UMC32+ DIY USB-MIDI User Manual
Firmware v3.1.0, Hardware v1.1, Datasheet: 03/20/2011 1:37 PM / © 2008-20011 Hale Microsystems LLC, http://www.halemicro.com
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Message Type
Note On (0x90)
– This is the recommended message type for input or output controls that are Boolean or ON/OFF. Such controls are
switches, or other sensors that output a logic level high or low. When this mode is selected for a channel there are certain conditions
that will cause a note off (0x80) message to be generated. Instead of generating a Note On with a velocity of zero the UMC will
generate a true note off message. This applies to IN Digital w/Pullup (active low), IN Digital (Active Low), IN Digital (Active High)
hardware Input types. For the hardware Output type(s), both note on velocity of 0 as well as Note off velocity zero are interpreted
correctly by the UMC.
Poly Pressure (0xA0) & Controller (0xB0):
These message types are recommended for I/O‟s that are configured as Analog inputs.
Msg Num (Message Number)
Depending on the Message type the message number may be interpreted differently. The allowable range for this parameter is 0 to
127 (0x00 to 0x7F in hexadecimal). With regards to note on and poly pressure message types these values are indicative of note
numbers or keys on a piano keyboard. For instance C-1 is 0, C#4 is 61 and
G9 is 127.
Default:
This will initialize all controls to the following: IN Digital w/pull-up (active low), MIDI Channel X (where X = the device #), Note On,
message number 36 thru 67.
All Off:
This will initialize all controls to the following: I/O Disabled, MIDI Channel X (Where X = the device #), Note On, message number 36
thru 67.
General Precautions
The UMC is designed to protect against short circuits, over current conditions, transient voltages and electrostatic discharge. However,
we ask that you observe some simple guidelines when working with the UMC. Failure to do so may cause damage to your equipment
and/or void your product warranty.
o
Treat the UMC32 as you would any modern computer RAM and observe best practices for Electrostatic Discharge
see:
http://www.phys.cwru.edu/courses/p203/resources/ESDprocedure.pdf
or
http://www.esda.org/esd_fundamentals.html
o
Do not place a jumper or otherwise short circuit the ExtLED pins or the Ext 5V Power pins.
o
Do not solder any wires or attempt to make any modifications to the UMC directly.
o
Do not connect the “+V” (+5 Volts DC) terminal to G (Ground). When this occurs, it is commonly referred to as a
“short circuit”.
o
Always unplug the USB cable from the device before modifying connections on the UMC.
o
As with all electronic devices, observe proper ESD handling practices. Always handle the printed circuit board (PCB)
by the edges, never touch the top or bottom. Failure to make sure you are ground
o
Never allow the UMC to touch a wet or conductive surface.
o
Do not use any external voltage source to power devices that are connected to the UMC.
o
The maximum recommended current per channel is 8mA..
o
You may use the +5V and Ground pins off each bank to power other devices such as LED‟s however the maximum
recommended is 80mA.
o
As an additional precaution, we
strongly
recommend using a powered USB hub when experimenting with the device.
Once you have finalized your project, and are sure you do not have any short circuits then you may connect the UMC
directly to your computer‟s USB input. This is especially important when interfacing with a laptop, as damage to your
laptop could be substantial.
o
This product is offered to the end user in a non-enclosed OEM form, it is the responsibility of the end user of this
product to ensure that they comply with local regulations pertaining to unintentional radio frequency emissions. In the
United States, this pertains to FCC rules and regulations, Part 15, Section B.
