JLCooper MCS5 - Manual (Page 30)

Notification Message
F0 15 7F 40 04 <text> F7
Value Definition
<text>
Exactly 46 characters of text, which will be
displayed as 2 lines of 23 characters.
Label Message
F0 15 7F 40 00 bb <text> F7
Value Definition
bb Button number
00 - 07 for App buttons A-1 - A-8
08 - 0F for App Buttons B-1 - B-8
<text> Exactly 5 characters of text, which will be the button
label.
NOTE: The button numbering in this message is different than the numbering used in the Button LED
message.
MCS5 User Manual
30