Schweitzer Engineering Laboratories SEL-700G Series, Instruction Manual

Page: 477 / 824

7.33
Date Code 20170814 Instruction Manual SEL-700G Relay
Communications
SEL ASCII Protocol and Commands
IDENTIFICATION Command
Use the ID command (see Table 7.26) to extract device identification codes.
IRI Command
Use the IRI command to direct the relay to read the demodulated IRIG-B time
code at the serial port or IRIG-B input (see Table 7.27).
To force the relay to synchronize to IRIG-B, enter the following command:
If the relay successfully synchronizes to IRIG-B, it sends the following header
and access level prompt:
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 7.28 and Table 7.29) to view and manage
the Load Profile report (see Figure 5.15). If there are no stored data and an
LDP command is issued, the relay responds with
No data available
.
Table 7.25 HISTORY Command
Command Description Access Level
HIS Return event histories with the oldest at the bottom
of the list and the most recent at the top of the list. 1
HIS n Return event histories with the oldest at the bottom
of the list and the most recent at the top of the list,
beginning at event n. 1
HIS C or R Clear/reset the event history and all corresponding
event reports from nonvolatile memory. 1
Table 7.26 IDENTIFICATION Command
Command Description Access Level
ID Return a list of device identification codes. 0
Table 7.27 IRI Command
Command Description Access Level
IRI Force synchronization of internal control clock to
IRIG-B time-code input. 1
=> IRI <Enter>
SEL-700G Date: 02/27/2010 Time: 08:56:03.190
GENERATOR RELAY Time Source: external
=>