Doepfer MTC64 Midi to Gate Interface (main board) Manual de usuario descargar pdf (Pagina 4)

Page 4 MTC64 V2 User’s Guide

Introduction

• MTC64 is an

universal MIDI interface

that

converts up to 64 succeeding MIDI note

on/off or program change messages into 64 TTL voltages (0/+5V)

• The outputs of the MTC64 can be used to control different switching functions. With

suitable drivers (e.g. switching transistors)

relays, lamps, motors, electromagnets,

magnetic valves

and so on can be controlled. A transistor driver board with 16 drivers is

planned for end of 2001 (4 of these boards are required if drivers for all 64 outputs are

necessary).

• For small loads (e.g.

LEDs

or high-impedance

reed relays

) the additional drivers may not

be necessary.

• The MTC64 is the

counterpart to CTM64

that generates up to 64 MIDI note on/off or

program change messages with free contacts connected to CTM64 (for details please

refer to the CTM64 product information or CTM64 manual)

MTC64 has

two different modes

•

note on/off

mode (without velocity) or

•

program change

mode

In the first case (

note mode

) incoming MIDI note on/off messages control the 64 outputs

provided that the

MIDI channel

and

note range

correspond to the settings of the

MTC64. A note on message will set the corresponding TTL output to a high level (+5V),

the note off message will reset the output to a low level (0V). With an additional jumper

this behaviour can be set to the other way round (note on = low, note off = high) if

reversed outputs are required.

The

note offset

(i.e. the MIDI note number assigned to the first output) can be set to 0 or

36 with another jumper. With two more jumpers one can transpose up/down one octave,

i.e. +12/-12 semitones. Instead of these jumpers a three-position

octave selection

switch

may be used. Thus the note offsets 0, 12, 24, 36 and 48 are obtainable. If

another note offset is required the unused outputs remain unconnected.

In the second case (

program change mode

) MIDI program change messages are used

to control the 64 outputs. In this mode only one of the 64 outputs is activated. The

number of the activated output is identical to the program change number received at the

MIDI input provided that the

MIDI channel

corresponds to the setting of the MTC64.

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

MTC64 the whole program number range 1-128 is covered. Alternatively a range switch

can be used instead of the range jumper.

The

MIDI channel

for all messages processed by the MTC64 is set with 4 jumpers.

The

outputs

are available as

four double row pin headers with 16 pins each

. 16 pin

socket-connectors with flat cable can be connected to these pin headers (not included with

the MTC64, we offer a suitable cable set that contains all required connectors and cables).

Additionally there are some GND pins available (as solder pins and as additional pin header

with 10 pins) as a GND reference level is required for the devices controlled by the MTC64

outputs.

Pay attention that only voltage-free high impedance inputs ( > 1 kOhm) are allowed to be

controlled by the MTC64 outputs. The inputs must not have any active voltage, i.e. they are

not allowed to have a certain voltage level (e.g. GND). Otherwise the MTC64 and/or the

device controlled by the MTC64 may be destroyed. Ignoring any of these items will cause

warranty loss !

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Doepfer MTC64 Midi to Gate Interface (main board) Manual de usuario Pagina 4

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