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 by JPL and Betsy Wilson.

Last Revised: Tuesday 22 April, 1997