• Meter Displays the instantaneous peak signal levels of IDX Channels at
the DX Link Rx (input) jack, pre-IDX Fader and Mute, and the
instantaneous peak signal levels ODX Channels immediately prior
to the DX Link Tx (output) jack, post-ODX Fader and Mute.
• Fader / Gain Adjusts the Gain of IDX/ODX Channel. IDX Faders occurs after
the IDX Mute, but before the Ducker in the IDX signal path. ODX
Faders occur after the ODX Mute, but before the DX Link Tx jack
in the ODX signal path. Gain can be adjusted from [-40] to [+20
dB] in 1 dB steps. Adjust the Gain by dragging the Fader handle.
<
CTRL+CLICK> in the channel Meter to reset the Fader to unity.
• Mute Mutes the IDX/ODX Channel. IDX Mutes are applied between the
DX link Rx jack and the IDX Fader; ODX Mutes are applied
between the Matrix Master Output Fader and the ODX Fader.
Device Window – Logic I/O Tab
Logic Inputs
Principle of Operation
The DX1208 has six Logic Inputs that can each be assigned to control or trigger different
functions within the unit, such as recalling Presets or muting channels. The Logic Inputs are
internally pulled high to +3.3V through a 10 kohm resistor, and can be activated directly by
switch or relay closure, or driven by a TTL/CMOS open-collector Logic Output capable of
sinking at least 0.35 mA of current. Momentary contact switches are preferred, as latching
switches state can easily get ‘out of sync’ with the overall state of the system.
Logic Inputs can be set to either momentary or latching operation, and can trigger on a low-to-
high, or a high-to-low input signal transition. Momentary triggers require only a single
transition, and latching triggers require two transitions. For example, if a normally-open
momentary contact switch is connected to a Logic Input that is configured to momentarily mute
channel 1 on a low transition, then channel 1 will be muted only as long as the switch is
pressed and held; if the input is configured for latching operation, then channel 1 will remain
muted after the switch is pressed and released. Pressing the switch a second time unmutes
channel 1. Additionally, functions can never be triggered simply by changing a Logic Input
setting, even if the change would otherwise cause the trigger to occur. To use the previous
example, if the user changes the Action from [Low] to [High] with the switch open (and hence
the input is logic high from the pull-up resistor), a trigger does not occur, even though the logic
condition matches the input condition.
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