Sel 751A, Instruction Manual

Page: 331 / 640

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.