Date Code 20060320 Instruction Manual SEL-311C Relay
Appendix D
Configuration, Fast Meter,
and Fast Operate Commands
Overview
SEL relays have two separate data streams that share the same serial port. The
human data communications with the relay consist of ASCII character
commands and reports that are intelligible to humans using a terminal or
terminal emulation package. The binary data streams can interrupt the ASCII
data stream to obtain information and then allow the ASCII data stream to
continue. This mechanism allows a single communications channel to be used
for ASCII communications (e.g., transmission of an event report) interleaved
with short bursts of binary data to support fast acquisition of metering data.
The device connected to the other end of the link requires software that uses
the separate data streams to exploit this feature. The binary commands and
ASCII commands can also be accessed by a device that does not interleave the
data streams.
SEL Application Guide AG95-10: Configuration and Fast Meter Messages is
a comprehensive description of the SEL binary messages. Below is a
description of the messages provided in the SEL-311C Relay.
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