AO-13 EVENTS ------------ The following will trigger an AO-13 Event, i.e. create a new Event block, and increment the Event Counter. There are no other instances in the current flight software. Event Cause Safety Information Word (*) --------------------------------------------------------------- EDAC Trigger (Soft Error) Bits 5/6/7 changed Battery Low Volts Bit 8 Set Battery Very Low Volts Bit 9 Set High Temp (T-TX-U, T-TX-L, BCR) Bit 11 Set Excessive Sun Angle Bit 12 Set Earth Sensor Watch see below --------------------------------------------------------------- (*) The Safety Information word is located in Q-block bytes 64-68 in hex-ascii, e.g. 6 "prints" like #0006 which in the block is: #23 #30 #30 #30 #36 1. Battery Low volts: Threshold is 170 in analogue channel #04. 12.72 volts. A second event is recorded when the battery recovers. 2. Battery Very low: Threshold is 156 in analogue channel #04. 11.61 volts. 3. High temp: Threshold is 209 in analogue channels #06, #0E or #25. 52 deg C. 4. Excessive sun angle. Threshold is 100 in analogue channels #14 or #18. Note: Thresholds in items 1-4 are configurable in the flight software, so could change. But unlikely. 5. If the Earth Sensor Watch triggers, two events will be recorded, one from each Earth sensor. Command Stations know when they occur by prior expectation, having invoked the ESWATCH command. At present the uninitiated would have to infer it as none of the other events as per the above was flagged. 6. "Command Loss" (presently set to trigger after 63 orbits command inactivity) sets Bit 10 of the Safety Information Word, but does NOT cause an Event. 7. Bits 8-15 of the "Safety information word" are derived from the flight software variable E-FLAGS: Bit E-FLAGS Reason ---------------------------------------- 0 Battery Low Volts 1 Battery Very Low Volts 2 Command Loss 3 High Temp (T-TX-U, T-TX-L, BCR) 4 Excessive Sun Angle 5 -15 not used ---------------------------------------- This variable is not available directly in the 128 Event telemetry bytes, only indirectly via the Safety Information Word. Example: Q HI, THIS IS AMSAT OSCAR 13 08:35:38 6386 #00CE #0020 #042A 64 13 0 193 17 245 0 Bit 15 12 11 8 7 4 3 0 ----------------------------------------------------------------- #00CE = 0 0 0 0 0 0 0 0 1 1 0 0 1 1 1 0 | | | | | | | | | | | | | | | | +--+--+ | | | | | +--+--+ | | | | +- LIU Off | | | | | | | | | | +- S/A armed +- Not | | | | | | | | +- Rudak off Used | | | | | | | +- Not used | | | | | | +- Command lock none | | | | | +- EDAC = 6 | | | | +- Battery Low ) | | | +- Battery Very Low ) E-FLAGS | | +- Command Loss ) none of these is set | +- High Temp ) +- Ex.Sun Angle ) Notes compiled by James Miller G3RUH AO-13 Command Station. E-mail: g3ruh@amsat.org 1995 Jun 28 [Wed] 2135 utc