Sel SEL-421 - Serial Communication; Eia-232; SEL-421 3 U Chassis Front-Panel Layout

R.4.2
SEL-421 Relay Reference Manual Date Code 20111215
Communications Interfaces
Serial Communication
Section 6: SEL Communications Processor Applications in the Applications
Handbook and Section 7: Direct Network Communication in the Applications
Handbook include more information on communication topologies and
protocols.
Serial Communication
Each SEL-421 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 converters to operate on different physical media including
EIA-485 and fiber-optic cable.
EIA-232
The SEL-421 has four EIA-232 communications interfaces. The serial port
locations for the 3U chassis are shown in Figure 4.1 and Figure 4.2; 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.
Figure 4.1 SEL-421 3U Chassis Front-Panel Layout
SEL Binary Protocols
(Fast Meter, Fast Operate,
Fast SER)
EIA-232
a
or Telnet using
Ethernet card
Section 5: SEL Communi-
cations Protocols
SEL Fast Message RTD
protocol
EIA-232
a
Section 5: SEL Communi-
cations Protocols
M
IRRORED BITS
®
commu-
nications
EIA-232
a
Section 5: SEL Communi-
cations Protocols
Phasor Measurement
Protocols (C37.118 and
SEL Fast Message)
EIA-232
a
Ethernet Card
b
Section 7: Synchrophasors
ASCII Commands EIA-232 or Telnet using
Ethernet card
a
Section 9: ASCII Command
Reference
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 4.1 SEL-421 Communications Protocols (Sheet 2 of 2)
Communications
Protocol
Communications Interface For More Information See
Port F