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3.3 Isolated Digital Input Connections
3.3.1 Single-ended Channel Connections
USB-4761 has
8
isolated
digital input channels. Each of isolated digital
input
channel accepts 10~30
V
DC
voltage
inputs, and accept bi-direc-
tional
input.
It
means
that you
can apply positive or negative voltage to an
isolated
input
pin (Vin ). The
figure below shows how
to connect
an
external
input
source to one
of
the card's isolated input channels.
Figure 3.2: Isolated Digital Input
Connections
3.4 Relay Connections
After power on,
the initial relay output status
is shown as below:
Figure 3.3:
Relay Output Channel Connections
25 Chapter 3