Schweitzer Engineering Laboratories SEL-787, Instruction Manual

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7.24
SEL-787 Relay Instruction Manual Date Code 20081022
Communications
SEL ASCII Protocol and Commands
If the relay successfully synchronizes to IRIG-B, it sends the following header
and access level prompt:
SEL-787 Date: 12/10/2007 Time: 08:56:03.190
TRNSFRMR 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 5.15 ). 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
progression 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 overwritten. 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.