15.2
SEL-400 Series Relays Instruction Manual Date Code 20171006
Communications Interfaces
Serial Communication
Serial Communication
Each relay has four serial ports that you can use for serial communication with
other devices. While these ports are all EIA-232, you can add transceivers or con-
verters to operate on different physical media including EIA-485 and fiber-optic
cable.
EIA-232 Interfaces
The relay has four EIA-232 communications interfaces. The serial port locations
for the 4U chassis are shown in Figure 15.1, Figure 15.2, and Figure 15.3; other
chassis sizes are similar. The port on the front panel is PORT F and the three rear-
panel ports are PORT 1, PORT 2, and PORT 3.
IEC 61850 Ethernet Section 17: IEC 61850
Communication
M
IRRORED BITS
Communications
EIA-232
a
SEL MIRRORED BITS Communi-
cation on page 15.31
Phasor Measurement Proto-
cols (C37.118 and SEL Fast
Message)
EIA-232
a
Ethernet
b
Section 18: Synchrophasors
PTP Ethernet Precision Time Protocol (PTP)
on page 15.15
SEL Binary Protocols (Fast
Meter, Fast Operate, Fast
SER)
EIA-232
a
or Telnet using
Ethernet
SEL Fast Meter, Fast Operate,
Fast SER Messages, and Fast
Message Data Access on
page 15.28
SEL Fast Message RTD
Protocol
EIA-232
a
SEL Fast Meter, Fast Operate,
Fast SER Messages, and Fast
Message Data Access on
page 15.28
SNTP Ethernet Simple Network Time Protocol
(SNTP) on page 15.13
Telnet Ethernet Telnet on page 15.13
a
You can add converters to transform EIA-232 to other physical interfaces.
b
Phasor Measurement over the Ethernet card is only C37.118 protocol.
Table 15.1 Relay Communications Protocols (Sheet 2 of 2)
Communications Protocol Communications Interface For More Information See
Figure 15.1 Relay 4U Chassis Front-Panel Layout
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