Yamaha MTX3 MTX3 Owners Manual - Page 18

Various Procedures Connecting via the [GPI] connector 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 terminals. 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 supports +24V 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 maximum 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 12. 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 Guide." • Connection examples using the [GPI IN] connector Example: Controlling the MTX3 from a switch box MTX3 +5VDC +V IN CPU A/D 100k Example: Controlling the MTX3 with a 10k ohm linear taper potentiometer. MTX3 +5VDC CPU A/D 100k +V IN GND Variable resistor • Connection examples using the [GPI OUT] connector Example: Lighting LED indicators on external devices from the MTX3 MTX3 CPU +5VDC 10 +V OUT Max. 75mA 18 MTX3 Owner's Manual CAUTION Do not exceed 75 mA of current from the OUT connector. Example: Lighting an LED by switching an external device's relay from the MTX3 MTX3 CPU +5VDC + +V 10 OUT - Max. 75mA NOTE For the method of adjusting the detection range of the input voltage at the [GPI] connector (calibration), refer to the "MTXMRX Editor User Guide."