701 Motor Protection Relay Date Code 20010719
Installation
Relay Connections
2.22
PC, modem, or SEL-2020/2030 Communications Processor. Fiber-optic cable modems
are also available for communication at distances greater than 50 feet (15.2 meters).
Use the SEL-5801 Cable SEL
ECTOR software (available for free download at the SEL
web site, www.selinc.com) to determine the correct metallic or fiber-optic cable for
your particular application. If you prefer to build your own, this software also shows
the cable pinout for metallic cables.
EIA-485 Communication Cables
The SEL-701 Relay is equipped with a rear-panel EIA-485 serial port connector
which operates using Modbus protocol when you enable that feature by relay settings.
Connect the SEL-701 Relay EIA-485 port to a Modbus Master device as shown in
Figure 2.17 on page 2.23.
NOTE: When you enable Modbus protocol for the rear-panel
serial port, the relay disables the EIA-232 serial port and
enables the EIA-485 serial port.
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