Parker Vansco - Page 32

22 VMM2404
Inputs
3.2.1.1. Programmable Digital Input Installation Connections
A digital input is typically connected to a switch that is either open or closed.
 When the switch is open, the pull-up or pull-down resistor will ensure that no
signal exists on the input pin, which will be interpreted by the VMM2404 as
inactive.
 When the switch is closed, the input is connected to either battery voltage or
ground, which will be interpreted by the VMM2404 as active.
Active-high input
The active-high output must be connected to battery power to ensure that there is
a battery connection when the state of the input changes.
The following shows a typical active-high digital input connection:
Internal to product
Active High
Digital Input
Battery
Application Switch
Figure 8: Active high digital input