Lexicon MPX 1 - MIDI IMPLEMENTATION DETAILS Midi Implementation Manual page 43

MPX 1 MIDI Implementation Details
6 Column 3
7 7 Segment
Display 2
(middle)
8 Column 4
9 7 Segment
Display 3
(right)
10 Column 5
1 represents an LED being turned ON. 0 represents the LED turned OFF for the headrooms and 7 segment
displays. For the "Columns" the states are reversed: 0=ON, 1=OFF. When sending the data to the system,
"unused" bits can be treated as "don't care" (they are stripped off).
Note that the first 3 bits of the "Columns" contain scan information used by the system to drive a hardware
multiplexer which provides scanning for both the LEDs and the keyboard. When sending this dump to the
system, the states of these bits MUST be as shown in the table above ( "Scan bit 0 (x)" ).
Remember, when sending LED information, that the system software is often updating certain LED states
in real-time (blinking LEDs, etc.). When this happens the values you send will be overwritten by the
system's values.
If you are using this feature, it is recommended that you first request the current state of the LEDs and
save it locally so that you can restore the LEDs to their proper state after you are done.
40
bit 0 = Scan bit 0 (0)
bit 1 = Scan bit 1 (1)
bit 2 = Scan bit 2 (0)
bit 3 = Mix LED
bit 4 = Patch LED
bit 5 = Bypass LED
bit 6 = System LED
bit 7 = unused
bit 0 = segment a
bit 1 = segment b
bit 2 = segment c
bit 3 = segment d
bit 4 = segment e
bit 5 = segment f
bit 6 = segment g
bit 7 = decimal point (Clock)
bit 0 = Scan bit 0 (1)
bit 1 = Scan bit 1 (1)
bit 2 = Scan bit 2 (0)
bit 3 = Tempo LED
bit 4 = 'A' LED
bit 5 = Value LED
bit 6 = Store LED
bit 7 = unused
bit 0 = segment a
bit 1 = segment b
bit 2 = segment c
bit 3 = segment d
bit 4 = segment e
bit 5 = segment f
bit 6 = segment g
bit 7 = decimal point (MIDI)
bit 0 = Scan bit 0 (0)
bit 1 = Scan bit 1 (0)
bit 2 = Scan bit 2 (1)
bit 3 = MIDI LED
bit 4 = 'B' LED
bit 5 = Options LED
bit 6 = unused
bit 7 = unused
Lexicon
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0