Date Code 20100129 Instruction Manual SEL-751A Relay
Section 7
Communications
Overview
A communications interface and protocol are required for communicating
with the SEL-751A Feeder Protection Relay. A communications interface is
the physical connection on a device. Once you have established a physical
connection, you must use a communications protocol to interact with the
relay.
The first part of this section describes communications interfaces and
protocols available with the relay, including communication interface
connections. The remainder of the section describes the ASCII commands you
can use to communicate with the relay to obtain information, reports, data, or
perform control functions.
Communications Interfaces
The SEL-751A physical interfaces are shown in Table 7.1. Several optional
SEL devices are available to provide alternative physical interfaces, including
EIA-485, EIA-232 fiber-optic serial port, copper or fiber Ethernet port, single
or dual redundant.
Table 7.1 SEL-751A Communications Port Interfaces
Communications Port Interfaces Location Feature
PORT F EIA-232 Front Standard
PORT 1 Option 1: 10/100BASE-T Ethernet (RJ-45 connector)
Option 2: Dual, redundant 10/100 BASE-T Ethernet (Port 1A, Port 1B)
Option 3: 100BASE-FX Ethernet (LC connector)
Option 4: Dual, redundant 100BASE-FX Ethernet (Port 1A, Port 1B)
Rear Ordering Option
PORT 2
a
Multimode Fiber-Optic Serial (ST
®
connector) Rear Ordering Option
PORT 3 Option 1: EIA-232
Option 2: EIA-485
Rear Ordering Option
PORT 4 Option 1: EIA-232 or EIA-485 Serial Communications Card
Option 2: DeviceNet Communications Card
b
Rear Ordering Option
a
This port can receive the RTD measurement information from the optional external SEL-2600 RTD Module. Refer to the applicable
SEL-2600 RTD Module Instruction Manual for information on the fiber-optic interface.
b
Refer to Appendix G: DeviceNet Communications for information on the DeviceNet communications card.
To Next Page
Loading...
