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HARDWARE
The interface operates at 31.25
(+/- 1%) Kbaud, asynchronous, with a start bit, 8 data
bits (D0 to D7), and a stop bit. This makes a total of 10 bits
for a period of 320 microseconds per serial byte.
Circuit: 5 mA current
loop type. Logical 0 is current ON. One output shall drive one and only
one input. The receiver shall be opto-isolated and require less than 5
mA to turn on. Sharp PC-900 and HP 6N138 optoisolators have been found
acceptable. Other high-speed optoisolators may be satisfactory. Rise and
fall times should be less than 2 microseconds.
Connectors: DIN 5
pin (180 degree) female panel mount receptacle. An example is the SWITCHCRAFT
57 GB5F. The connectors shall be labelled "MIDI IN" and "MIDI OUT". Note
that pins 1 and 3 are not used, and should be left unconnected in the receiver
and transmitter.
NOTES:
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Optoisolator is Sharp PC-900.
(HP 6N138 or other optoisolator can be used with appropriate changes.)
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Gates "A" are IC or transistor.
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Resistors are 5%
Cables shall have a maximum
length of fifty feet (15 meters), and shall be terminated on each end by
a corresponding 5-pin DIN male plug, such as the SWITCHCRAFT 05GM5M. The
cable shall be shielded twisted pair, with the shield connected to pin
2 at both ends.
A "MIDI THRU" output
may be provided if needed, which provides a direct copy of data coming
in MIDI IN. For very long chain lengths (more than three instruments),
higher-speed optoisolators must be used to avoid additive rise/fall time
errors which affect pulse width duty cycle.
Introduction
& Conventions
Hardware
Message
Types
Data
Types
Channel
Modes
Summary
of Status Bytes
Channel
Voice Messages
System
Common Messages
System
Real Time Messages
System Exclusive
Messages
Controllers
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