GE EPM 9650/9800 manual Format Description

Byte	Format	Range	Description
0	Binary	0-99	Century
1	Binary	0-99	Year
2	Binary	1-12	Month
3	Binary	1-31	Day
4	Binary	0-23	Hour
5	Binary	0-59	Minute
6	Binary	0-59	Second
7	Binary	0-99+MSB	Centisecond

Limit Data Pointers (45077-45204): These Registers indicate which values are being monitored by Limits. Each Data Pointer has the following 8-byte structure:

Size	Format	Description
2-byte	Unsigned Integer	Line Number
1-byte	Unsigned Char	Point Number
1-byte	Unsigned Char	Limit Mode
2-byte	Unsigned Integer	Comparison 1 Value
2-byte	Unsigned Integer	Comparison 2 Value

A Line Number is an index into the Communication Table. Example: Line Number 11 is for the 12th Line in the Communication Table, 0.1 Second Phase-to-Neutral Voltages. Data Pointers with Line Numbers greater than the number of lines in the table are ignored.

A Point Number is an index into a Line in the Communication Table. Example: Point Number 1 is for the second entry in a Line. Line Number 11, Point Number 1 is the 2nd in the 12th line, 0.1 Second VBN. Data Pointers with Point Numbers greater than the number of points for the line are ignored.

Latched Exception Flag (41105): This Register tells you how many Limit Triggers have occurred since the last time the Registers were checked. This Register is Read Only.

Example: Two Limit Exceptions occurred. Read the Register from Port 1; you will notice 2 Limit Exceptions returned. Later, two more Limit Exceptions occurred. Read the Register again. From Port 1, you will notice 2 Limit Exceptions returned. From Port 2, you will notice 4 Limit Exceptions returned. Limit Exceptions are incremented so that you have a history of Limit Exceptions in the Ports.

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