ADLINK PCI-9524 - Manual (Page 61)

Signal Connections 45
ADLINK Technology Inc. PCI-9524
Copyright 2008 User’s Manual
3.3.5 Interfacing Isolated DI with External Devices
Connecting to a low-side push button
Alternatively, the push button can be connected at the high-side,
i.e. between the ISOVDD and IDn+ pins. Also, the IDIn+ and IDIn-
can be interchanged, since the opto-coupler accepts bipolar input
signals.
Figure 3-17: Connecting to a low-side push button
IDIn+
IDIn-
2.7KO
ISOGND
PCI-9524
5 VDC
ISO5VDD
P
u
sh
Butto
n