SPACEDOS01B
Dissipated Energy range: from 100 keV to 9 MeV (divided into 8 logarithmic channels)
Energy Resolution: < 50 keV
Integration Time: 15 s
Temperature Stability: from -50 ℃ to +50 ℃ within error +50 keV
Used Sensor: HAMAMATSU S11773-02 (PIN diode 5 x 5 x 0.5 mm3)
Weight: 33 g
The connector is depicted from PIN's side.
| Signal | Description |
|---|---|
| PD2 | Universal Input pin |
| PD3 | Universal Output pin |
| RX0 | RS232 Receive (3.3 V) |
| TX0 | RS232 Transmit (3.3 V) |
| RST# | Reset (trough capacitor) |
| GND | Ground |
| 3V3 | Power supply +3.3 V |
Power consumption: 2.6 mA from 3.3 V
$POSD,2a1c18d43c3937e40a3beb6c2855589b2d1a19e9
$ICSD
$DPSD,98,7fbd,36,1,0,0,0,0,0,0,100
$HKSD,9,98,800b,fe,0,0,7fbd,36,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
$BESD,4,e7,2,1,0,0,0,0,0
$ADSD,d3,3,0,0,0,0
SPACEDOS sends $DPSD, $HKSD, and $BESD messages each ~15 seconds. $ADSD message is sent once per day.
Communication speed is 2400 baud.
It transmits just after the power is on.
#POSD, <git hash>
| Value | Length | Type | Note |
|---|---|---|---|
| $POSD | 5 B | Char | Header |
| git hash | 20 B | Hex | Git hash tag from source file |
This information just says hello after power on.
It transmits ones after initialization after powering on.
#ICSD
Initiation of the SPACEDOS HW is done. Initiation is completed up to one second after power is on.
It transmits every 15 seconds.
$DPSD, <uptime>, <noise channel>, <0.1 MeV>, <0.14 MeV>, <0.21 MeV>, <0.33 MeV>, <0.66 MeV>, <1.68 MeV>, <4.72 MeV>, <'>=9 MeV'>, <DC offset>
| Value | Length | Type | Note |
|---|---|---|---|
| $DPSD | 5 B | Char | Header |
| uptime | 4 B | Hex | Time from power on |
| noise channel | 2 B | Hex | this channel containing noise |
| 0.1 MeV | 2 B | Hex | number of particles with absorbed energy above 0.1 MeV |
| ... | ... | ... | |
| '>=9' MeV | 2 B | Hex | Overrange particles |
| DC offset | 2 B | Hex | Offset of ADC |
These messages should be stored for long period and transmitted to the ground as a batch.
Minimal data payload (without time mark) is 18 B per 15 s => 103680 B per day
It transmits every 15 seconds.
$HKSD, <measurement No.> , <uptime>, <filter suppressions>, <position of the 1-st channel>, <1-st ch.>, <2-nd ch.>, <3-rd ch.>,...
There is a packet with housekeeping information. Transmission of this packet is done besides other experiments' housekeeping data. The total length of this packet should be shortened.
| Value | Range | type | Note |
|---|---|---|---|
| $HKSD | fix | Char | Header |
| measurement No. | 0..65535 | Hex | |
| uptime | 0..4294967295 | Hex | |
| filter suppressions | 0..65535 | Hex | Number of usage of a digital filter for double peak suppression |
| position of the 1-st channel | 0..511 | Hex | |
| 1-st ch. | 0..65535 | Hex | Number of events in 1-st ch. |
| 2-nd ch. | 0..65535 | Hex | Number of events in 2-nd ch. |
| ... | ... | ||
| 50-th ch. | 0..65535 | Hex | Number of events in 50-th ch. |
It transmits every 15 seconds. Values are zeroed after sending an ADSD message.
$BESD,<counter>, <0.1 MeV>, <0.14 MeV>, <0.21 MeV>, <0.33 MeV>, <0.66 MeV>, <1.68 MeV>, <4.72 MeV>, <'>=9 MeV'>
This message contains cumulative data for beacon transmission.
| Value | Length | Type | Note |
|---|---|---|---|
| $BESD | 5 B | Char | Header |
| counter | 2 B | Hex | Number of the beacon message |
| 0.1 MeV | 2 B | Hex | number of particles with absorbed energy above 0.1 MeV |
| 0.14 MeV | 2 B | Hex | number of particles with absorbed energy above 0.14 MeV |
| ... | ... | ... | |
| '>=9' MeV | 2 B | Hex | Overrange particles |
It transmits after 5760 beacon messages. (cca every one day)
$ADSD, <0.1 MeV 1 day old>, <0.14 MeV one day old>, <0.66 MeV one day old>, <0.1 MeV two days old>, <0.14 MeV two days old>, <0.66 MeV two days old>
This message contains two days old data for beacon transmission purposes.
| Value | Length | Type | Note |
|---|---|---|---|
| $ADSD | 5 B | Char | Header |
| 0.1 MeV one day old | 4 B | Hex | number of particles with absorbed energy above 0.1 MeV one day before |
| 0.14 MeV one day old | 4 B | Hex | number of particles with absorbed energy above 0.14 MeV one day before |
| 0.66 MeV one day old | 4 B | Hex | number of particles with absorbed energy above 0.66 MeV one day before |
| 0.1 MeV two days old | 4 B | Hex | number of particles with absorbed energy above 0.1 MeV two days before |
| 0.14 MeV two days old | 4 B | Hex | number of particles with absorbed energy above 0.14 MeV two days before |
| 0.66 MeV two days old | 4 B | Hex | number of particles with absorbed energy above 0.66 MeV two days before |