35
Caution
Input voltages above 50Vpk at Vin will irrevocably damage the unit.
Example 3 — Normally Closed Contact (48V input)
V
IN
DX.+
DX.-
Normally closed
contact
48V
3K
External
resistor
Internal resistor
already fitted
Figure 14
Normally closed contact
In
Figure 14
on page 35 , when the switch is pushed, the binary
input changes from high to low. When the switch is released, the
binary input changes from low to high.
Binary Output
The switching of the video card’s Rx.1 and Rx.2 binary ports is
controlled via your software applications. These ports are
electronically switched and are either open-circuit or closed. Once
closed, the effective resistance between Rx.1 and Rx.2 is not
greater than 2
W
. A typical example is shown in
Figure 15
on
page 36.
