Studio Technologies 55 1996 - Manual (Page 36)

Issue 3, December 1996 Model 55/56 User Guide
Page 36 Studio Technologies, Inc.
Appendix A
Controlling the Model 55
The Model 55 Central Controller uses
MIDI system-exclusive messages to con-
trol all functions. The Model 56 Control
Console is programmed to generate a
subset of what the Model 55 is capable of
doing. By using standard MIDI messages,
the Model 55 can be used for a wide range
of special applications. Any device that
can be programmed to send system-
exclusive MIDI messages can be used to
control the Model 55.
Note that the 5-pin connector on the Model
55’s back panel is wired somewhat differ-
ently from a standard MIDI input. While
pins 4 and 5 meet the MIDI standard, the
three remaining pins are implemented for
use by the Model 56. Pin 1 supplies
+15Vdc power, pin 2 is shield (ground),
and pin 3 is communications audio input.
If you’re connecting your own controller,
such as a computer’s MIDI interface, you
might be concerned about the DC power
on pin 1. Because the MIDI standard
doesn’t use this pin, it is highly unlikely
that it will be connected inside your con-
troller, so there’s little chance of the DC
causing damage. To be safe, you can use
a MIDI cable with only two or three wires
implemented.
The following pages provide a detailed list
of all Model 55 system-exclusive MIDI
messages.