Schweitzer Engineering Laboratories SEL-351A, Manual

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10.10
SEL-351A Relay Instruction Manual
Date Code 20080213
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 10.6 . The commands can be accessed only from the
corresponding access level as shown in Table 10.6 . The access levels are:
➤
Access Level 0 (the lowest access level)
➤
Access Level 1
➤
Access Level B
➤
Access Level 2 (the highest access level)
Access Level 0
Once serial port communications are established with the relay, the relay
sends the following prompt:
=
This is referred to as Access Level 0. The only command that is available at
Access Level 0 is the
ACC command (see Table 10.6 ). Enter the ACC
command at the Access Level 0 prompt:
= ACC <Enter>
The ACC command takes the relay to Access Level 1 [see ACC, BAC, and
2AC Commands (Go to Access Level 1, B, or 2) on page 10.14 for more
detail].
Access Level 1
When the relay is in Access Level 1, the relay sends the following prompt:
=>
Commands BAC – TRI in Table 10.6 are available from Access Level 1. For
example, enter the MET command at the Access Level 1 prompt to view
metering data:
=> MET <Enter>
The 2AC command allows the relay to go to Access Level 2 [see ACC, BAC,
and 2AC Commands (Go to Access Level 1, B, or 2) for more detail]. Enter the
2AC command at the Access Level 1 prompt:
=> 2AC <Enter>
The BAC command allows the relay to go to Access Level B [see ACC, BAC,
and 2AC Commands (Go to Access Level 1, B, or 2) for more detail]. Enter the
BAC command at the Access Level 1 prompt:
=> BAC <Enter>
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