3.12 Housekeeping Data

For the housekeeping data there are only 6 registers available. But there are more than 6 different values to show therefore we have to share values on the same register. The contents of the registers depends on the Operation mode where the QM is in.

There is an additional bit for alarm conditions for the acceleration, the tank pressure and the pipe pressure. It is bit 15 an it is used to inform about unexpected values (e.g. the pipe pressure is higher than the tank pressure).

For all QM HKs derived from the ADC (all currents, all pressures and acceleration) the bit 12 is the overflow bit. The overflow bit is not implemented in the QM (it is always zero).

+5 V supply current

Current measurement from I/F board
12 bit unsigned integer, range 0 .. 1.25 A, resolution 305 uA

+12 V supply current

Current measurement from I/F board
12 bit unsigned integer, range 0 .. 0.625 A, resolution 153 ua

+28 V supply current

Current measurement primary bus
12 bit unsigned integer, range 0 .. 1.09 A, resolution 265 uA

-5 V supply current

Current measurement from I/F board
12 bit unsigned integer, range 0 .. 125 mA, resolution 30.5 uA

-12 V supply current

Current measurement from I/F board
12 bit unsigned integer, range 0 .. 125 mA, resolution 30.5 uA

Acceleration

measurement accelerometer
12 bit unsigned integer, Zero acceleration is on 0.25 V, the sensitivity is 62.5 V/g, range -4 mg .. 36 mg, resolution 9.77 $\mu$g. The expected acceleration is 22.4 mg (2703 = 0x0A8F, 1.65 V), zero acceleration is 0.25 V, 410 = 0x019A

Pipe Pressure

measurement absolut pressure in the pipe (between tank opener and valves
12 bit unsigned integer, range 0 .. 100 bar, resolution 25.7 mbar

Tank Pressure

measurement absolut pressure in the tank
12 bit unsigned integer, range 0 .. 100 bar, resolution 25.7 mbar

Temperature

The Flight Model will get the apropriate temperature for the ADS from the Thermo subsystem (TCU). For the QM the temperature is fixed on 25.
8 bit integer, range -128 .. 127, resolution 1 C

Desired Velocity

11 bit unsigned integer, range 0 .. 2047 mm/s, resolution 1 mm/s

Actual Velocity

11 bit unsigned integer, range 0 .. 2047 mm/s, resolution 1 mm/s

Table 17: Housekeeping Registers, Overview

Register	Description	Value
HK7	Synchronsation	0xAA55
HK6	Control	see table 5 on page
HK5	Status	see table 18
HK4	depends on Status
HK3	depends on Status
HK2	depends on Status
HK1	depends on Status
HK0	depends on Status

Table 18: Status

Name	Bit	Reference
Operation	4 .. 7	see table 19
State	8 .. 16	see table 20
Mission	0 .. 3	see table 21

Table 19: Operation

Operation Number	Hex Mask	Description
0	0000	not valid
1	0010	Standby
2	0020	Health Check
3	0030	Check Out
4	0040	Preparation
5	0050	Mission Set
6	0060	Acceleration Set
7	0070	Descent
8	0080	Landing
9	0090	Patch

Table 20: State (F_Error)

Bit	Hex Mask	Description
8	0100	Valve 1 failed
9	0200	Valve 2 failed
10	0400	Tank Opener 1 failed
11	0800	Tank Opener 2 failed
12	1000	CDMS communication error
13	2000	unexpected command
14	4000	not consistent data (e.g. patch)
15	8000	CDMS request undue

Table 21: Mission

Mission Number	Hex Mask	Description
0		not valid
1	0001	Nominal
2	0002	Fail Tolerant
3	0003	ADS Failed

Table 22: Standby Houskeeping Data

Register	Description	Range
HK7	Synchronsation	0xAA55
HK6	Control	see table 5 page
HK5	Status	Standby (1)
HK4	+5 V current
HK3	+12 V current
HK2	+28 V current
HK1	-5 V current
HK0	-12 V current

Table 23: Health Check Houskeeping Data

Register	Description	Range
HK7	Synchronsation	0xAA55
HK6	Control	see table 5
HK5	Status	Health Check (2)
HK4	+5 V current
HK3	Temperature
HK2	Acceleration
HK1	Pipe Pressure
HK0	Tank Pressure

Table 24: Checkout Houskeeping Data

Register	Description	Range
HK7	Synchronsation	0xAA55
HK6	Control	see table 5
HK5	Status	Checkout (3)
HK4	+5 V current
HK3	Temperature
HK2	Acceleration
HK1	Pipe Pressure
HK0	Tank Pressure

Table 25: Preparation Houskeeping Data

Register	Description	Range
HK7	Synchronsation	0xAA55
HK6	Control	see table 5
HK5	Status	Preparation (4)
HK4	+5 V current
HK3	Temperature
HK2	Acceleration
HK1	Pipe Pressure
HK0	Tank Pressure

Table 26: Mission Set Houskeeping Data

Register	Description	Range
HK7	Synchronsation	0xAA55
HK6	Control	see table 5
HK5	Status	Mission Set (5)
HK4	+5 V current
HK3	Desired Velocity
HK2	Acceleration
HK1	Pipe Pressure
HK0	Tank Pressure

Table 27: Acceleration Houskeeping Data

Register	Description	Range
HK7	Synchronsation	0xAA55
HK6	Control	see table 5
HK5	Status	Acceleration (6)
HK4	+5 V current
HK3	Desired Velocity
HK2	Acceleration
HK1	Pipe Pressure
HK0	Tank Pressure

Table 28: Descent Houskeeping Data

Register	Description	Range
HK7	Synchronsation	0xAA55
HK6	Control	see table 5
HK5	Status	Descent (7)
HK4	Actual Velocity
HK3	Temperature
HK2	Acceleration
HK1	Pipe Pressure
HK0	Tank Pressure

Table 29: Landing Houskeeping Data

Register	Description	Range
HK7	Synchronsation	0xAA55
HK6	Control	see table 5
HK5	Status	Landing (8)
HK4	+5 V current
HK3	+28 V current
HK2	Acceleration
HK1	Pipe Pressure
HK0	Tank Pressure

Table 30: Patch Houskeeping Data (same as standby)

Register	Description	Range
HK7	Synchronsation	0xAA55
HK6	Control	see table 5
HK5	Status	Standby (1)
HK4	+5 V current
HK3	+12 V current
HK2	+28 V current
HK1	-5 V current
HK0	-12 V current