Using BREF/FREF with the RANGE value

If RANGE is the only parameter you specify, the FREF and BREF commands use the TIME value currently displayed on the top of the screen. The FREF command uses the TIME value as the beginning time of the new report and adds the RANGE value you specify to obtain the report interval. The BREF command uses the end time of the current report interval (TIME plus RANGE value displayed at the top of the screen) and subtracts the RANGE value you specify to obtain the beginning time of the new report interval.

Using BREF and FREF by specifying only a RANGE value allows you to include in the report interval data from the current report interval indicated by TIME and RANGE at the top of the screen. With BREF, you can access data in a previous interval as well as the current interval; with FREF, you can access data in a later interval as well as the current interval. For example, if the current RANGE and MINTIME values are 100 seconds, and the TIME on the top of the display screen is 9:00:00, then RMF displays a report containing data from 9:00:00 to the TIME + RANGE value at the top of the screen, which would be 9:01:40. To view data from a previous interval, as well as the currently displayed interval (9:00:00 to 9:01:40), specify BREF R=200. RMF presents a report containing data from 8:58:20 to 9:01:40. (8:58:20 being the TIME + RANGE value at the top of the screen minus 200.) To include one more preceding interval, specify BREF R=300 to present data from 8:56:40 to 9:01:40. If you want to display data only from the current interval again (9:00:00 to 9:01:40), shorten the range parameters on the command to 100 seconds (BREF R=100).

Using the FREF command you can display reports containing data from subsequent intervals. For example, specify FREF R=200 to display a report containing data from 9:00:00 to 9:03:20.

If you specify RANGE=0 with the date and/or time, you can pinpoint the time at which you want to start viewing data. RANGE=0 causes RMF to adjust the range to the smallest possible value, which is the MINTIME value you specified in the data gatherer options. If you want to begin viewing the report at the TIME value on the display screen and you specify BREF or FREF, you must specify RANGE = 0.