19
XYR400E Ethernet Modem
Version 1
5/1/08
DIO
GND
XYR
400E
Voltage-free
contact input
V
+
V
-
2.5
Discrete (Digital) Input/Output
The XYR 400E 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, or 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 5mA 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 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.
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 30VDC 500 mA.
The output circuit is connected to the "DIO" terminal. The digital output circuit includes a LED
indicator which is lit when the digital output is active.
Chapter Three
OPERATION
3.1
Start-up
“Access Point” Start-up
An Access Point (AP) unit starts and immediately begins transmitting periodic messages, called
beacons, on the configured channel. Beacons include capability information that a Client may
examine in order to identify if the Access Point is suitable for link establishment. Clients will only
_
+
DC
Load
Max 30VDC
0.5A
DIO
GND
XYR
400E
