3
CONTROLS
REMOTE CONTROL / POTENTIOMETERS
remote control
pin numbers
pots #1~23
+5 Volts
pin #1~23
pin #24
ground
pin #25
remote control
13
1
25
14
Rotary or slide potentiometers may be used with the RCU. Potentiometers should be between 5k ohms and 50k ohms in value, with a
linear taper. Potentiometers are wired to the RCU Remote Control port with the ‘high’ side of the potentiometer to +5 Volts (pin 24), the
‘low’ side of the potentiometer to ground (pin 25), & the ‘wiper’ of the potentiometer to the desired control terminal (pins 1~23).
13
1
25
14
potentiometer wiring
5k
Ω∼
50k
Ω
linear taper
gnd pot +5V
low (ccw)
wiper
pot #1
high (cw)
ground
+5 Volts
cw
ccw
w
LOGIC INPUTS / CONTACT-CLOSURES
logic inputs
pin numbers
logic #1~24
ground
pin #1~24
pin #25
logic inputs
13
1
25
14
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 a switch, relay, or other contact-closure (such as from a third-party controller) to short the
Logic Input to ground. 2) Use an NPN style ‘open-collector’ logic output from an external 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. Multiple
contact-closures or ‘open-collector’ logic outputs may be wired in parallel to a single Logic Input (see diagram below). Logic Outputs and
contact-closures should be rated for at least 5 Volts / 1mA operation. Low-current / dry-contact closures are recommended for reliability.
Active output driver circuits should not exceed a signal range of 0~5 Volts DC, and should have a minimum pulse width of 100 milli-
seconds. Logic Input impedances are approximately 10k ohms.
13
1
25
14
multiple switches to single Logic Input
