Yamaha MRX7-D, Owner'S Manual

Page: 20 / 36

Various Procedures
MRX7-D Owner’s Manual 20
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 MRX7-D provides 16 input ports and 8 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]-1–15 terminals detect voltage changes from 0V to
5V. The [IN]-16 terminal alone su24V input; volt-
ages in the range of 2.5–24V are detected as High, and volt-
ages below 2.5V are detected as Low.
• The [OUT]-1–8 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-MRX
Editor application.
Euroblock plugs (16-pin) are used for connections to the [GPI]
connector. For details, refer to “Euroblock plug connection” on
page 13.
• 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-MRX Editor,
you can recall presets or edit parameters on an external GPI
device or send signals to it. For details, refer to the “MTX-MRX
Editor User’s Manual.”
Example: Controlling the MRX7-D from a switch box
Example: Controlling the MRX7-D with a 10k ohm
linear taper potentiometer.
Example: Lighting LED indicators on external
devices from the MRX7-D
Example: Lighting an LED by switching an exter-
nal device’s relay from the MRX7-D
NOTE
For the method of adjusting the detection range of the input
voltage at the [GPI] connector (calibration), refer to the “MTX-
MRX Editor User’s Manual.”
IN
+V
+5VDC
A/D
CPU
100k
MRX7-D
IN
+V
+5VDC
GND
A/D CPU
100k
MRX7-D
Variable
resistor
OUT
+V
+5VDC
CPU
10
MRX7-D
Max. 75mA
CAUTION
Do not exceed 75 mA of current from the OUT con-
nector.
OUT
+V
+
–
+5VDC
CPU
10
MRX7-D
Max. 75mA