"CCSDS telecommand header" (SVC/ITC)

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Focus:	Maintenance / Operation
Structures:	Abstract / Concrete

Ancestry:

0x000	pkt	CmdConfirm
0x028	str	CmdHeader cmd_hdr

Definition:

Alignment:	2-byte boundary
APID:	720/0x2D0
Attribute(s):
Length:	64 bits (8 bytes)
Offset:	0x028

Description:

CCSDS telecommand header

Layout: (hide detail; help)

CCSDS telecommand header (CmdHeader) Telemetry Field Format
0x	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
028	Hdr0 hdr0
02A	Hdr1 hdr1
02C	Cmd_len cmd_len
02E	Hdr3 hdr3

CmdHeader (str)
|  Hdr0 hdr0 (bf)
|  |  Version ver (0-2)
|  |  isCmd isCmd (3)
|  |  Sec_hdr sec_hdr (4)
|  |  Apid apid (5-15)
|  Hdr1 hdr1 (bf)
|  |  Seq_flg seq_flg (0-1)
|  |  Seq_cnt seq_cnt (2-15)
|  Cmd_len cmd_len (fld)
|  Hdr3 hdr3 (bf)
|  |  Fnc_pad fnc_pad (0)
|  |  Fnc_code fnc (1-15)

typedef struct _ITC_CmdHeader {

    /* CCSDS telecommand header (bytes 0-1) */
    ITC_Hdr0             hdr0;

    /* CCSDS telecommand header (bytes 2-3) */
    ITC_Hdr1             hdr1;

    /* CCSDS telecommand packet length */
    unsigned short       cmd_len;

    /* CCSDS telecommand header (bytes 6-7) */
    ITC_Hdr3             hdr3;

} ITC_CmdHeader;

Fields:

Cmd_len (index)

Attribute(s):  

Brief:  "CCSDS telecommand packet length"

Instance(s):  cmd_len

CCSDS packet length (CCSDS definition, which is a little wierd).

Hdr0 (index)

Attribute(s):  

Brief:  "CCSDS telecommand header (bytes 0-1)"

Instance(s):  hdr0

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

Hdr1 (index)

Attribute(s):  

Brief:  "CCSDS telecommand header (bytes 2-3)"

Instance(s):  hdr1

Bitfileds for bytes 2-3 of a standard CCSDS telecommand header

Hdr3 (index)

Attribute(s):  

Brief:  "CCSDS telecommand header (bytes 6-7)"

Instance(s):  hdr3

Bitfields for bytes 6-7 of a standard CCSDS telecommand header, where a two-byte secondary header containing a function code has been defined.