H 1

1
MEIDEX - Crew TutorialSoftwareAdam D. Devir,
MEIDEX Payload Manager
2
The PGSC4130 Software

• The PGSC4130 Software
• The PGSC Operator Display
• Main Page Menu
• Command Generator Display
• Relay Commanding Display
• Truss Control display
• Secondary Page Menu
• Xybion Command Display
• Digital Telemetry Display
• Temperature Display
• Additional page Menu
• Xybion Telemetry Display
• EU Data Display

3
The PGSC4130 Flight Software
The MEIDEX Software Package consists of two
Computer Software Configuration Items (CSCIs)
which execute in a master/slave configuration.
The master CSCI resides on the Payload and
General Support Computer (PGSC). It provides the
capability to setup, monitor, and control the
experiment. An alternate command and control
capability will be available via the remote PGSC
in the Payload Operations Control Center (POCC).
The PGSC in the POCC is also referred to as
Customer Ground Support Equipment (CGSE). The
slave CSCI resides in the CDH electronics and
responds to commands/requests from the PGSC to
control the experiment and to telemeter the
experiments health and status.
4
PGSC Operator Interface
When the PGSC software is started the PGSC
Operator Interface is displayed. The red and
yellow limit violations are in the current
telemetry packet. The PGSC is operated by a
series of menu and button controls that are
spread at the top of the screen. By pressing the
OpenComm the PGSC communication port is open
(green) and shut (red). This button can be
activated by Comm Control Pressing the AutoTlm
toggles automatic generation of telemetry request
command green is for request enable and red is
for request not enable. Pages opens 17
secondary window displays through which the
operator can control the payload and get the
status of different functions of the payload
instrumentation. 10 of these windows can be
opened by the buttons in the second row of this
window. The most important windows displays will
be described herein.
5
Main Page Menu Initiation
6
Command Generator Display Description
The left scrolling display allows the operator to
select a command. The command and parameter(s)
selected by the operator will appear in the
command buffer display below the scrollable
displays. The XMIT control Forwards the
command buffer to the communication port. The
CLEAR control clears the command
buffer. Commands and parameter values may also
be entered manually in the command buffer display.
7
Command Generator Display Initiation
The control of the payload from either the
Orbiter PGSC or the POCC PGSC cannot be initiated
until one of these two PGSC (the Master) takes
over the control signifying to the second PGSC
(the slave) that the control is in the other
hands. This is done by scrolling to
IMTAKINGOVER and clicking XMIT. By this
command the master PGSC can initiate its control
over the payload.
8
Command Generator Display Continued
Commands and parameter(s) value(s) may also be
entered manually in the command buffer display.
For example, the Configuration of the Date in
the Xybion camera can be set by entering the
Month, Day and Year settings.
9
Command Generator Display Continued
Commands and parameter(s) value(s) may also be
entered manually in the command buffer display.
For example, the Configuration of the Time in
the Xybion camera can be set by entering the
Hour, Minute and Seconds (00) settings. The
XMIT will be clocked two seconds before the
next minute.
10
Command Generator Display Important Commands
The following commands are currently defined as
operationally important in the PGSC
configuration file IMTAKINGOVER CHD_RESET PSWLIMI
T NSWLIMIT OVERCURRENTLIMIT When an Operationally
Important command is selected from the Command
Generator Display and transmit control clicked,
the operator will be shown the confirmation
dialog illustrated. Click OK transmit the
command For PSWLIMIT and NSWLIMIT see -
Truss Pointing Display. OVERCURRENT value is
set by OSC to be 2.5Amp. (See CDR) - motor stall
current is 5.2Amp.
11
Command Generator Display Relay List
12
Command Generator Display CMD List
13
Command Generator Display CMD List Continued
14
Command Generator Display CMD List Continued
15
Relay Commanding Display
This display provides a quick means to command
the experiment electric relays without going to
the command generator display. To select a
command, place the cursor on it and press the
mouse left button. The command selected will
appear highlighted in green above the Xmit
button. The command will be executed by pressing
the Xmit button. The switch-position light (to
the right of the relay command pairs) will turn
green if the corresponding relay is closed.
16
Truss Pointing Display

• This displays provides a visual presentation of
• Camera truss orientation
• Truss telemetry information
• Command window to transmit truss pointing
  commands.
• Telemetry points provide truss motor power,
  current and temperature, limit switch position
  indication, slew count and direction, software
  stop, truss status and truss angle parameters.
• Slew commands are entered in the red truss
  commanding box as direction (/-) and the
  relative truss angle (in degrees) to slew.
• The camera truss orientation gives a visual
  depiction of the truss position in relation to
  the -Z direction

17
Truss Pointing Display Continued

• The truss slew rate is 1 degree/sec.
• The truss point command is actually two commands
  sent sequentially
• The first command is a set direction relay
  command, which sets the direction of movement
  (via RELAYK15)
• The second command is the counts command which
  contains a two byte integer which indicates to
  the CDH during how many 0.1 second counts it
  will apply power to the truss. The set
  direction command will not be executed if a
  truss movement is ongoing.
• The counts command will not be executed unless
  a set direction command has been received
• The control of the motion of the truss is through
  a series of counts where each count corresponds
  to 0.1 seconds of motor motion. The CDH controls
  the number of these counts.

18
Truss Pointing Display Continued

• The truss slew rate is 1 degree/sec
• The truss has four stop settings
• A mechanical stop that stops the truss at ? 30
  degrees
• A hardware stop (micro switch) that kills the
  motor current (and changes its direction) when
  mechanically triggered (exceeded) at ? 27 degrees
• A software stop() that stops the truss at ? 25
  degrees. If these stops are exceeded the CDH
  stops the motor power.
• A command stop() that stops the truss motion at
  ? 21 degrees. The CDH validate truss pointing
  commands to verify that motion past the software
  stops (? 25 degrees) will not be exceeded - a
  command past the software stop will be discarded.
• The CDH removes power from the truss motor in
  the event of a motor over current condition
• () The software stops commands (PSWSTOP and
  NSWSTOP) (see the Command Generator Display)
  write new values to the upper(positive) and lower
  (negative) software stops of the truss motor
  assembly. Each command has one parameter the
  upper or lower stop values (0-255 counts
  converted from degrees input by the operator)
  where each count is 0.1sec (or 0.1degree) of
  truss motion.
• () The software limit commands (PSWLIMIT and
  NSWLIMIT) (see the Command Generator Display)
  write new values to the upper(positive) and lower
  (negative) software limits of the truss motor
  motion

19
Secondary Page Menu
20
Xybion Command Display
This display provides the primary operations
interface for the Xybion camera. To select a
command to the Xybion camera, click on the
command name. Enter the parameter value (if the
command has a parameter). Click the Xmit button
to send the command. The report transfers the
Xybion flight data setting into the telemetry
stream either in text format or in encoded format

21
Xybion Command Display Continued
In MEIDEX the Xybion camera will always be
operated in the Peak Video Mode. However, to
avoid saturation (GL gt255) it was found that the
configuration of the Peak Video Level (PVL) has
to be lower than 250 and its value strongly
depends on the area of the ROI that will take the
peak (the maximal) radiance level. T
his data is very important especially in case of
sprites or small clouds or land features
(islands) that may be saturated if the PVL is not
properly set.
22
Digital Telemetry Display
This page displays the status of all bi-level
telemetry points in telemetry packet. Green
button lights on the digital display generally
represent ON or safe/normal condition.White
lights are OFF or unsafe/not normal. The bars
below the VCR panels represent the progress bars
for the VCR tape usage. As the VCR records
images, the elapsed seconds display updates. In
the event that the PGSC is interrupted, the
progress bar may be re-synchronized by entering
down the time difference in the elapsed offset
space. To enable this feature, select the Use
Offsets control.
23
Temperature Display
This display shows the temperatures (C) of
several key experiment monitoring points as
measured by thermistors (-20C to 80C accuracy
?1C).The thermistor locations are The CDH box
(on one of the 4 boards located in it). The three
VCRs. Thermostat 1 - located near the thermostat
1 (of heater 1) just above the video
buffer. Thermostat 2 - located on the bracket of
heater 2 (below the window). Thermostat 3 -
located on thermostat plate on the Avionics
Mounting Plate (AMP) located 6 above the Lower
End Plate (LEP). Near the motor brake. In the
Electronic Power System (EPS) - on buss A. In the
EPS - on buss B. On the heat exchange fins of
heater 1 - above the video buffer. On the heat
exchange fins of heater 2 - below the window.
24
The Down-Stairs Wisdom Syndrome
25
Thermistor Locations ( )
Thermostat 1 (above the buffer)
Heater 1 (on fins)
Video Buffer
Sekai CCD P/S
Electrical Power System (EPS) (on the 2 buss
boards)
Thermostat 3 (On Thermostat plate mounted on the
AMP)
CDH Enclosure (on one of the 4 buss boards)
Junction Box
Avionics Mounting Plate (AMP)
Sekai ADVCRs
Lower End Plate (LEP)
26
Thermistor Locations ( )
Thermostat 2 (on fan bracket)
Heater 2 (on fins)
27
Thermistor Locations ( )
28
Additional Page Menu
29
Xybion Camera Telemetry Display
The Xybion camera telemetry display displays the
Xybion camera flight data text block in response
to a Xybion camera telemetry request. There will
be an interruption in the normal telemetry stream
of 3-4 cycles when Xybion camera telemetry is
processed. The content of the Xybion flight
data text block is Firmware version number Time
and date stamp Frame count CCD temperature
(degrees Centigrade) Filter position and filter
locked flag Current video level Auto Exposure
Mode Peak and Average Target Levels Current
exposure time and mode Manual exposure list Index
filter number indices Intensifier gain readout
and setting IRIG board present flag IRIG
mode Internal clock synchronization flag IRIG code
30
EU Data Display
The EU (Engineering Units) telemetry display
shows the telemetry data in converted and limit
form. Parameters exceeding red or yellow limit
violation are displayed in yellow or red
type. The display contains all telemetry
parameters and updates every 8 seconds.
31
ENDCrew Tutorial - Software