5.8
SEL-551 Relay Instruction Manual Date Code 20110408
Serial Port Communications and Commands
Serial Port Access Levels
Serial Port Access Levels
Commands can be issued to the relay via the serial port to view metering
values, change relay settings, etc. The available serial port commands are
listed in Table 5.4. The commands can be accessed only from the
corresponding access level as shown in Table 5.4. The access levels are:
➤ Access Level 0 (the lowest access level)
➤ Access Level 1
➤ Access Level 2 (the highest access level)
➤ Access Level C (restricted access level, should be used under
direction of SEL only)
Access Level 0
Once serial port communications are established with the relay, the following
prompt appears:
=
This is referred to as Access Level 0. The only commands that can be executed
at Access Level 0 are the ACC and QUI commands (see Table 5.4). Enter the
ACC command at the access level prompt:
=ACC <Enter>
The ACC command allows the relay to go to Access Level 1 [see ACC, 2AC,
and CAL Commands (Access) on page 5.11 for more detail].
Access Level 1
When the relay is in Access Level 1, the following prompt appears:
=>
Commands 2AC through TRI in Table 5.4 can be executed from Access
Level 1. For example, enter the MET command at the Access Level 1
computer screen prompt to view metering data:
=>MET <Enter>
The 2AC command allows the relay to go to Access Level 2 [see ACC, 2AC,
and CAL Commands (Access) for more detail]. Enter the 2AC command at the
Access Level 1 prompt:
=>2AC <Enter>
Access Level 2
When the relay is in Access Level 2, the following prompt appears:
=>>
To Next Page
Loading...
