Date Code 20110408 Instruction Manual SEL-551 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 a long 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-551.
Message Lists
Table D.1 Binary Message List
Request to Relay (hex) Response From Relay
A5C0 Relay Definition Block
A5C1 Fast Meter Configuration Block
A5D1 Fast Meter Data Block
A5C2 Demand Fast Meter Configuration Block
A5D2 Demand Fast Meter Data Message
A5C3 Peak Demand Fast Meter Configuration Block
A5D3 Peak Demand Fast Meter Data Message
A5B9 Fast Meter Status Acknowledge
A5CE Fast Operate Configuration Block
A5E0 Fast Operate Remote Bit Control
A5E3 Fast Operate Breaker Control
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