Extron Electronics MLC 60 Series User Guide - Manual (Page 63)

On the MLC 64, the LEDs are numbered as follows:
LED Number LED Location
1 Transmit red
2 Transmit green
3, 4, 5, 6 Four LEDs behind “Display” text
7 Button row 1, first LED (button 1)
8 Button row 1, second LED (button 2)
9, 10, 11 Button row 2, LEDs 1 through 3
12, 13, 14 Button row 3, LEDs 1 through 3
15, 16, 17 Button row 4, LEDs 1 through 3
18, 19, 20 Button row 5, LEDs 1 through 3
21 through 32 Not used (The status is always 0 .)
Each digit in the X21@ number can be 0 through 4 , representing the following
possible LED statuses:
0 = off
1 = dim
2 = on (bright)
3 = slow blink
4 = fast blink
NOTE: Unless otherwise indicated, commands are not case-sensitive.
MLC 60 Series MediaLink Controllers • SIS Control 57