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TM
44.
GPI means General Purpose Interface (sometimes known as GPO - General Purpose Output). It refers to 8 contact
closure lines at the rear of the machine which can be used to trigger events external to the machine.
GPI "Type"
GPIs switch at specific timecodes or upon certain events. Each GPI is given a "type", which determines what type of
event triggers it. Use the GPI Menu to set the type and other parameters.
Choosing a GPI
The first 8 Track Keys represent the 8 GPIs when the GPI Menu is active. Only one can be selected at a time.
The GPI Menu
The first Soft Key is always labelled Type. The other Soft Keys depend on what has been selected as the Type. This
information is presented in tabular form on the facing page.
Electrical Properties
GPI outputs 1 to 8 are pins 2 to 9 of the 9-pin connector labelled GPO at the rear of the machine. Pin 1 is a common
ground. When ON, each GPI output is shorted to ground. When OFF it is open, and can be connected via a resistor
to the desired trigger voltage.
GPI Circuit
Note: when a GPI is set to the BEEPS type, MFX
can also output audio beeps from one of its chan-
nels. This is controlled from a configuration file
called mdr_cfg, which is discussed in a later section
of this manual called Configuration Files.
132
Page
The GPI Menu
Current (up
to 40 mA)
Pin 1 - always connect
to ground of external
device
Supply voltage
(up to 30V)
Resistor
Customer
Device e.g.
Relay
User Manual
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