7.11
Date Code 20100129
Instruction Manual
SEL-751A Relay
Communications
Communications Protocols
Communications Protocols
Protocols
Although the SEL-751A 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
.
shows the ports and the protocols
available on each port.
SEL Communications Protocols
SEL ASCII.
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
, and the protocol is described in
.
SEL Fast Operate.
This protocol supports binary messages to transfer
operation messages. The protocol is described in
.
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
PORT
Supported Protocol
PORT F
SEL ASCII and Compressed ASCII Protocols, SEL
BOOT
, File Transfer Proto-
col, Modbus RTU Slave, C37.118 Protocol (synchrophasor data), and Event
Messenger
PORT 1
Modbus TCP/IP, FTP, TCP/IP, IEC 61850, DNP3 LAN/WAN, and Telnet
TCP/IP (SEL ASCII, Compressed ASCII)
a
a
PORT 1 concurrently supports two Modbus, three DNP3 LAN/WAN, two FTP, two Telnet, and
six IEC 61850 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
B
ITS
,
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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