Gilderfluke&Co Mp3-50 Audio & Show Controllers - Manual (Page 25)

Through’ port on a MIDI device, where no content changes take
place in the data as it passes through the Mp3-50/8 or Mp3-
50/40. The data is simply buffered and retransmitted.
The output levels on these pins is RS-422. It can be used di-
rectly to control other RS-422 devices. For MIDI, you should add a
pair of 220 Ohm resistors in series with the two output wires, but
this is not strictly necessary (there are already resistors in the MIDI
devices which may be receiving this signal).
The MIDI should be wired from the Mp3-50/8 or Mp3-50/40 to
the next MIDI device as follows:
MIDI pin #1 = no connection
MIDI pin #2 = Shield (ground)
MIDI pin #3 = no connection
MIDI pin #4 from - DMX/MIDI Out
MIDI pin #5 from + DMX/MIDI Out
If none of the serial Receive modes of the Mp3-50/8 or Mp3-
50/40 (DMX-512 Input, MIDI Input, Net Serial or IR Trigger) are
being used, then the serial port is turned around and used to
transmit DMX-512. Data for this DMX-512 output stream comes
from either the RS-232 serial port if the Mp3-50/8 or Mp3-50/40 is
being fed RealTime update messages, or the Show Control flash
memory, if shows have been programmed into the Mp3-50/8 or
Mp3-50/40.
DMX-512 transmission is limited to sixteen, eight bit wide
channels. The addresses of these DMX-512 channels are set in
one of two ways:
a) If running from RealTime updates through the RS-232 serial
port, the DMX-512 data will always start with channel ‘0’
(which is channel ‘1’ on most dimmers). Data after the first
channel will be padded with ‘0’ values through the 256th
byte, and then followed by two checksum bytes.
The Show Control Outputs, Audio Level Control, And Re-
peater Control channels typically overlap with some of the
lighting control channels when operated in this mode.
b) If running from a show file which has been AutoDownload-
ed to the Mp3-50/8 or Mp3-50/40’s Flash memory, the ‘First
address’ of the downloaded data will be the first DMX-512
channel to have your programmed data in it. Channels be-
fore and after these sixteen channels will be padded with ‘0’
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