Led Behavior In Special Mode - JLCooper Electronics MCS-3800 User's Reference Manual

LED Behavior in Special Mode

The LED can appear to behave either momentary, or latched.
Momentary means the LED is lit only while the button is
pressed. It turns off when you release the button. Latched
means that the LED turns on with the first button press, and
then turns off with the second button press. Alternately, the
LED can flash, or do nothing. It is up to the host system.
The most important thing to understand about the Special
Mode, and the fact that the Special Mode turns Local Control
Off, is that two way communication with the host system is
required for a special mode to operate. In other words, special
mode will not work unless there are (in the case of MIDI I/O)
two MIDI cables connected, or a 422 connection.
If only one way communication is established, and the MCS is
in Special Mode, then it is possible that the unit will appear to
not work. Either the displays will light, but the MCS will not
control the software, or, the MCS will control the software but
none of the LEDs or LCD will light.
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