7.30
SEL-751A Relay Instruction Manual Date Code 20100129
Communications
SEL ASCII Protocol and Commands
If the relay successfully synchronizes to IRIG-B, it sends the following header
and access level prompt:
SEL-751A Date: 12/10/2003 Time: 08:56:03.190
FEEDER RELAY Time Source: external
=>
If no IRIG-B code is present at the serial port input or if the code cannot be
read successfully, the relay responds with
IRIG-B DATA ERROR.
If an IRIG-B signal is present, the relay synchronizes its internal clock with
IRIG-B. It is not necessary to issue the IRI command to synchronize the relay
clock with IRIG-B. Use the IRI command to determine if the relay is properly
reading the IRIG-B signal.
LDP Command (Load Profile Report)
Use the LDP commands (see Table 7.24 and Table 7.25) to view and manage
the Load Profile report (see Figure 5.14). If there is no stored data and an LDP
command is issued, the relay responds with
No data available.
L_D Command (Load Firmware)
Use the L_D command (see Table 7.26) to load firmware. See Appendix A:
Firmware and Manual Versions for information on changes to the firmware
and instruction manual. See Appendix B: Firmware Upgrade Instructions for
further details on downloading firmware.
Table 7.24 LDP Commands
Command Description Access Level
LDP row1 row2
LDP date1 date2
Use the LDP command to display a numeric pro-
gression of all load profile report rows. Use the LDP
command with parameters to display a numeric or
reverse numeric subset of the load profile rows.
1
LDP D Use this command to display the maximum number
of days of data the feeder relay can acquire with the
present settings, before the oldest data is overwrit-
ten.
1
LDP C Use this command to clear the load profile report
from nonvolatile memory.
1
Table 7.25 LDP Command Parameters
Parameter Description
row1 row2 Append row1 to return a chronological progression of the first row1
rows. Append row1 and row2 to return all rows between row1 and
row2, beginning with row1 and ending with row2. Enter the smaller
number first to display a numeric progression of rows through the
report. Enter the larger number first to display a reverse numeric
progression of rows.
date1 date2 Append date1 to return all rows with this date. Append date1 and
date2 to return all rows between date1 and date beginning with
date1 and ending with date2. Enter the oldest date first to display a
chronological progression through the report. Enter the newest date
first to display a reverse chronological progression. Date entries are
dependent on the date format setting DATE_F.
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