Yamaha MTX3, Owner'S Manual

Page: 17 / 28

Various Procedures
MTX3 Owner’s Manual 17
GPI (General Purpose Interface) devices can be connected to
the rear-panel [GPI] connectors. GPI allows a variety of control
signals to be exchanged with external controllers or other
devices.
The MTX3 provides 8 input ports and 4 output ports.
• The +5VDC terminals have an output voltage of 5V. The
maximum current draw is 100 mA total for the two termi-
nals. If you are using a switch/variable resistor and an LED/
relay simultaneously, connect one terminal to the switch/
variable resistor and the other terminal to the LED/relay.
• The IN-1–7 terminals detect voltage changes from 0V to
5V. The IN-8 terminal alone su24V input; voltages
in the range of 2.5–24V are detected as High, and voltages
below 2.5V are detected as Low.
• The OUT 1–4 terminals are open collector outputs; they
will change between open or closed (GROUND). The maxi-
mum voltage that can be applied is +12V. The maximum
current draw is 75 mA per port.
The GPI controller parameters are assigned via the MTX Editor
application.
Euroblock plugs (16-pin) are used for connections to the [GPI]
connector. For details, refer to “Euroblock plug connection” on
page 11.
• Connection examples using the [GPI IN] con-
nector
• Connection examples using the [GPI OUT]
connector
Connecting via the [GPI] connector
NOTE
By making input/output channel settings in MTX Editor, you
can recall presets or edit parameters on an external GPI device
or send signals to it. For details, refer to the “MTX Editor User’s
Manual.”
Example: Controlling the MTX3 from a switch box
Example: Controlling the MTX3 with a 10k ohm
linear taper potentiometer.
Example: Lighting LED indicators on external
devices from the MTX3
Example: Lighting an LED by switching an exter-
nal device’s relay from the MTX3
NOTE
For the method of adjusting the detection range of the input
voltage at the [GPI] connector (calibration), refer to the “MTX
Editor User’s Manual.”
IN
+V
+5VDC
A/D
CPU
100k
MTX3
Variable
resistor
IN
+V
+5VDC
GND
A/D CPU
100k
MTX3
OUT
+V
+5VDC
CPU
10
MTX3
Max. 75mA
CAUTION
Do not exceed 75 mA of current from the OUT con-
nector.
OUT
+V
+
–
+5VDC
CPU
10
MTX3
Max. 75mA