Date Code 20110408 Instruction Manual SEL-551 Relay
Section 5
Serial Port Communications
and Commands
Overview
The SEL-551 Relay is equipped with a serial communications port on the rear
panel of the relay. Connect the serial port to a computer serial port for local
communications or to a modem for remote communications. Other devices
useful for communications include the SEL-2032, the SEL-2030, or the
SEL-2020 Communications Processor.
You can use a variety of terminal emulation programs on your personal
computer to communicate with the relay.
The SEL-551 can be ordered with either an EIA-232 or EIA-485 (4-wire)
rear-panel serial port. The default settings for the serial port are:
➤ Baud Rate = 2400
➤ Data Bits = 8
➤ Parity = N
➤ Stop Bits = 1
To change the port settings, use the serial port SET P command (see
Section 4: Setting the Relay) or the front-panel {SET} pushbutton.
Port Connector and Communications Cables
Figure 5.1 Nine-Pin Serial Communications Port Connector
5 4 3 2 1
9 8 7 6
(female chassis connector,
as viewed from outside panel)
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