Doepfer CTM64 Contact to Midi Interface (main board) Manual do Utilizador descarregar pdf (Página 9)

CTM64 Version 4 - User's Guide Page 9

Contact 1-64 (10) and Common (11)

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 (11) 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).

The cable length has to be limited to a certain value. In accordance to the characteristics of the cable in

use capacitive and inductive effects deform the signal of the pulses that are used to detect a closed or

open contact on the common line (11). In this case closed contacts are no longer recognized or

accidentally only. From our experience cables up to 50 cm do not cause problems. For length between

50 cm and 2 m it depends upon the cable characteristics if the CTM64 will work as it should. Cables

longer than 2 m should be avoided. If long cables are essential relays have to be used. The relays are

located close to the CTM64 and the relay contacts are connected to the CTM64 like normal contacts.

Please pay attention to the warranty notes on page 1. Ignoring these notes causes warranty loss and

the right to return the goods.

Two different modes

are available for the contacts:

note on/off

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 127). In the program change mode closing of a contact

leads to the corresponding MIDI program change message.

Jumpers 1-8 (12)

The CTM64 configuration (MIDI channel, mode, note offset) is defined with 8 jumpers. The jumpers are

put on the double row pin header JP5.

The

jumpers 1-4

(next to the control LED) are used to set the

MIDI channel

Jumper 5

defines the

mode

(

note

programm change

note mode

the

jumper 8

is used to select the

note offset

, i.e. the MIDI note number assigned to the

first contact (= contact no 1). Two different settings are possible: 0 or 36. 0 is the lowest note than can

be generated with MIDI. 36 is the lowest "C" on a standard 5 octave keyboard. Additionally the

jumpers 6

and

can be used to

transpose one octave up or down

(±12 semi tones). Instead of the

jumpers 6 and 7 also a toggle switch with middle position (1-0-1 type) can be used. In this case the

terminals of the switch are connected to the corresponding pins of the double row pin header JP5.

Consequently the note offsets 0, 12, 24, 36 and 48 are available. In case that another note offset is

required the contacts are displaced correspondingly and the unused contact terminals are left free. If for

example a note offset 41 is required the note offset 36 is selected and the terminals 1-5 (corresponding

to the note numbers 36-40) are left open and the first contact is connected to terminal 6 (corresponding

to note number 41).

When the

program change mode

is selected the closing of a contact causes the transmission of a

MIDI program change message on the selected MIDI channel. In this mode

jumper 8

sets the

program

change offset

to 0 or 64. Using two daisy-chained CTM64 with 64 buttons each the complete program

number range 0...127 is available. It is also possible to use a toggle switch instead of jumper 8 to

switch between the program number areas 0-63 and 64-127. The jumpers 6 and 7 have no function in

the program change mode.

Pay attention that there are 2 ways of counting of the program numbers: "1-128" or "0-127". If the

counting mode "1-128" is used one has to subtract "1" to obtain the corresponding program change

number in the counting mode "0-127". It depends upon the manufacturer of a MIDI device (synthesizer,

expander, sampler ...) if the counting "1-128" or "0-127" is used.

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Doepfer CTM64 Contact to Midi Interface (main board) Manual do Utilizador Página 9

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