"CCSDS telecommand header (bytes 0-1)" (SVC/ITC)

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Focus:	Maintenance / Operation
Structures:	Abstract / Concrete

Definition:

Alignment:	2-byte boundary
APID:	720/0x2D0
Attribute(s):
C type:	unsigned short
Length:	16 bits (2 bytes)

Description:

Bitfields for the bytes 0-1 of a standard CCSDS telecommand header

Layout: (show detail; help)

Start	Stop	Size		Item Type and Name
0	2	3		Version ver
3	3	1		isCmd isCmd
4	4	1		Sec_hdr sec_hdr
5	15	11		Apid apid

Fields:

Apid (index)

Attribute(s):  

Brief:  "CCSDS application ID"

Instance(s):  apid

Standard CCSDS application identifier.

isCmd (index)

Attribute(s):  

Brief:  "CCSDS command bit"

Instance(s):  isCmd

Set for telecommands, clear for telemetry.

Sec_hdr (index)

Attribute(s):  

Brief:  "CCSDS secondary header flag"

Instance(s):  sec_hdr

Set when a CCSDS packet includes a secondary header. Clear otherwise. All LAT telemetry/telecommands carry a secondary header.

Version (index)

Attribute(s):  

Brief:  "CCSDS version"

Instance(s):  ver

Standard CCSDS version code

Used by:

CmdHeader