JLCooper MCS3 MIDI - Manual (Page 9)

Technical Information
MCS
3
Protocol
Wherever possible, this protocol shares the same protocol
used by the MCS
2
MIDI version. Both MMC and sysex
commands are sent for most keys. However, a Host
(computer) may disable one or the other of these messages as
described below.
Message Mode Command
The host can force the MCS
3
to only send one type of MIDI
message by sending:
F0h 15h 10h 02h vv F7h, where:
vv= 01h for MMC Only
vv= 02h for Sysex Only
vv= 03h for both
Com Port Testing/ Identification
A simple inquiry message may be sent to the MCS
3
to test for
communications and identification.
Host sends: F0h 15h 10h 03h F7h
MCS
3
responds: F0h 15h 10h 04h F7h
Record LED
When first powered up, the MCS
3
internally controls the
Record LED. However, if the Host sends any Record LED
message, the unit will switch to external LED control to avoid
any internal/external control conflicts.
A Record LED message is a Sysex string as follows:
F0h 15h 10h 01h vv F7h, where:
vv=00h for LED Off
vv=01h for LED On
vv=02h for LED Blink
9