User manual

18 www.cooperbussmann.com/wirelessresources
Cooper Bussmann 245U-E Wireless Ethernet Modem & Device Server User Manual
Rev Version 2.19
Figure 16 End Plate
2.4 Discrete (Digital) Input/Output
The 245U-E has one on-board discrete/digital I/O channel. This channel can act as either a discrete input or
discrete output. It can be monitored, set remotely, or alternatively used to output a communications alarm status.
If used as an input, the I/O channel is 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 5 mA is provided to maintain reliable operation of driving relays.
The digital input is connected between the DIO terminal and common COM. The I/O circuit includes a LED
indicator, which is green 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.
Figure 17 DIO Input
The I/O channel may also be used as a discrete output. The digital outputs are transistor switched DC signals,
FEToutput to common rated at 30 Vdc 500 mA.
NOTE The output circuit is connected to the DIO terminal. The digital output circuit includes a LED
indicator, which is red when the digital output is active.
Figure 18 DIO Output