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Research Concepts RC2000C User Manual

Page 80

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RC2000C Az/El Tracking Antenna Controller

Appendix A2

Recovering Memory Upsets

Research Concepts, Inc. • 5420 Martindale Road • Shawnee, Kansas • 66218-9680 • USA

www.researchconcepts.com

Appendix A2 - Recovering From Unexpected Memory Upsets

The key to restoring the non-volatile memory is getting the azimuth and elevation limits and position

counts right. The position counts are initialized to 30 when the azimuth CCW and elevation down limits

are set. If the antenna can be unambiguously placed at the azimuth CCW and elevation down limits,

non-volatile memory can be restored quite easily. It is probably a good idea to use a punch or a

waterproof pen to mark the antenna and mount assembly so that the azimuth CCW and elevation down

limit positions can be identified. In addition, it may be useful to identify and mark other places on the

mount where slippage could occur. This would allow the mount to be restored to its original

configuration.

If the contents of non-volatile memory are recorded as outlined in steps 1-4 above, recovery from an

unexpected memory upset can be readily accomplished. If the memory is corrupted, the antenna can

be moved (in LIMITS mode) to the Azim CCW and down limit with the aid of an assistant stationed at

the antenna. Next, steps 7-9 can be used to restore the contents of non-volatile memory.

Note that the procedure for restoring non-volatile memory only works if the count characteristics (counts

per inch for linear actuators) of the actuators are not changed. If the actuator count characteristics are

changed, the count values that correspond to the azimuth CW and elevation up limit will change, as will

the positions of all of the satellites.