Sel SEL-DTA2, Instruction Manual

Page: 26 / 44

3.4
SEL-DTA2 Instruction Manual
Date Code 20020329
Communications
Command Characteristics
Command Characteristics
Access Levels
A multi-level password system provides security against unauthorized access.
There are three access levels:
Access Level 0.
On power-up the SEL-DTA2 is in Access Level 0 and
honors only the ACCESS command, which moves to Access Level 1.
The SEL-DTA2 responds “Invalid Command” or “Invalid Access
Level” to any other entry.
Access Level 1.
Allows access to only those commands listed under
Access Level 1 in Figure 3.1 .
Access Level 2.
Allows access to PASSWORD and SET commands plus
all commands at lower levels.
This access scheme allows you to give personnel access to only those
functions they require. Each level has an associated screen prompt and
password.
Figure 3.1 shows the access levels, passwords, prompts, commands
available at each level, and commands that move you between access levels.
The SEL-DTA2 and the connected relay must have identical passwords in
order to retrieve data from the relay.
Figure 3.1 Access Level Relationships
Start-up
Immediately after power is applied, the instrument transmits the following
message to communications Port 1:
SEL-DTA Display/Transducer Adapter Date: 1/1/91 Time: 01:01:01
SEL-DTA
=
Access Level
Prompt 0
= 1
=> 2
=>>
ACCESS LEVEL 2
2ACCESS
ACCESS
ACCESS LEVEL 1
ACCESS
QUIT
QUIT
ACCESS LEVEL 0
ACCESS
DATE
EVENT
METER
PASSWORD (1 or 2)
QUIT
SET
SHOWSET
STATUS
TIME
VERSION
2ACCESS
DATE
EVENT
METER
QUIT
SHOWSET
STATUS
TIME
VERSION
ACCESS