7.10
SEL-787 Relay Instruction Manual Date Code 20150130
Communications
Communications Protocols
Communications Protocols
Protocols
Although the SEL-787 supports a wide range of protocols, not all protocols
are available on all ports. In addition, not all hardware options support all
protocols.
Be sure to select the correct hardware to support a particular protocol. For
example, if Modbus
®
TCP is necessary for your application, be sure to order
the Ethernet option for Port 1. Table 7.3 shows the ports and the protocols
available on each port.
SEL Communications Protocols
SEL ASCII. This protocol is described in SEL ASCII Protocol and
Commands on page 7.14.
SEL Compressed ASCII. This protocol provides compressed versions of
some of the ASCII commands. The compressed commands are
described in SEL ASCII Protocol and Commands, and the protocol is
described in Appendix C: SEL Communications Processors.
SEL Fast Meter. This protocol supports binary messages to transfer
metering and digital element messages. Compressed ASCII commands
that support Fast Meter are described in SEL ASCII Protocol and
Commands, and the protocol is described in Appendix C: SEL
Communications Processors.
SEL Fast Operate. This protocol supports binary messages to transfer
operation messages. The protocol is described in Appendix C: SEL
Communications Processors.
SEL Fast SER. This protocol is used to receive binary Sequential Events
Record unsolicited responses. The protocol is described in
Appendix C: SEL Communications Processors.
SEL Event Messenger. This is an SEL ASCII protocol with 8 data bits, no
parity, and 1 stop bit for transmitting data to SEL-3010 Event
Messenger. Only the communications speed is user settable to match
the settings in the SEL-3010.
Table 7.3 Protocols Supported on the Various Ports
Supported Protocol
PORT F SEL ASCII and Compressed ASCII Protocols, SELBOOT, File Transfer
Protocol, Modbus RTU Slave, C37.118 Protocol (synchrophasor data), and
Event Messenger
PORT 1 Modbus TCP/IP, FTP, TCP/IP, IEC 61850, SNTP. DNP3 LAN/WAN, and
Telnet TCP/IP (SEL ASCII, Compressed ASCII, SEL Fast Meter,
SEL Fast Operate, SEL Fast SER)
a
a
PORT 1 concurrently supports two Modbus, two FTP, two Telnet, six IEC 61850, one SNTP, and
three DNP3 LAN/WAN sessions.
PORT 2 All the protocols supported by PORT 3
PORT 3 SEL ASCII and Compressed ASCII Protocols, SEL Fast Meter, SEL Fast
Operate, SEL Fast SER, SEL Settings File Transfer, SEL M
IRRORED BITS,
DNP3, Modbus RTU Slave, C37.118 Protocol (synchrophasor data), and
Event Messenger
PORT 4 All the protocols supported by PORT 3 and DeviceNet
NOTE: FTP, Modbus, and DeviceNet
protocols ignore the hide rules of the
settings.
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