3.4
SEL-400 Series Relays Instruction Manual Date Code 20171006
Basic Relay Operations
Establishing Communication
You can truncate commands to the first three characters: EVENT 1 becomes EVE 1.
Use upper- and lowercase characters without distinction, except in passwords,
which are case sensitive. For a list of ASCII commands see Section 14: ASCII
Command Reference.
Help
When you are using a terminal, you can access built-in relay help for each ASCII
command. Relay help is access-level sensitive; you see only the ASCII com-
mands for the present access level when you type HELP <Enter>. For in-depth
information on a particular ASCII command, enter the command name after typ-
ing HELP. For example, for help on the EVENT ASCII command, type
HELP EVE <Enter>.
When you are using QuickSet, press <F1> to get help, or select the Help menu
from the QuickSet toolbars. The help information in QuickSet gives detailed
information and sample screens in a GUI format.
Making an EIA-232 Serial Port Connection
The following steps use any popular computer terminal emulation software and
SEL serial cables to connect to the relay.
Use an SEL-C234A cable to connect a 9-pin computer serial port to the relay.
Use an SEL-C227A cable to connect a 25-pin computer serial port to the relay.
For computers with USB ports, use an SEL-C662 USB-to-serial cable to connect
to the relay. See Section 15: Communications Interfaces for further information
on serial communications connections. These and other cables are available from
SEL. Contact the factory or your local distributor for more information.
Step 1. Use the serial cable to connect the computer to the relay via PORT F
on the relay front panel.
Step 2. Apply power to both the computer and to the relay.
Step 3. Start the computer terminal emulation program.
Step 4. Set your computer terminal emulation program serial communica-
tions parameters.
The default relay communications port settings are listed in
Table 3.1.
Also set the terminal program to emulate either VT100 or VT52
terminals. These terminal emulations work best with SEL relays.
Table 3.1 General Serial Port Settings
Name Description Default
PROTO Protocol (SEL, DNP, MBA, MBB, RTD, PMU) SEL
SPEED Data speed (300 to 57600, SYNC) 9600
DATABIT Data bits (7, 8 bits) 8
PARITY Parity (Odd, Even, None) N
STOPBIT Stop bits (1, 2 bits) 1
RTSCTS Enable Hardware Handshaking (Y, N) N
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