Fundamental Technologies

Galileo Spacecraft Pages

Scanning System Telemetry:

Closed-Loop Mode (Open Loop = 0)
Telemetry (TM) Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Byte 1 Scan Error* Aborted Fast Scan* Emergency Count* *Direction *Centerline

*                       *                    *
Position Code (XYZ)
Byte 2 Emergency Open Loop = 0 Modified Scan Fast Scan Go to Sec-tor "XYZ" X Y Z
Byte 3 Alternate Step Rate

CCW End-Sector Code

 Chicken Mode

CW End-Sector Code
Byte 4

 Number of Invalid Motor Commands
Byte 5 Spare Spare

Step Count

 Cease Scan*

Open-Loop Mode (Open Loop = 1)
Byte 1 Scan Error* Aborted Fast Scan* Emergency Count* *Direction *Centerline

*               *              *
Position Code (XYZ)
Byte 2 Emergency Open Loop = 1 Limited Scan Fast Scan Respond to "XYZ" Triggers X Y Z
Byte 3 Alternate Step Rate

Not Used
Byte 4

Number of Invalid Motor Commands
Byte 5 Spare Spare

Step Count

 Cease Scan*

*These bits are assumed to be sampled every 4/3 second. All other bits may be sampled once a minute.

Return to EPD Flight Software System Documentation table of contents page.
Return to Galileo EPD Handbook Table of Contents page.
Return to Fundamental Technologies Main Galileo Page.
Return to Fundamental Technologies Home Page.

Updated 9/2/04, T. Hunt-Ward
tizby@ftecs.com