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Fundamental TechnologiesVoyager LECP Pages |
Cruise 7 (Cruise 5a)
2 April 1981
Dr. S. M. Krimigis
Johns Hopkins University
Applied Physics Laboratory
Johns Hopkins Road
Laurel, Maryland 20810
Dear Dr. Krimigis:
Attached is a rough draft of the proposed EDR format for Cruise 7 (CR-7) telemetry data. This attachment describes only the LECP subheader and science data block. The standard EDR header will be used. The CR-7 format is intended to closely follow that for CR-5 with modifications made to allow for the different timing and data cycling in CR-7.
Please have your cognizant personnel review this material by April 17. I will be contacting each group by telephone prior to that date to discuss any questions that may arise.
Please feel free to call me at FTS 792-7840.
Sincerely,
David Wagner
DW:pp
Encl.
cc:
T. Armstrong
R. Collins
E. Franzgrote
G. Gloeckler
E. Keath
L. Lanzerotti
A. Sacks
C. Stembridge
E. Stone
H. Woo
618-306, CR-7, Revision D, Change 3
10.3 Low Energy Charged Particle (LECP) Experiment
The LECP EDR science physical record consisting of 24 CR-7 MFs corresponds to a 19.2 minute measurement period which is equivalent to three LECP instrument data cycles.
The LECP CR-7 EDR physical record structure is shown in Figure 10.3-1 and the physical magnetic tape organization is shown in Figure 10.3-2
.Standard Header (60-Words) |
Subheader (8-Words) |
Data Block (384-Words) |
24 MF 19.2 MIN 452 Words |
All Words 32-Bits
One physical record contains a standard EDR header followed by the LECP peculiar subheader and data block for 24 CR-7 telemetry frames.
One physical record contains 3 instrument cycles.
Figure 10.3.2 Physical Magnetic Tape Configuration for EDR Cruise 7.
EDR Word | Bits |
|||
31 | 15 0 | 31 | 15 0 | |
1 | LECP CMD 1 |
LECP CMD 2 |
LECP CMD 3 |
Spare |
2 | Spare |
Spare |
||
3 | Spare |
Spare |
||
5 | Spare |
Spare |
Total block length is 8 (32-bit) EDR words (24 MF; 1 to 3 LECP CMD words).
MF 1 is in:
SCT 60 = 0,24,48 when MOD 216 is even;
SCT 60 = 12,36 when MOD 216 is odd.
MF | EDR Word | Bits |
|||
31 16 15 0 31 16 15 0 | |||||
1 | 1 | P1 | P2 | P3 | P4 |
1 | 3 | P5 | P6 | P7 | P8 |
1 | 5 | P9 | P10 | P11 | P12 |
1 | 7 | P13 | P14 | P15 | P16 |
1 | 9 | R1 | R2 | R3 | R4 |
1 | 11 | R5 | R6 | R7 | R8 |
1 | 13 | R9 | R10 | R11 | R12 |
1 | 15 | R13 | R14 | R15 | R16 |
2 | 17 | P1 | P2 | P3 | P4 |
: | : | : | : | : | : |
24 | 383 | R13 | R14 | R15 | R16 |
P = PHA Word
R = Rate/Status Word
Logical record length is 384 (32-bit) EDR words equivalent to 24 MF or 768 LECP 10-bit words.
MF 1 is in:
SCT 60 = 0,24,48 when MOD 216 = EVEN;
SCT 60 = 12,36 when MOD 216 = ODD.
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Contents.
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Last modified 4/27/05, Tizby Hunt-Ward
tizby@ftecs.com