XT-1/XT Mini Manual
13-111 05, 2015-08-14
Page 17 of 32
Inputs
The reader has 3 opto-coupled inputs.
Connections
INPUTS:IN1+
Input 1 positive terminal
INPUTS:IN1-
Input 1 negative terminal
INPUTS:IN2+
Input 2 positive terminal
INPUTS:IN2-
Input 2 negative terminal
INPUTS:IN3+
Input 3 positive terminal
INPUTS:IN3-
Input 3 negative terminal
High Voltage (active)
Min 3.0 V / Max 30 V
Low Voltage (inactive)
Min 0.0 V / Max 0.2 V
Input impedance
1 k
Ω
Max cable length
100 m
Wire size
0.5 mm
2
(AWG 20)
Table 11 Input connection overview
The inputs are activated by a current flow and the input impedance is 1 k
Ω
. A schematic view of an input is
shown in Figure 16.
Figure 16 Input schematic
The first two inputs can be used to control the green and red LED from an external access control system
to indicate if access has been granted or denied. The third input can be used as a read enable/disable
input. This input can be connected to an external presence detector such as an inductive loop to make sure
that the reader only reads tags when a vehicle is present.
All inputs have a debounce filter that is enabled by default. When the debounce filter is enabled, short
pulses on the inputs are ignored. Pulses must be at least 20 ms to guarantee that they are detected. The
polarity of the inputs can be inverted to cope with signals that are active high or active low.
The read enable/disable input can be configured to work in different modes. "Read time" is used to specify
how long time reading should be enabled after it has been activated by the input. If read time is zero,
reading is enabled as long as the input is active. The "Abort after read" setting can be used to abort reading
after a single tag has been read (read time must be non-zero for this setting to have any effect). The
"Indicator" setting is used to specify the colour of the LED when reading is enabled.
All input settings are available under Settings…/Interfaces…/Inputs in the web interface.
Light and Sound
The reader has a bright red/green/yellow LED indicator that is clearly visible on the front side of the reader.
The LED indicator can show when a tag has been read and if access has been granted or denied.
A built-in buzzer can give an audible indication when a tag has been read or settings have been changed.
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