7.34
SEL-751A Relay Instruction Manual Date Code 20100129
Communications
SEL ASCII Protocol and Commands
Passwords can contain as many as 12 characters. Upper- and lowercase letters
are treated as different characters. Strong passwords consist of 12 characters,
with at least one special character or digit and mixed-case sensitivity, but do
not form a name, date, acronym, or word. Passwords formed in this manner
are less susceptible to password guessing and automated attacks.
Examples of valid, distinct, and strong passwords are shown below:
➤ #0t3579!ijd7
➤ (Ih2dcs)36dn
➤ $A24.68&,mvj
➤ *4u-Iwg+?lf-
PING Command
When you are setting up or testing substation networks, it is helpful to
determine if the network is connected properly and if the other devices are
powered up and configured properly. The PING command (Access Level 2)
allows a user of the relay to determine if a host is reachable across an IP
network and/or if the Ethernet port (Port 1) is functioning or configured
correctly. A typical PING command response is shown in Figure 7.20.
The command structure is:
PING x.x.x.x t
where:
x.x.x.x is the Host IP address and
‘t’ is the PING interval in seconds, with a 2 to 255 second range.
The default PING interval is one second when ‘t’ is not specified. The relay
sends ping messages to the remote node until you stop the PING test by
pressing the ‘Q’ key.
==>>PING 10.201.7.52 <Enter>
Press the Q key to end the ping test.
Pinging 10.201.7.52 every 1 second(s):
Reply from 10.201.7.52
Reply from 10.201.7.52
Reply from 10.201.7.52
Reply from 10.201.7.52
Reply from 10.201.7.52
Reply from 10.201.7.52
Ping test stopped.
Ping Statistics for 10.201.7.52
Packets: Sent = 7, Received = 6, Lost = 1
Duplicated = 0
==>>
Figure 7.20 PING Command Response
Table 7.34 Valid Password Characters
Alpha
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
Numeric
0 1 2 3 4 5 6 7 8 9
Special
! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ ` { | } ~
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