TASCAM DM-24 Installation and Use v 2.0 Manual Addendum - Page 17

DM-24 version 2.0-Release notes-GPI functionality To use the internal MTC generator, the SYNC SOURCE must be set to INT (internal), and the appropriate frame rate and internal generator start time selected in the OPTION SYNC/TC screen. See pages 23 and 24 of the main manual for full details. GPI functionality This release of the software added GPI functionality to the DM-24. Use GPI for tasks where items (video switchers, etc.) must be switched on or off, etc. as simple switching is available using this facility. The GPI outputs can be switched either using keys and faders on the DM-24, or they can be time events, triggered when the timecode source reaches a preset point. The DM-24 is fitted with a 9-pin D-sub connector on the rear panel, marked GPI. Pin 5 of this connector is used as a frame ground, and the remaining eight pins are then used as GPI ports. Pin GPI port Pin GPI port 1 1 2 2 3 3 4 4 5 FG 6 5 Pin GPI port Pin GPI port 7 6 8 7 9 8 The ports provide switching (either a high-to-low or a low-to-high transition, or a momentary high or momentary low pulse). The low level is 0V, and the high voltage level is +5 V. The typical load presented to these switches is 12mA, and the maximum load permissible is 25mA. Switching is virtually instantaneous (3ns) and the width of the momentary pulses is 150ms. Using GPI Enter the GPI screen from the UTILITY screen, and use soft key 3 to move to the GPI tab. Set up the ITEMs of the eight available ports from the following list: • TIME EVENT-this is a special item which disables this port for any manual events. If this is set, the TYPE is set to --- and cannot be changed here (it is set in the time event list). Also note that the enable/ disable button is also set to a the OFF setting, which cannot be changed, showing that the port is not available from the manual events. • MUTE (pressing the selected hardware MUTE key (any one of the 32 channel faders, or any of the aux or buss faders) will trigger the event) TASCAM DM-24 2.0 release notes 17