7.8
SEL-749M Relay Instruction Manual Date Code 20080918
Communications
SEL ASCII Protocol Details
Access Level 0
Once serial port communication is established with the SEL-749M, 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-749M 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-749M to Access Level 1. See Access
Commands (ACCESS and 2ACCESS) on page U.7.10 for more detail.
Access Level 1
When the SEL-749M is in Access Level 1, the relay sends the following
prompt:
=>
See the SEL-749M 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-749M sends the prompt:
=>>
See the SEL-749M Relay Command Summary at the end of this manual for the
commands available from Access Level 2.
Any of the Access Level 1 commands are also available in Access Level 2.
Command Summary
The SEL-749M Relay Command Summary at the end of this manual lists the
serial port commands alphabetically. Much of the information available from
the serial port commands is also available via the front-panel pushbuttons.
Courtesy of NationalSwitchgear.com
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