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GALILEO

The Galileo Energetic Particles Detector

 

Galileo EPD Handbook

 

Appendices

 

Appendix A. EDR File Structure (continued)

 

4. EPD Telemetry Packet Definitions

Source: R. C. Moore, SDO/PAO 0040, Jan. 1981

 

Byte Chan
  No.
Bits   per
Chan
Bit
Check-sum
Channel
Identification
Conversion Rule Comments
1 1 8 8 Subcommutated  housekeeping and status (A function of subcom cursor. Value of cursor =7*(Mod13)+(Mod7)+1) 
C=7*ch. 23+ch 22+1
Subcommutated housekeeping and status data are defined by R. C. Moore, memo of 8/26/79.
2 2 1 9 Scan error 0=no error
1=error detected by motor controller
Scan error means motor did not reach desired sector position.
  3 1 10 Fast scan abort flag 0=normal
1=fast scan
was recently aborted
Automatic fast scan abort occurs when motor's capacitor depth of discharge is too large.
  4 1 11 Emergency count flag 0=normal
1="emergency count number," modulo 32, occupies channels 5, 6, and 7 instead of direction indicator, and motor position code. Motor controller is in its "emergency" mode.
Emergency count number, when present, equals 16B4+8B5+4B6+2B7+B8
  5 1 12 Direction indicator 1=clockwise
0=counterclockwise
Stepping platform motor is bi-directional.
  6 1 13 Centerline indicator 0=not on centerline
1=on centerline
Off centerline means motor is not accurately aligned with desired sector.
  7 3 16 Motor position code 4B6+2B7+B8=P Position code for 8 sectors as follows:
P=0=sector 0 (shield)
P=1=sector 1
P=2=sector 2
P=3=sector 3
P=4=sector 4
P=5=sector 5
P=6=sector 6
P=7=sector 7
3 8 8 24 Memory dump, alias "memory trickle readout"   Contents of ROM or RAM as addressed by memory dump cursor. 65,536 bytes are dumped into telemetry every 12 hr, 8 min, 10 2/3 sec.
4 9 8 32 Memory dump cursor (8 LSBs)   8 MSBs of memory dump cursor are in subcommed housekeeping/status
5 10 8 40 Number of commands executed, modulo 256 N=128B1+64B2+32B3
+16B4+8B5+4B6
+2B7+B8
At power-on, N=0. Increments by one with each command executed.
6 11 8 48 Packet parity   Exclusive OR of all other bytes in this packet (bytes 15,7-76).
7 12 8 56 Operation code of last command executed See command listings in GLL-3-290. Comparison with byte 5 reveals missed commands.
8 13 1 57 (spare)    
  14 1 58 Power monitor flag 0=normal
1=power to EPD has recently been interrupted
Automatic EPD reset and resync following power interruption.
  15 1 59 Bus adapted parity error flag 0=normal (good parity)
1=EPD bus adapter recently detected bad parity on supervisory data line.
Bad parity could mean an error in real-time clock transfer or in EPD bus command.
  16 1 60 Resynchronization flag 0=normal
1=EPD recently resynced to CDS
Resync occurs at power-on, following a power interruption, or at execution of "EPD resync to CDS" bus command.
  17 1 61 Cease scan flag 0=normal
1=motor controller has entered "cease scan" mode
 
  18 1 62 Motor in motion flag 0=normal
1=motor was in motion when data contained in this logical record were gathered.
Data taken while motor is in motion are not to be correlated with data taken while motor is "on sector."
  19 1 63 Singles/background flag 0=s/b format L
1=s/b format J or s/b format J' (contents of channel 20 determine whether J or J' is used.)
s/b formats are described in S3D-79-088* and S3D-79-090* (*not available on this website; reference APL S3 Division archives).
  20 1 64 J/J' indicator 0=CMS mode J
1=CMS mode J'
Mode J is used when CMS 180 deg. end is in use. Mode J' is used when CMS 0 deg. end is in use.
9 21 1 65 Mod 2 counter, alias "odd packet indicator" Always logic 0. (Bytes 1 through 76 are in the "even" packet.) Used to determine if packet is first half or second half of logical record. (Compare with channel 107.)
  22 3 68 Mod 7 counter N=4B2+2B3+B4
0<=N<=6
N increments by one every packet. One EPD packet per LRS minor frame. 91 LRS minor frames per major frame. (See channel 108.)
  23 4 72 Mod 13 counter M=8B5+4B6+2B7+B8
0<=M<=12
M increments by one every 7 packets.
10 24 8 80 CMS PHA dEJ no. 1 dEJ1=128B1+64B2+32B3+
16B4+8B5+4B6+2B7+B8
On each Mod 7=0 (inc. 1/packet)
11 25 8 88 CMS PHA dEK no. 1 dEK1=128B1+64B2+32B3+ 16B4+8B5+4B6+2B7+B8 CMS PHA is replaced by channels 1-12 of LEMMS PHA.
12 26 8 96 CMS PHA TOF no. 1 TOF1=128B1+64B2+32B3+1
6B4+8B5+4B6+2B7+B8
The remaining 35 channels come in 7 groups of 5 in LEMMS PHA in this and the following 6 packets.
13 27 2 98 J ID no. 1 J1 ID=2B1+B2 J ID=0=Jc
J ID=1=Jb
J ID=3=Ja
  28 2 100 Last transmited Priority no. 1 P1=2B3+B4 P=0=priority I
P=1=priority II
P=2=priority III
P=3=priority IV
  29 4 104 CMS PHA rate channel code no. 1 R1=8B5+4B6+2B7+B8 Bits B5 and B6 determine event's priority.
R Value Rate Channel
0 CM5
1 CN0
2 CN1
3 CH5
4 CH2
5 CH3
6 CH4
7 (not used)
8 CM2
9 CM3
10 CM4
11 (not used)
12 CA2
13 CA3
14 CA4
15 (not used)
Rate
Channel
Priority
CM5

I

CN0
CN1
CH5
CH2

II

CH3
CH4
CM2

III

CM3
CM4
CA2

IV

CA4
CA4
 14 30 8 112 CMS PHA dEJ no. 2 (same as dEJ1)  
15 31 8 120 CMS PHA dEK no. 2 (same as dEK1)  
16 32 8 128 CMS PHA TOF no. 2 (same as TOF1)  
17 33 2 130 J ID no. 2 (same as J1 ID) (See comments for channel 27.)
  34 2 132 Last transmitted priority no. 2 (same as P1) (See comments for channel 28.)
  35 4 136 CMS PHA rate channel code no. 2 (same as R1) (See comments for channel 29.)
18 36 8 144 CMS PHA dEJ no. 3 (same as dEJ1  
19 37 8 152 CMS PHA dEK no. 3 (same as dEK1)  
20 38 8 160 CMS PHA TOF no. 3 (same as TOF1)  
21 39 2 162 J ID no. 3 (same as J1 ID) (See comments for channel 27.)
  40 2 164 Last transmitted Priority No. 3 (same as P1) (See comments for channel 28.)
  41 4 168 CMS PHA rate channel code no. 3 (same as R1) (See comments for channel 29.)
22 42 8 176 LEMMS PHA spectrum element no. 1 Mantissa=8B5+4B6+2B7+B8
Exponent=8B1+4B2+2B3+B4
If exponent=15, then value=mantissa.
Else value=(mantissa+16).2exponent.
See bytes 10-21.
23 43 8 184 LEMMS PHA spectrum element no. 2 (same as for channel 42)  
24 44 8 192 LEMMS PHA spectrum element no. 3 (same as for channel 42)  
25 45 8 200 LEMMS PHA spectrum element no. 4 (same as for channel 42)  
26 46 8 208 LEMMS PHA spectrum element no. 5 (same as for channel 42)  
27,28 47 10 218 E0 no. 1 Exp=16B1+8B2+4B3+2B4+B5
Man=16B6+8B7+4B8+2B1+B2
If exp=31, then value=mantissa.
Else value=(man+32) .2 exp
LEMMS electrons 
.015 MeV to .030 MeV
28,29 48 10 228 E1 no. 1 Exp=16B3+8B4+4B5+2B6+B7
Man=16B8+8B1+4B2+2B3+B4
If exp=31, then value=man. 
Else value=(man+32) .2 exp
LEMMS electrons 
.030 MeV to .045 MeV
29,30 49 10 238 A0 no. 1 Exp=16B5+8B6+4B7+2B8+B1
Man=16B2+8B3+4B4+2B5+B6
If exp=31, then value=man. 
Else value=(man+32) .2 exp
LEMMS z>=1
.020 MeV to .030 MeV
30,31 50 10 248 A1 no. 1 Exp=16B7+8B8+4B1+2B2+B3
Man=16B4+8B5+4B6+2B7+B8
If exp=31, then value=man.
Else value=(man+32) .2 exp
LEMMS z>=1
.030 MeV to .050 MeV
32,33 51 10 258 A2 no. 1 (same as ch. 47) LEMMS z>=1
.050 MeV to .100 MeV
33,34 52 10 268 E2 no. 1 (same as ch. 48) LEMMS electrons
.045 MeV to .060 MeV
34,35 53 10 278 E3 no. 1 (same as ch. 49) LEMMS electrons
.060 MeV to .100 MeV
35,36 54 10 288 F0 No. 1 (same as ch. 50) LEMMS electrons
.100 MeV to .200 MeV
37,38 55 10 298 F1 no. 1 (same as ch. 47) LEMMS electrons
.200 MeV to .350 MeV
38,39 56 10 308 A3 no. 1 (same as ch. 48) LEMMS z>=1
.100 MeV to .250 MeV
39,40 57 10 318 A4 no. 1 (same as ch. 49) LEMMS z>=1
.250 MeV to .500 MeV
40,41 58 10 328 A5 no. 1 (same as ch. 50) LEMMS z>=1
.500 MeV to .800 MeV
42,43 59 10 338 A6 no. 1 (same as ch. 47) LEMMS z>=1
.800 MeV to 1.60 MeV
43,44 60 10 348 A7 no. 1 (same as ch. 48) LEMMS z>=1
1.60 MeV to 3.40 MeV
44,45 61 10 358 F2 no. 1 (same as ch. 49) LEMMS electrons
.350 MeV to .600 MeV
45,46 62 10 368 F3 no. 1 (same as ch. 50) LEMMS electrons
.600 MeV to 1.00 MeV
47,48 63 10 378 CE2 (same as ch. 47) CMS electrons
100 keV to 200 keV
48,49 64 10 388 CE3 (same as ch. 48) CMS electrons
200 keV to >300 keV
49,50 65 10 398 CE1 (same as ch. 49) CMS electrons
50.0 keV to 100 keV
50,51 66 10 408 CP1 (same as ch. 50) CMS protons
200 keV to 290 keV
52,53 67 10 418 E0 no. 2 (same as ch. 47) LEMMS electrons
.015 MeV to .030 MeV
53,54 68 10 428 E1 no. 2 (same as ch. 48) LEMMS electrons
.030 MeV to .045 MeV
54,55 69 10 438 A0 no. 2 (same as ch. 49) LEMMS z>=1
.020 MeV to .030 MeV
55,56 70 10 448 A1 no. 2 (same as ch. 50) LEMMS z>=1
.030 MeV to .050 MeV
57,58 71 10 458 CP2 (same as ch. 47) CMS protons
290 keV to 500 MeV
58,59 72 10 468 CP3 (same as ch. 48) CMS protons
500 keV to 1.40 MeV
59,60 73 10 478 CH0 (same as ch. 49) CMS heavy nuclei
.025 MeV to .035 MeV
60,61 74 10 488 CH1 (same as ch. 50) CMS heavy nuclei
.070 MeV to .100 MeV
62,63 75 10 498 A8 (same as ch. 47) LEMMS z>=2
3.40 MeV to 12.4 MeV
63,64 76 10 508 DC0 (same as ch. 48) LEMMS z>=1
15.5 MeV to 28 MeV
64,65 77 10 518 DC1 (same as ch. 49) LEMMS z>=1
42 MeV to 55 MeV
65,66 78 10 528 DC2 (same as ch. 50) LEMMS electrons
>=2 MeV
67,68 79 10 538 DC3 (same as ch. 47) LEMMS electrons
>=11 MeV
68,69 80 10 548 B0 (same as ch. 48) LEMMS z=1
3.4 MeV to 10.5 MeV
69,70 81 10 558 B1 (same as ch. 49) LEMMS electrons
1.5 MeV to 10.5 MeV
70,71 82 10 568 B2 (same as ch. 50) LEMMS z=2
12.4 MeV to 250 MeV
72,73 83 10 578 CA1 (same as ch. 47) CMS alphas
.17 MeV to .39 MeV
73,74 84 10 588 CA3 (same as ch. 48) CMS alphas
.38 MeV to .80 MeV
74,75 85 10 598 CA4 (same as ch. 49) CMS alphas
.80 MeV to 1.8 MeV
75,76 86 10 608 CM1 (same as ch. 50) CMS medium nuclei
.16 MeV to .45 MeV
77 87 8 616 Subcommutated housekeeping and status (A function of subcom cursor. Value of cursor=13x(mod 7)+(mod 13)+1)
C=13 x channel 108 + channel 109+1
(same as for ch. 1)
78 88 1 617 Scan error (same as ch. 2) (same as for ch. 2)
  89 1 618 Fast scan abort flag (same as ch. 3) (same as for ch. 3)
  90 1 619 Emergency count flag 0=normal.
1="emergency count number," modulo 32, occupies channels 91, 92, and 93 instead of direction indicator, centerline indicator, and motor position code. Motor controller is in its "emergency" mode
.
(same as for ch. 4)
  91 1 620 Direction indicator (same as ch. 5) (same as for ch. 5)
  92 1 621 Centerline indicator (same as ch. 6) (same as for ch. 6)
  93 3 624 Motor position code (same as ch. 7) (same as for ch. 7)
79 94 8 632 Memory dump, alias "memory trickle readout"   (same as for ch. 8)
80 95 8 640 Memory dump cursor (8 LSBs)   (same as for ch.  9)
81 96 8 648 Number of commands executed, modulo 256 (same as ch. 10) (same as for ch. 10)
82 97 8 656 Packet parity   (same as for ch. 11)
83 98 8 664 Operation code of last command executed (same as ch. 12) (same as for ch. 12)
84 99 1 665 (spare)    
  100 1 666 Power monitor flag (same as ch. 14) (same as for ch. 14)
  101 1 667 Bus adapter parity error flag (same as ch. 15) (same as for ch. 15)
  102 1 668 Resynchronization flag (same as ch. 16) (same as for ch. 16)
  103 1 669 Cease scan flag (same as ch. 17)  
  104 1 670 Motor in motion flag (same as ch. 18) (same as for ch. 18)
  105 1 671 Singles/background flag 0=s/b format L
1=s/b format J or s/b format J' (Contents of channel 106 determine whether J or J' is used.)
(same as for ch. 19)
  106 1 672 J/J' indicator (same as ch. 20) (same as for ch. 20)
85 107 1 673 Mod 2 counter, alias "odd packet indicator" Always logic "1." (Bytes 77 through 152 are in the "odd" packet.) Compare with ch. 21.
  108 3 676 Mod 7 counter (same as ch. 22) (same as for ch. 22)
  109 4 680 Mod 13 counter (same as ch. 23) (same as for ch. 23)
86 110 8 688 CMS PHA dEJ no. 4 (same as ch. 24)  
87 111 8 696 CMS PHA dEK no. 4 (same as ch. 25)  
88 112 8 704 CMS PHA TOF no. 4 (same as ch. 26)  
89 113 2 706 J ID no. 4 (same as ch. 27) (same as for ch. 27)
  114 2 708 Last transmitted priority no. 4 (same as ch. 28) (same as for ch. 28)
  115 4 712 CMS PHA rate channel code no. 4 (same as ch. 29) (same as for ch. 29)
90 116 8 720 CMS PHA dEJ no. 5 (same as dEJ1)  
91 117 8 728 CMS PHA dEK no. 5 (same as dEK1)  
92 118 8 736 CMS PHA TOF no. 5 (same as TOF1)  
93 119 2 738 J ID no. 5 (same as J1 ID) (same as for ch. 27)
  120 2 740 Last transmitted priority no. 5 (same as P1) (same as for ch. 28)
  121 4 744 CMS PHA rate channel Code no. 5 (same as R1) (same as for ch. 29)
94 122 8 752 CMS PHA dEJ no. 6 (same as dEJ1)  
95 123 8 760 CMS PHA dEK no. 6 (same as dEK1)  
96 124 8 768 CMS PHA TOF no. 6 (same as TOF1)  
97 125 2 770 J ID no. 6 (same as J1 ID) (See comments for channel 27.)
  126 2 772 Last transmitted priority no. 6 (same as P1) (same as for ch. 28)
  127 4 776 CMS PHA rate channel code no. 6 (same as R1) (same as for ch. 29)
98 128 8 784 LEMMS PHA spectrum element no. 6 (same as ch. 42) Energy bin number=5x (channel 109)+1
99 129 8 792 LEMMS PHA spectrum element no. 7 (same as ch. 42) Energy bin number=5x (channel 109)+2
100 130 8 800 LEMMS PHA spectrum element no. 8 (same as ch. 42) Energy bin number=5x (channel 109)+3
101 131 8 808 LEMMS PHA spectrum element no. 9 (same as ch. 42) Energy bin number=5x (channel 109)+4
102 132 8 816 LEMMS PHA spectrum element no. 10 (same as ch. 42) Energy bin number=5x (channel 109)+5
103,104 133 10 826 E0 no. 3 (same as ch. 47) LEMMS electrons .015 MeV to .030 MeV
104,105 134 10 836 E1 no.3 (same as ch. 48) LEMMS electrons .030 MeV to .045 MeV
105,106 135 10 846 A0 no. 3 (same as ch. 49) LEMMS z>=1
.020 MeV to .030 MeV
106,107 136 10 856 A1 no. 3 (same as ch. 50) LEMMS z>=1
.030 MeV to .050 MeV
108,109 137 10 866 A2 no. 2 (same as ch. 47) LEMMS z>=1
.050 MeV to .100 MeV
109,110 138 10 876 E2 no. 2 (same as ch. 48) LEMMS electrons .045 MeV to .060 MeV
110,111 139 10 886 E3 no. 2 (same as ch. 49) LEMMS electrons .060 MeV to .100 MeV
111,112 140 10 896 F0 no. 2 (same as ch. 50) LEMMS electrons .100 MeV to .200 MeV
113,114 141 10 906 F1 no. 2 (same as ch. 47) LEMMS electrons .200 MeV to .350 MeV
114,115 142 10 916 A3 no. 2 (same as ch. 48) LEMMS z>=1
.100 MeV to .250 MeV
115,116 143 10 926 A4 no. 2 (same as ch. 49) LEMMS z>=1
.250 MeV to .500 MeV
116,117 144 10 936 A5 no. 2 (same as ch. 50) LEMMS z>=1
.500 MeV to .800 MeV
118,119 145 10 946 A6 no. 2 (same as ch. 47) LEMMS z>=1
.800 MeV to 1.60 MeV
119,120 146 10 956 A7 no. 2 (same as ch. 48) LEMMS z>=1
1.60 MeV to 3.40 MeV
120,121 147 10 966 F2 no. 2 (same as ch. 49) LEMMS electrons
.350 MeV to .600 MeV
121,122 148 10 976 F3 no. 2 (same as ch. 50) LEMMS electrons
.600 MeV to 1.00 MeV
123,124 149 10 986 CM3 (same as ch. 47) CMS medium nuclei
.410 MeV to 1.00 MeV
124,125 150 10 996 CM4 (same as ch. 48) CMS medium nuclei
1.00 MeV to 2.70 MeV
125,126 151 10 1006 CM5 (same as ch. 49) CMS medium nuclei
2.70 MeV to 10.7 MeV
126,127 152 10 1016 CN1 (same as ch. 50) CMS intermediate nuclei
2.00 MeV to 11.7 MeV
128,129 153 10 1026 E0 no. 4 (same as ch. 47) LEMMS electrons
.015 MeV to .030 MeV
129,130 154 10 1036 E1 no. 4 (same as ch. 48) LEMMS electrons
.030 MeV to .045 MeV
130,131 155 10 1046 A0 no. 4 (same as ch. 49) LEMMS z>=1
.020 MeV to .030 MeV
131,132 156 10 1056 A1 no. 4 (same as ch. 50) LEMMS z>=1
.030 MeV to .050 MeV
133,134 157 10 1066 CH2 (same as ch. 47) CMS heavy nuclei
.110 MeV to .370 MeV
134,135 158 10 1076 CH3 (same as ch. 48) CMS heavy nuclei
.33 MeV to .80 MeV
135,136 159 10 1086 CH4 (same as ch. 49) CMS heavy nuclei
.80 MeV to 1.7 MeV
136,137 160 10 1096 CH5 (same as ch. 50) CMS heavy nuclei
1.7 MeV TO 13 MeV
138,139 161 10 1106 SB4 (same as ch. 47)
CHAN
105  
CHAN
106  
RATE
CHAN
0 0 EB1
0 1 EB1
1 0 KS
1 1 K'S
139,140 162 10 1116 SB5 (same as ch. 48)
CHAN
105  
CHAN
106  
RATE
CHAN
0 0 EB2
0 1 EB2
1 0 JbS
1 1 EB2
140,141 163 10 1126 SB6 (same as ch. 49)
CHAN
105  
CHAN
106  
RATE
CHAN
0 0 FB2
0 1 FB2
1 0 FB1
1 1 FB1
141,142 164 10 1136 SB0 (same as ch. 50)
CHAN
105  
CHAN
106  
RATE
CHAN
0 0 AS
0 1 AS
1 0 AS
1 1 AS
143,144 165 10 1146 CA0 (same as ch. 47) CMS alphas
.08 MeV to .19 MeV
144,145 166 10 1156 CA2 (same as ch. 48) CMS alphas
.19 MeV to .45 MeV
145,146 167 10 1166 SB1 (same as ch. 49)
CHAN
105  
CHAN
106  
RATE
CHAN
0 0 BS
0 1 BS
1 0 LS
1 1 BS
146,147 168 10 1176 SB2 (same as ch. 50)
CHAN
105  
CHAN
106  
RATE
CHAN
0 0 CS
0 1 CS
1 0 JaS
1 1 Ja'S
148,149 169 10 1186 CM0 (same as ch. 47) CMS medium nuclei
.08 MeV to .15 MeV
149,150 170 10 1196 CM2 (same as ch. 48) CMS medium nuclei
.14 MeV to .59 MeV
150,151 171 10 2306 CN0 (same as ch. 49) CMS intermediate nuclei
.91 MeV to 2.0 MeV
151,152 172 10 1216 SB3 (same as ch. 50)
CHAN
105  
CHAN
106  
RATE
CHAN
0 0 DS
0 1 DS
1 0 JcS
1 1 Jc'S

 

 

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Updated 1/2/19, Cameron Crane

QUICK FACTS

Manufacturer: The Galileo Spacecraft was manufactured by the Jet Propulsion Laboratory, Messerschmitt-Bölkow-Blohm, General Electric, and the Hughes Aircraft Company.

Mission Duration: Galileo was planned to have a mission duration of around 8 years, but was kept in operation for 13 years, 11 months, and 3 days, until it was destroyed in a controlled impact with Jupiter on September 21, 2003.

Destination: Galileo's destination was Jupiter and its moons, which it orbitted for 7 years, 9 months, and 13 days.