7.29
Date Code 20100129 Instruction Manual SEL-751A Relay
Communications
SEL ASCII Protocol and Commands
HELP Command
The HELP command (see Table 7.2 0) gives a list of commands available at
the present access level. You can also get a description of any particular
command; type HELP followed by the name of the command for help on
each command.
HISTORY Command
Use the HIS command (see Table 7.21) to view a list of one-line descriptions
of relay events or clear the list (and corresponding event reports) from
nonvolatile memory.
For more information on event reports, see Section 9: Analyzing Events.
IDENTIFICATION Command
Use the ID command (see Table 7.22) 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 7.23).
To force the relay to synchronize to IRIG-B, enter the following command:
=>IRI <Enter>
Ta b le 7 . 2 0 H E L P Co m m a n d
Command Description Access Level
HELP Display a list of each command available at the
present access level with a one-line description.
1
HELP command Display information on the command command.1
Ta b le 7 . 2 1 H I S TO RY Co m m an d
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 7.22 IDENTIFICATION Command
Command Description Access Level
ID Return a list of device identification codes. 0
Table 7.23 IRI Command
Command Description Access Level
IRI Force synchronization of internal control clock to
IRIG-B time-code input.
1
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