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Eight Logic Inputs are available on a rear panel 9-pin Sub-D (female) connector. Logic Inputs allow remote control of the DDL12 via
external circuits, such as switches, contact-closures, active driver circuits, and/or 'open-collector' logic outputs. From the factory, Logic
Inputs 1~8 are programmed to recall presets 1~8, respectively. However, each Logic Input may be assigned different 'recall preset
actions'., using the PC Control Software and serial cable provided with the DDL12 (see Setup on pg. 4). Since Logic Inputs are controlled
by switches, contact-closures, etc., each Logic Input may be assigned two functions (one for switch 'closed' and one for switch 'open').
Logic Inputs have the following pin assignments (right-to-left & top-to-bottom): Pins 1~8) Logic Inputs 1~8; Pin 9) Ground.
logic inputs
When nothing is connected to a Logic Input, an internal pull-up resistor keeps it at a 'high' idle state (+5.0 VDC). The Logic Input is
activated when its input goes 'low' (less than +0.8 VDC), and is de-activated when its input goes 'high' (greater than +2.4 VDC). A Logic
Input is controlled in one of three ways: 1) Use an NPN style 'open-collector' logic output from an external device (such as an
®
ADVANTAGE
PMX84 or DRC4+4) to short the Logic Input to ground. 2) Use a switch, relay, or other contact-closure (such as from a
third-party controller) to short the Logic Input to ground. 3) Use an active TTL output driver circuit (such as from a third-party controller) to
actively drive the Logic Input to a 'high' or 'low' state.
LOGIC INPUTS
pin #1 = Logic Input 1
5
4
3
2
1
pin #2 = Logic Input 2
pin #3 = Logic Input 3
9
8
7
6
pin #4 = Logic Input 4
pin #5 = Logic Input 5
pin #6 = Logic Input 6
pin #7 = Logic Input 7
pin #8 = Logic Input 8
pin #9 = ground
6
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