Schweitzer Engineering Laboratories SEL-2020 - Page 138

4-56 “Job Done” Examples - (Example 7) Date Code 20010518
SEL-2020 Instruction Manual
2. Also for Port 8, use the SET U command to tell the SEL-2020 to watch for the GROUPS
command.
You should see the following screen:
*>>SET U 8<ENTER>
SET U 8<ENTER>SET U 8<ENTER>
SET U 8<ENTER>
User settings for Port 8
Warning: setting CMD_EN=N will disable SEL-2020 commands on this Port
Enable SEL-2020 Commands (Y/N) CMD_EN = Y ? <ENTER>
<ENTER><ENTER>
<ENTER>
General-Purpose User-Defined Input Commands
Number of general purpose commands (0-8) CMD_CNT = 0 ? 1<ENTER>
1<ENTER>1<ENTER>
1<ENTER>
Command String 1
CMD1 = ""
? GROUPS<ENTER>
GROUPS<ENTER>GROUPS<ENTER>
GROUPS<ENTER>
Special-Purpose User-Defined Input Commands
Enable use of special purpose commands (Y/N) STR_EN = N ? <ENTER>
<ENTER><ENTER>
<ENTER>
CMD_EN = Y
CMD_CNT = 1
CMD1 = "GROUPS"
STR_EN = N
Save changes (Y/N) ? Y<ENTER>
Y<ENTER>Y<ENTER>
Y<ENTER>
Port 8 Settings Changed
*>>
Notes:
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Set CMD_CNT=1 to add a new general-purpose user-defined command.
Set CMD1 = GROUPS to establish a command you will send to the SEL-2020 to change
group settings on all attached relays.
3a. Create the command string you will use to perform the group switch. To execute the group
switch you must cause the relay to:
• Go to Access Level 2.
• Issue and confirm the group switch command.
• Return to Access Level 1.
Assuming the Level 2 password is TAIL, and x is the group number, the complete command
string is:
"2AC\nTAIL\nGROUP x\nY\nACC\n"
Since each \n encodes one character, the total length of the string is 23 characters.
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