Schweitzer Engineering Laboratories SEL-421-4 - Page 1249

14.43
Date Code 20171006 Instruction Manual SEL-400 Series Relays
ASCII Command Reference
Command Description
Relay access levels that have passwords are 1, B, P, A, O, 2, and C. Valid pass-
words are character sequences of as many as 12 characters. Valid characters are
any printable ASCII character. HMI password entry is limited to upper- and
lowercase letters, numbers, underscore, and period, so you must limit your pass-
word to these characters if you need to do privileged operations from the front panel.
All passwords are case sensitive. When you successfully enter a new password,
the relay pulses the Relay Word bit SALARM for one second, and responds,
Set.
PAS level DISABLE
Issuing the PAS level DISABLE command disables password checking for the
specified access level. You must type DISABLE in upper case.
When you successfully disable password checking, the relay pulses the
SALARM Relay Word bit for one second, and responds,
Password Disabled.
SEL does not recommend disabling passwords.
PING
Use the PING command to determine whether the network is connected properly
and other network devices are reachable.
When the IP address parameter is not of a valid format, the relay responds with
Invalid IP address. After a valid PING command is issued, the relay sends out
an ICMP echo request messages at one second intervals until receiving a carriage
return <CR> or five minutes elapses. A sample PING command response is
shown in Figure 14.8.
Ta b l e 1 4.9 9 PA S level DISABLE Command
Command
a
a
Parameter n represents the relay Access Levels 1, B, P, A, O, or 2.
Description Access Levels
PAS n DISABLE Disable password protection for the Access Level n.2
Table 14.100 PING Command
Command Description Access Level
PING addr
a
a
IP address of device to ping in the format of four decimal numbers (0–255) separated by periods.
Send ICMP echo request messages to remote device at addr. 1, B, P, A, O, 2
=>>PING 192.9.201.1 <Enter>
Pinging 192.9.201.1
Press <Enter> to Terminate Ping Test.
Ping Echo Message Received.
Ping Echo Message Received.
Ping Echo Message Received.
Ping Echo Message Received.
Ping Results:
Number of Ping Messages:
Transmitted: 4
Received: 4
Elapsed Time: 11 seconds
=>>
Figure 14.8 Sample PING Command Response