User manual

MEX ASPERA-3
Ref.:
ME-ASP-MA-0002
Issue:
Issue 1 Rev. 4
Date:
15/2/2002
Page:
Page 8 of 58
ASPERA-3 EGSE User Manual
IFSI
CNR
1.5 Instrument Interface
The EGSE will be connected only to the ASPERA-3 Main Unit of the ASPERA-3 experiment, and this
connection is realised through the spacecraft simulator interface. This interface surface will be active in
all operation foreseen for the EGSE. The spacecraft interface will be simulated by the EGSE, and be
fully compliant with the spacecraft bus system (including the connectors). The spacecraft power
simulator, included in the S/C simulator unit, will provide power and switching functions to the
ASPERA-3 experiment. The power supply will overvoltage and current limiting capabilities. The power
will be interfaced to the ASPERA-3 through one connector.
The EGSE consists of an RTU simulator for controlling the RPC and for acquiring the housekeeping
and science TM information. The science data may contain also memory dumps, or other engineering
data. The EGSE will acquire through the spacecraft communication interface the telemetry packets, the
EGSE will simulate the rate at which the telemetry packets are acquired from ASPERA-3 instrument,
including multiple telemetry rates.
All command to the instrument will be via the spacecraft serial interface. The interface simulator is a
part of the EGSE. The EGSE will simulate the distribution of synchronisation and timing information.
For the ASPERA-3 experiment there will be two types of data that will be acquired by the EGSE:
housekeeping and science. The science data may contain memory dumps, or other engineering data. For
controlling the Spacecraft Powered Thermistor, a simulator of the Onboard Monitoring System (OMS)
is implemented in the S/C simulator (ADC etc.).
1.6 Stimulator Interface
The ASPERA-3 instrument will not use any external or internal stimuli and due to this there is no
stimuli interface of the EGSE.
1.7 User Interface
The user interface of the EGSE/S is the keyboard, mouse and the monitor’s display. One adequately
sized monitor will be available for tabular and graphical data display. Optionally other bus monitors
may be required, their operation will be supported, but the additional monitors are not part of the EGSE.
The EGSE is capable of displaying decommutated data products from the sensors as the data is being
acquired in real time mode of operation (when the EGSE is directly receiving data from the ASPERA-
3). The EGSE will be capable to analyse data recorded previously, the amount of historical data
available is limited to the amount of temporary data storage available and to the amount of data
accessible via the networks. It will be possible to display replayed plots in conjunction with the real
time data.
There will be capability to execute single commands and data loads from the EGSE. Hazardous
commands shall have an extra level of protection to allow the user extra opportunities to abort sending
them. There will be a capability to execute automatic test sequences by the EGSE, such as data
selection and limit verification, etc.
The EGSE will record in an ASCII file the history of events that occurred during its operation. Any
events that are pertinent to instrument operations shall be logged. Optionally other PCs for monitoring
the data exchange (bus monitors) may be required. Their operation will be supported, but they are not
part of the EGSE.