7.15
Date Code 20100129 Instruction Manual SEL-751A Relay
Communications
SEL ASCII Protocol and Commands
Access Levels
Commands can be issued to the SEL-751A via the serial port to view metering
values, change relay settings, etc. The available serial port commands are
listed in the SEL-751A Relay Command Summary at the end of this manual.
These commands can be accessed only from the corresponding access level,
as shown in the SEL-751A Relay Command Summary. The access levels are:
➤ Access Level 0 (the lowest access level)
➤ Access Level 1
➤ Access Level 2 (the highest access level)
Access Level 0
Once serial port communication is established with the SEL-751A, the relay
sends the following prompt:
=
This is referred to as Access Level 0. Only a few commands are available at
Access Level 0. One is the ACC command. See the SEL-751A Relay
Command Summary at the end of this manual. Enter the ACC command at the
Access Level 0 prompt:
=ACC <Enter>
The ACC command takes the SEL-751A to Access Level 1. See Access
Commands (ACCESS and 2ACCESS) on page 7.17 for more detail.
Access Level 1
When the SEL-751A is in Access Level 1, the relay sends the following
prompt:
=>
See the SEL-751A Relay Command Summary at the end of this manual for the
commands available from Access Level 1. The relay can go to Access Level 2
from this level.
The 2AC command places the relay in Access Level 2. See Access Commands
(ACCESS and 2ACCESS) 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 SEL-751A sends the prompt:
=>>
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