mkcv128 user manual
Contents
1. Output velocity 41 31 21 11 v 0 o cor ce v N OO O O N OO DOD O TAN re e Input velocity info midiboutique com www midiboutique com2. Linear Logarithmic Exponential T off Table 3 MIDI channel ome S type MIDI BIEN channel Bit5 O 5 h On On Fh O On On On o 3 Fh Fh Fh Fh Fh h Off Off o o 9 ss o 5 Fh h E O O O 3 Fh Fh Fh Fh Fh h O O O 3 o 3 o t o h h O 3 O O O O O O O O O ft Fh h O e 3 F O O OJ O O O O O O O Fhe Fhe Fhe hy hye hy et Fay Ft Fh Fh Off Fh h O Fh Fh Fh Faye Fhe hy hyp hy Fy Pht Fh Fh Fh eh Oo FPh FhiS s rh Fh Fh Fh Fh e 3 F Fh O Notes on settings e The Settings DIP switch is being read by microcontroller once at system initialization When changing the settings while the info midiboutique com www midiboutique com mkcvi28s O JDP 2008 MIDI Gadgets Boutique Inc 3 unit is powered the changes won t take effect until the unit is Switched off and then after 5 10 seconds back on or by brief depressing Reset button The red lines in tables above show the factory settings e Bitl of DIP switch is not used in this applicationn and should be always On When left in Off position the unit won t respond to key strokes 4 Technical parameters The most important technical parameters of mkcv128s are listed in following table Table 4 Technical parameters o Parameter verse fons comment O Power supply 8 12V AC DC
3. and lower contact that is proportional to key speed mkcvi28s calculates the Velocity byte per key and recognizes key movement direction The wiring diagram for changeover contacts is shown in Appendix A b The rest of wiring gt Power There is no power supply adapter included with this unit Any power supply unit that is capable to source 100mA at 9 12V AC DC is suitable for powering this unit The unit has standard co axial 0 1 power connector In case that DC power supply is used the polarity does not matter as there is on board diode bridge that takes carry about polarity Under normal conditions the unit will draw less than 50 mA of current gt MIDI The unit has standard MIDI output is capable to drive any standard MIDI input The unit has standard DIN5 connector that is compatible with standard MIDI cables cables not included gt I O Besides bussbar pins there are three more pins on I O header that allow additional control They can be used fer wiring Sustain switch pedal and Reset button see wiring diagrams In normal conditions user does not need Reset button The Reset pin can be left unconnected The unit will reset at each powering which is enough for normal use When the unit is integrated in more sophisticated systems the Reset pin can be used for Master Reset purposes The unit will be held in Reset non responsive state until Reset pin is held down Stadard TTL level s
4. V voltage External adaptor or battery Typical current 50 mA not included drawn Max number of Type of contacts is scanned key 128 selectable contacts changeover parallel tL 4o m m oteOn NoteOff MIDI messages with Velocity stain CC 64 1 16 user me o8 eem o0 info midiboutique com www midiboutique com mkcvi128s JDP 2008 MIDI Gadgets Boutique Inc Appendix A mkcv128s wiring diagram for CHANGEOVER contacts Upper Bussbar Lower Bussbar KEY IS FLYING Title KEY contact wiring for CHANGEOVER contacts Key Input Key Input Key Input Power Key inputs 97 128 made in BG 8 E E Upper bussbar Tower bussbar 10 Key inputs 33 64 Reset button optional Settings Sustain switch Key inputs 1 32 MIDI Out info midiboutique com www midiboutique com Wiring diagram for CHANGEOVER contacts mkcv128s Gapid mkcv128s wiring changeover SchD rawn By H ig E z y a e 8 amp 8 E ia 8 File mkcv128s JDP 2008 MIDI Gadgets Boutique Inc Appendix B Velocity response curves supported by mkcv128 Velocity response curves 121 111 101 91 81 LIN EXP LOG 71 61 51 S TYPE
5. ignals can be applied on this pin Sustain switch is mostly used for piano keyboards When not used it can be left unconnected info midiboutique com www midiboutique com mkcv128s JDP 2008 MIDI Gadgets Boutique Inc 3 Setting and using mkcv128s Once mkcvi128s is installed in keyboard it is turned into standard Velocity sensitive MIDI keyboard mkcvi28s performs continuous scanning of all key contacts for detecting their status changes Scanning process is repeated once in each 3 6 milliseconds or once in each 1 8 milliseconds depending on user settings This unit can only scan key cinatcts of change over type Four Velocity response curves are supported by unit giving the player freedom to set the key response mapping for most appropriate key feeling The velocity response curves can be set using proper bits on Settings DIP Switch The MIDI channel is user selectable via 4 bits on Settings DIP Switch Any MIDI channel 1 16 can be set this way Tables below show the meaning of each bit in Settings DIP switch Swl Note that bit numbers in these tables reflect the numbers printed on the switch itself most significant bit being 1 least significant bit being 8 Table 1 Scanning speed resolution Scanning Bit2 period mS Velocity resolution 7 bit spread over 7 bit range Off 6 bit Table 2 Velocity Respons ome ma o FE O curv Velocity resolution
6. mkcv128s Velocity sensitive MIDI keyboard encoder user s guide 1 Purpose mkcvi28s is a small electronic unit designed to be installed in mechanical keyboard instruments like pianos organs etc thus making them capable to transmit MIDI messages for controlling external MIDI gear expanders synthesizers etc mkcvi128s generates NoteOn and NoteOff MIDI messages that carry real Velocity information depending on the speed of key depressing Also transmitted is Sustain MIDI controller CC 64 on depressing the Sustain button or footswitch For sensing Velocity there should changeover contact contact actuated by each key See wiring diagram Appendix A for details 2 Wiring mkcv128 a Contacts There are 8 labeled cable headers each 2x8 pins for connecting the key contacts Two pin of I O cable header from the opposite side of PCB are dedicated to bussbars In changeover contacts a contact spring actuated by key itself is moving between two terminals When spring is touching upper terminal this indicated Key Up position when spring is touchig lower terminal this indicates Key Down position when spring is not touching any of terminals this indicates Key Flying status This kind of contacts can be found in older systems Typically upper terminal is being actuated at about 20 of key traveling while the lower terminal is being actuated at about 80 of key traveling Measuring the time between actuating upper
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