User's Manual

Elatec GmbH
Page 6 of 44
3.1 USB-Device
A TWN3 USB reader is capable of supporting several modes of operation.
3.1.1 Keyboard Emulation (USB HID Device)
This is the default mode for USB devices. No drivers are required for running the device in a typical
environment like Windows XP or Linux. Any output from the TWN3 transponder reader to the host is
sent like keyboard input from a user. Therefore, any characters are displayed at the current position of
the cursor on the screen of the computer.
Please be aware, that the communication between TWN3 device and host computer is unidirectional.
This means, there is no possibility to send data from the host to the TWN3 device. In situations where
this is required, we recommend the emulation of a serial port.
3.1.2 Emulating a Virtual Serial Port
Optionally, a USB device can be configured to emulate a virtual serial port. This mode of operation is to
be preferred, if a direct communication between application and TWN3 transponder reader is required.
This mode also enables a bidirectional communication between .
The communication protocol is identical to the version of TWN3 reader with a physical V24 interface.
3.2 V24-Device
3.2.1 Serial Communication Parameters
Parameter Value
Baudrate 9600 Baud
Databits 8
Parity None
(1)
Stopbits 1
Handshake None
Connector DSUB25 or DSUB9 or PS/2
(1)
TWN3 Multi125 in transparent mode is using even parity, which is the native setup for the T4
transponder reader family.