

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Last Revised: Tuesday 22 April, 1997