Sel 751A - Ethernet Port; Fiber-Optic Serial Port; IRIG-B Time-Code Input

2.18
SEL-751A Relay Instruction Manual Date Code 20100129
Installation
Rear-Panel Connections
The serial port EIA-485 plug-in connector accepts wire size AWG 24 through
AWG 12. Strip the wires 8 mm (0.31 inches) and install with a small slotted-
tip screwdriver. All EIA-232 ports accept 9-pin D-subminiature male
connectors.
For connecting devices at distances over 100 feet, where metallic cable is not
appropriate, SEL offers fiber-optic transceivers or the fiber-optic port. The
SEL-2800 family of transceivers provides fiber-optic links between devices
for electrical isolation and long-distance signal transmission. Contact SEL for
further information on these products.
IRIG-B Time-Code Input
The SEL-751A accepts a demodulated IRIG-B time signal to synchronize the
internal clock with an external source. Three options for IRIG-B signal input
are given, but only one should be used at a time. IRIG-B (B01 and B02) inputs
or an SEL communications processor via EIA-232 serial Port 3 may be used.
The available communications processors are the SEL-2032, SEL-2030,
SEL-2020, and the SEL-2100 Logic Processor.
The models with fiber-optic Ethernet and dual copper Ethernet do not have the
terminals B01 and B02 for IRIG-B but have IRIG-B input via EIA-232 Port 3.
The third option for IRIG-B is via fiber-optic serial Port 2. Use an
SEL-2812MT Transceiver to connect to the SEL-2030 or SEL-2032 and bring
IRIG-B signal with the EIA-232 input. Use a fiber-optic cable pair with ST
connectors (C805 or C807) to connect to the Port 2 on the SEL-751A. Refer to
Section 7: Communications for details on IRIG-B connections examples and
on SEL-2401/2407/2404 for time source.
Ethernet Port
The SEL-751A can be ordered with an optional single/dual 10/100BASE-T or
100BASE-FX Ethernet port. Connect to Port 1 of the device using a standard
RJ-45 connector for the copper port and an LC connector for the fiber-optic
port.
Fiber-Optic Serial Port
The optional fiber-optic serial port is compatible with the SEL-2812 (with
IRIG-B) or the SEL-2814 Fiber-Optic Transceivers and the SEL-2600 RTD
Module.