karn@allegra.UUCP (Phil Karn) (02/21/84)
Following is some very preliminary info on the default telemetry format
for UOSAT-B. Some items have not yet been calibrated, others have been
but the equations aren't where I am. This is being entered during some
planned s/c down time. The DCE is in good shape so
I've got some spare time.
2/19/84 Preliminary UOSAT-B telemetry data format. Currently
incomplete. All equations subject to change. Some
item names will change, although the actual function of
all telemetry items has now been fixed.
Checksummed TLM format. Channel format is:
nnvvvc
nn - channel number
vvv - value
c - To compute checksum, convert each ascii
character into the binary, e.g. 'A', which
comes in as 41H becomes 0AH. Exclusive OR
all 5 values. Convert the lower four bits
of the XOR answer to an ascii hex digit, e.g.
0BH becomes 42H, this character is the checksum.
A 1Eh cursor home character preceeds UOSAT-2 in each frame
The number after UOSAT-2 on the header line is the date
in YYMMDDWHHMMSS, W is day of week, 0-6. The date below
is bogus, it wasn't initialized after the s/c was powered
up. The s/c was in the Bldg 836 clean room when this
frame was taken. Some of the data is valid.
UOSAT-2 0000010040621
00515101039B02011203010204023505028F06025107031508032909026D
10515011000012005613010314000515000416000717736418736B19736A
205153210322226677230001240017250007260774277367287368297369
30515231016532284F33000034000735030536000537736638353E39353F
40763641000542688043000744000045056246000247736148353949346C
50561751017252661653263154111055852F56000357306758736F593539
602105617BC762800C630041641003651C0E66140567340668000E69000F
Non-checksummed frame. Everything is the same as above expect
that the checksum character becomes a space. This format is
more pleasing to the human eye.
UOSAT-2 0000010040630
00515 01035 02010 03010 04023 05028 06025 07031 08032 09026
10515 11000 12004 13010 14000 15000 16000 17736 18736 19736
20515 21032 22667 23000 24001 25000 26077 27736 28736 29736
30515 31016 32284 33000 34000 35028 36000 37736 38353 39353
40763 41000 42688 43000 44000 45055 46000 47736 48353 49346
50561 51017 52661 53256 54111 55852 56000 57306 58736 59353
60210 617BC 62800 63004 64100 651C0 66140 67340 68000 69000
A dwell format is also available, in which only selected
channels are displayed. The channels can come out in any
order, in checksummed or non-checkedsummed format. The
UOSAT-2 and time stamp may or may not be included.
Chan # Name Equation
00 Solar array current -Y I=1.9(516-N) ma
01 Nav mag X axis H=(0.1485N-68) uT
02 Nav Mag Z axis H=(0.1523N-69.3) uT
03 Nav mag Y axis H=(0.1507N-69) uT
04 Sun sensor #1 its
05 Sun sensor #2 a
06 Sun sensor #3 bit
07 Sun sensor #4 tricky
08 Sun sensor #5 at this
09 Sun sensor #6 time (Ian)
10 Solar array current +Y I=1.9(516-N) mA
11 Nav mag (Wing) temp T=(330-N)/3.45 C
12 Horizon sensor
13 Spare (tbd)
14 DCE RAMUNIT current
15 DCE CPU current
16 DCE GMEM current
17 Facet temp +X T=(480-N)/5 C
18 Facet temp +Y T=(480-N)/5 C
19 Facet temp +Z T=(480-N)/5 C
20 Solar array current -X I=1.9(516-N) mA
21 +10V line current I=0.97N mA
22 PCM voltage +10V V=0.015N V
23 P/W logic current (+5V) I=0.14 (N<=500)
24 P/W Geiger current (+14V) I=0.21N mA
25 P/W Elec sp.curr (+10V) I=0.096N mA
26 P/W Elec sp.curr (-10V) I=0.093 mA
27 Facet temp -X T=(480-N)/5 C
28 Facet temp -Y T=(480-N)/5 C
29 Facet temp -Z T=(480-N)/5 C
30 Solar array current +X I=1.9(516-N) mA
31 -10V line current I=0.48N mA
32 PCM voltage -10V V=0.036N V
33 1802 comp curr (+10V) I=0.21N mA
34 Digitalker current (+5V) I=0.13N mA (N<=500)
35 145MHz beacon power O/P P=(2.5N - 275) mW (N>200)
36 145MHz beacon current I=0.22N mA
37 145MHz beacon temp T=(480-N)/5 C
38 Command decoder temp (+Y) T=(480-N)/5 C
39 Telemetry temp (+X) T=(480-N)/5 C
40 Solar array voltage (+30V) V=(0.1N-51.6) V
41 +5V line current I=0.97N mA
42 PCM voltage +5V V=0.0084N V
43 DSR current (+5V) I=0.21N mA (n<=500)
44 Command RX current I=0.92N mA
45 435MHz beacon power O/P P=(2.5N-200) mW N>175
46 435MHz beacon current I=0.44N mA
47 435MHz beacon temp T=(480-N)/5 C
48 P/W temp (-X) T=(480-N)/5 C
49 BCR temp (-Y) T=(480-N)/5 C
50 Battery charge/dischg curr I=8.8(N-513) mA
51 +14V line current I-5N mA
52 Battery voltage (+14V) V=0.21N V
53 Battery cell volts (MUX) See below
54 Telemetry current (+10V) I=0.02N mA
55 2.4GHz beacon power O/P P=((N+50)**2)/480 mW
56 2.4GHz beacon current I=0.45N mA
57 Battery temp T=(480-N)/5 C
58 2.4GHz beacon temp T=(480-N)/5 C
59 CCD imager temp T=(480-N)/5 C
60-67 Status points 1-96
(the status points have been keyed in already at surrey, I'm not
going to key them in again, there are a whacking great lot of them
(I'm picking up the lingo), I'll append them when Mac forwards the
file from the UK.)
Multiplexed Battery Scheme (channel 53)
Six consecutive TLM frames will carry the total volts, the following ten
frames will be individual cells, starting with cell #10. Each cell has
its own equation.
Cell Equation
ALL
10
9
8
7
6 (not available, in Surrey)
5
4
3
2
1
The DCE currents will have small counts even when the DCE is off. We think
this is due to the +10 coming in from the Nav Mag lines. If the Nav
Mag is off (unlikely), the DCE currents will be zero when both it and
the Nav Mag are off.
Ps, the beacon freqs are
145.825 (yes, the same as uos-1, but
6 hours apart)
435.025
2401.0
The tones are the same as uosat-1, but the
sense of mark and space are reversed.
Harold.