Schweitzer Engineering Laboratories SEL-749M, Instruction Manual

Page: 158 / 314

7.10
SEL-749M Relay Instruction Manual Date Code 20080918
Communications
SEL ASCII Protocol Details
process the ASCII command. Usually, most terminals and terminal programs
interpret the Enter key as a
<CR> . For example, to send the ACCESS
command, type ACC <Enter> .
Tables in this section show the access level(s) where the command or
command option is active. Access levels in this device are Access Level 0,
Access Level 1, and Access Level 2.
Access Commands (ACCESS and 2ACCESS)
The ACC and 2AC commands provide entry to the multiple access levels.
Different commands are available at the different access levels, as shown in
the
SEL-749M Relay Command Summary at the end of this manual.
Commands ACC and 2AC are explained together because they operate
similarly. See Access Levels on page U.7.7 for a discussion of placing the
relay in an access level.
Password Requirements
Passwords are required if they are not disabled. See PASSWORD Command
(View/Change Passwords) on page U.7.19 for the list of default passwords and
for more information on changing and disabling passwords.
Access Level Attempt (Password Required)
Assume the following conditions:
➤
Access Level 1 password is not disabled.
➤
Access Level is 0.
At the Access Level 0 prompt, enter the ACC command:
=
ACC <Enter>
Because the password is not disabled, the relay prompts you for the Access
Level 1 password:
Password: ? @@@@@@@@
The relay is shipped with the default Access Level 1 password shown in
PASSWORD Command (View/Change Passwords) on page U.7.19 . At the
prompt, enter the default password and press the <Enter> key. The relay
responds with the following:
[RID Setting] Date: mm/dd/yyyy Time: hh:mm:ss.sss
[TID Setting] Time Source: external
Level 1
=>
The
=>
prompt indicates the relay is now in Access Level 1.
Table 7.6 Access Commands
Command Description Access Level
ACC Moves from Access Level 0 to Access Level 1. 0
2AC Moves from Access Level 1 to Access Level 2. 1
Courtesy of NationalSwitchgear.com