GE EPM 9650/9800 manual Downloading Time Stamps with Examples, Address Description Example Value

15.Read Window from the beginning up to (but not including) the ending offset.

16.Un-pause the log by writing FFFFH to the Log Window Index Register.

5.1.2: Downloading Time Stamps with Examples

The following steps detail the process for downloading time stamps from a log, using values from Historical Log 1 as an example.

1.Read the EPM Programmable Settings Block (Registers 45057–53248).

2.Pause the log by writing an initial, non-FFFFH value to the Log Window Index Register. Example: Write 0000H to the Window Index for Historical Log 1, Register 38145.

3.Read and store the Log Header information.

Example: Historical Log 1 Snapshot Header
Address	Description		Example Value
36865–36866	Historical Log 1 Snapshot Memory Size		1851392
36867	Historical Log 1 Snapshot Record Size		64
36868	Historical Log 1 Snapshot First Index		501
36869	Historical Log 1 Snapshot Last Index		500
36870–36873	Historical Log 1 Snapshot First Time Stamp		7/10/99 12:32:00.000
36874–36877	Historical Log 1	Snapshot Last Time Stamp	7/30/99 14:40:00.000
35878–36881	Historical Log 1	Snapshot Valid Bitmap	FFFC 0000
36882	Historical Log 1	Snapshot Max Records	28928

4.Determine the starting Window Index and starting Window Offset using these formulas: Starting Window Index = Int([8 x First Index]/128).

Starting Window Offset = (8 x First Index) % 128.

Example:

Starting Window Index: Int (8 x 501/128) = Int (31.3125) = 31.

Starting Window Offset: (8 x 501) % 128 = 40.

5.Determine the largest Window Index and the largest Window Offset using these formulas: Largest Window Index = Int ([8 x Max Records]/128).

Largest Window Offset = (8 x Max Records) % 128.

Example:

Largest Window Index = Int([8 x 28928]/128) = Int(1808) = 1808 Largest Window Offset = (8 x 28928) % 128 = 0

6.Determine the ending Window Index and the ending Window Offset using these formulas: Ending Window Index = Int([8 x {Last Index + 1}]/128)

Ending Window Offset = (8 x [Last Index +1]) % 128

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