Doepfer CTM64 Contact to Midi Interface (main board) Uživatelský manuál Strana 4

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page 4 CTM64 Version 4 - User's Guide
Introduction
CTM64 is an
universal MIDI Out kit
. Up to
64 free contacts
can be connected to generate MIDI note
on/off or program change messages. CTM is suitable to
retrofit
keyboards, switch panels, button
arrangements
or any other contacts so that they are able to transmit MIDI data. Up to 4
potentiometers
can be connected to generate
common MIDI controllers, pitch bend
and
after
touch
. Additionally a 1/4 jack socket is available for connecting a
sustain pedal
.
Two different modes
are selected with the first of 8 jumpers:
note on/off
or
program change
. In the
note mode closing of a contact generates the corresponding MIDI note on message, opening generates
note off - both without velocity (velocity is fixed to 100). In the program change mode closing of a
contact leads to the corresponding MIDI program change message.
The
note offset
(i.e. the MIDI note number assigned to the first contact) can be set to 0 or 36 with the
second jumper. With two more jumpers one can transpose up/down one octave, i.e. +12/-12 semitones.
Instead of these jumpers a 3-position switch (1-0-1) working as an
octave switch
can be soldered to
the corresponding pins of the jumper pin header. In this way the note offsets 0, 12, 24, 36 and 48 are
available. If another note offset (e.g. 41) is required the contacts are displaced correspondingly and the
unused contact terminals are left free.
In the
program change mode
the offset can be set to 1 or 64, i.e. setting the program number range to
1-64 or 65-128 (0-63 or 64-127 in MIDI code). With two daisy-chained CTM64 the whole program
number range 1...128 is covered.
The
4 potentiometer
plugs are used to connect up to 4 potentiometers (e.g. rotary, slider, wheels or
others) generating the MIDI messages
pitch-bend, modulation (controller #1), volume (controller
#7) and monophonic after touch.
The 1/4“ jack socket can be used to insert a sustain pedal (contact type ”closed at rest” is required)
generating the MIDI
sustain
message (controller #64).
The
MIDI channel
for all messages transmitted by the CTM64 is set with the last 4 jumpers.
The
64 contacts
are connected to four
double row pin headers
with 16 pins each. 16 pin socket-
connectors (female) with flat cable can be connected to these pin headers (not included with the
CTM64). Additionally there is one common pin for all contacts. Pay attention that only free contacts can
be used. This means that the contacts are not allowed to be connected with another electronics or
connected with a fixed voltage (e.g. GND).
For the potentiometer four male pcb connectors with 3 pins (GND, slider, +5V) are available. Suitable
female connectors with assembled cables can be connected to these pin headers (not included with the
CTM64).
CTM64 is equipped with
MIDI In
and
MIDI Out
. The incoming MIDI messages are
merged
to the data
generated by the CTM64. In this way
several CTM64 can be linked
together (e.g. 3 CTM64 required
for 2 keyboards with 61 keys and one basepedal with 32 keys, or switch boards with more than 64
switches).
CTM64 is available only as an
assembled and tested pc board
. The pc board measures are about 90
x 105 mm. Four mounting holes with 3 mm diameter are available for mounting the pc board to a
suitable base e.g. with distance sleeves or spacers and screws.
The configuration of CTM64 (i.e. MIDI channel, mode, note offset and so on) is made by the customer
with 8 jumpers - as described above.
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