Christie ACT - Page 19

Section 2: Installation & Setup
Christie ACT User Manual 2-5
020-100129-05 Rev. 1 (02-2010)
R= 600 ohms
User
Christie ACT
Fairchild MOC256M
Optically Coupled Isolator
No Connection
Softwar
e
reads
OFF
Figure 2-5 Inputs OFF State
R= 300 ohms
GND on 5V Power Output Terminal
5V
NOTE: Not to be
connected in this
mode
Pull-up
+ ground
R= 300 ohms
5V
Optically Coupled Isolator
Pull-up
+ ground
Software
reads
ON
R= 600 ohms
User
Christie ACT
Optically Coupled Isolator
External
voltage
Software
reads
ON
Figure 2-6 Inputs ON State
The Ground (GND)
is shared
with Input Pullups
Figure 2-7 Inputs With Internal Pull-ups (Active)