7.13
Date Code 20100129 Instruction Manual SEL-751A Relay
Communications
SEL ASCII Protocol and Commands
FTP is a standard TCP/IP protocol for exchanging files. A free FTP
application is included with most web browser software. You can also obtain a
free or inexpensive FTP application from the Internet. When you connect to
the relay Ethernet port, you will find files stored in the root (top-level)
directory.
Telnet Server
Use the Telnet session (TPORT default setting is port 23) to connect to the
relay to use the protocols, which are described in more detail below:
➤ SEL ASCII
➤ Compressed ASCII
➤ Fast Meter
➤ Fast Operate
Telnet is a terminal connection across a TCP/IP network that operates in a
manner very similar to a direct serial port connection to one of the relay ports.
As with FTP, Telnet is a part of TCP/IP. A free Telnet application is included
with most computer operating systems, or you can obtain low-cost or free
Telnet applications on the Internet.
Ping Server
Use a Ping client with the relay Ping server to verify that your network
configuration is correct.
Ping is an application based on ICMP over an IP network. A free Ping
application is included with most computer operating systems.
IEC 61850
Use as many as six sessions of MMS over a TCP network to exchange data
with the relay. Use GOOSE to do real-time data exchange with as many as
16 incoming messages and 8 outgoing messages. For more details on the
IEC 61850 protocol, see Appendix F: IEC 61850 Communications.
SEL ASCII Protocol and Commands
Message Format
SEL ASCII protocol is designed for manual and automatic communication.
All commands the relay receives must be of the following form:
<command><CR> or <command><CRLF>
A command transmitted to the relay consists of the command followed by
either a CR (carriage return) or a CRLF (carriage return and line feed). You
can truncate commands to the first three characters. For example, EVENT 1
<Enter> becomes EVE 1 <Enter>. Use upper- and lowercase characters
without distinction, except in passwords.
The relay transmits all messages in the following format:
NOTE: Use the QUIT command prior
to closing the Telnet-to-Host session
to set the relay to Access Level 0.
Otherwise the relay will remain at an
elevated access level until TIDLE
expires.
NOTE: The <Enter> key on most
keyboards is configured to send the
ASCII character 13 (<Ctrl+M>) for a
carriage return. This manual instructs
you to press the <Enter> key after
commands to send the proper ASCII
code to the SEL-751A.
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