i
.LON SmartServer Hardware Guide
15
Digital Inputs
The SmartServer has two optically isolated, polarity-sensitive digital inputs that you can use to monitor
switch and sensor devices. The digital input connections are implemented on screw terminals 13–16:
Input 2 is connected to terminals 13-14; Input 1 is connected to terminals 15–16. These connections
are polarity-sensitive: terminals 14 and 16 are marked positive (+), and terminals 13 and 15 are marked
negative (-). You cannot reverse the polarity of the digital inputs because it will cause improper
operation of the monitoring circuits.
Each of the digital inputs is controlled by a Digital Input application on the SmartServer. See Chapter 9
of the
i.LON SmartServer User’s Guide
for configuring the SmartServer to use the digital inputs to
which it is connected.
The following figure illustrates the location of the digital input screw terminals on the SmartServer.
The following table lists the enclosure markings for the digital input screw terminals on the
SmartServer and their connection type.
Screw Terminal
Enclosure Marking Digital
Input
Connection
13
Input 2-
- Signal from input 2
