09/03/18
Page 13 of 43
AWL200 User Manual
5
Operating states
The AWL200 has several operating states concerning display status and communication
possibilities over USB. The following chart shows the different states.
Reset
Stickreader Mode (CDC)
Virtual Comport
Display ON
Communication enabled
SD-Card Mode (MSC)
Mass Storage
Display OFF
No Communication
Switch-Off-Time
>2 sec.
Suspend Mode
Display OFF
Communication enabled
Sleep Mode
Display OFF
No Communication
USB connected
Key pressed
USB plug-in
USB not
connected
USB connected
USB not
connected
When the reader is switched on and it is connected via USB, it works in CDC mode. That means
a virtual comport is created on the computer and it is possible to send commands to the device
via a serial port connection. In this state the mass storage mode is not activated, it is not possible
to copy files to or from the AWL200.
After the configurable switch-off-time (default = 60 seconds) has elapsed, the reader enters
suspend mode when a USB cable is connected. The display is switched off but communication is
still possible. In this state the blue LED on the right above the display is flashing in cycles of one
second. The device will not enter sleep mode as long as USB is connected. The red LED flashes
in intervals of one second, indicating that the battery is being charged.
If the AWL200 is connected to USB while it is switched off, the MSD mode is activated. Then the
reader is attached to the computer as a mass storage device and file transfer is possible. Once
the key is pressed, the device will switch on and use CDC mode right away. When pressing
for at least two seconds while USB is connected, the AWL200 will enter MSD as well.
