WI-GTWY-9-xxx Wireless Gateway V1.18
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3.4
Input / Output
The WI-GTWY-9-xxx has eight on-board discrete/digital I/O. These act as both discrete inputs
and discrete outputs.
3.4.1
Digital Inputs / Outputs
All eight of the WI-GTWY-9-xxx DIO terminals may be used as discrete inputs. These inputs are
suitable for voltage free contacts (such as mechanical switches) or NPN transistor devices (such
as electronic proximity switches). PNP transistor devices are not suitable. Contact wetting
current of approximately 5mA is provided to maintain reliable operation of driving relays.
Each digital input is connected between the appropriate “DIO” terminal and common “COM”.
Each digital input circuit includes a LED indicator which is lit when the digital input is active,
that is, when the input circuit is closed. Provided the resistance of the switching device is less
than 200 ohms, the device will be able to activate the digital input.
All eight of the WI-GTWY-9-xxx DIO terminals may also be used as discrete outputs. The
digital outputs are transistor switched DC signals, FET output to common rated at 30VDC 500
mA.
Digital outputs may be configured to individually turn off if no command message is received to
that output for a certain period. This feature provides an intelligent watch dog for each output, so
that a communications failure at a transmitting site causes the output to revert to a known state.
See Chapter 4
Configuration
for further details.
The output circuit is connected to the appropriate “DIO” terminal. Each digital output circuit
includes a LED indicator which is lit when the digital output is active.
+
_
DIO
DIO
GND
WI-GTWY
9-xxx
Voltage-free
contact input
Transistor
input
V
+
V
-
_
+
DC
Load
Max 30VDC
0.5A
DIO
DIO
GND
WI-GTWY
9-xxx
