Date Code 20080110 Communications 7-1
SEL-387E Instruction Manual
SECTION 7: COMMUNICATIONS
O
VERVIEW
The SEL-387E Relay provides:
• Communications with EIA-232 and EIA-485 serial ports
• Communications with Ethernet ports
A communications interface and protocol are required for communicating with the relay. A
communications interface is the physical connection on a device. Serial ports that conform to
the EIA-232 standard (often called RS-232) use DB-9 or DB-25 connectors as the physical
interface, whereas Ethernet ports use RJ-45, ST, or LC connectors as the physical interface.
Once a physical connection has been established, use a communications protocol to interact with
the relay. A communications protocol is a language used to perform operations and collect data.
E
THERNET
I
NTERFACES
Physical Layer Options
The SEL-387E provides optional Ethernet ports with two physical layer options. Only one port
is supported at this time but the other port can be enabled with a future firmware upgrade. The
physical layer options are the following:
• Two 10/100BASE-T ports that support 10/100 Mbps rates on RJ-45 connectors
• Two 100BASE-FX ports that support 100 Mbps rates on LC connectors
Indicators
The green LED is on when the link is operational. The red LED blinks when there is transmit or
receive activity.
Cables
The following Ethernet cables are compatible with the SEL-387E.
SEL Part No. Length Description
240-1570 1 M Duplex Fiber Cable LC/ST
240-1571 5 M Duplex Fiber Cable LC/ST
240-1572 15 M Duplex Fiber Cable LC/ST
240-1573 1 M Duplex Fiber Cable LC/LC
240-1574 5 M Duplex Fiber Cable LC/LC
To Next Page
Loading...
