USB2SER Data Sheet, Rev. 0

Drivers and GUI

Freescale Semiconductor

10

Where:

BitsPerByte — 11 for 2 stop bits or any parity option or 10 for 1 stop bit without parity

96 is the Serial buffer size in Bytes

In case the USB host does not request for data before the time out expires and there is no flow control option selected, previously

received data will be overwritten with the new received information.

2.6

Operation with commercial terminals for serial communication

Standard terminals for UART communication may have some limitations in the type of data that may be sent/received or some

protocol supports.

Known limitations are:

•

Binary option must be supported to communicate data that is not standard text

•

Communication Protocols (that is, Z modem with Crash recovery, X modem, Y modem, Kermit, and so on) may

include a protocol timeout that may not work in baud rates below 2400 bps

When using a standard terminal (HyperTerminal or TeraTerm for example) you must, make sure that the proper configuration

is selected to send the desired type of information.

3

Drivers and GUI

The USB2SER can work with the standard Windows driver or with a custom driver for expanded functionality. The Microsoft

Windows driver will enable a USB to COM port communication but without Hardware or Software Flow control features from

the Host PC to the device. To use this approach, it is possible to copy contents from Appendix C and save it as a file with

extension .inf. When the driver is requested the first time after connecting the device it is possible to select this INF file.

Freescale custom drivers for communication allow using any standard terminal or customer software to enable or disable

Hardware or Software flow control. The driver also comes with a set of functions to configure Maximum Current consumption

through the USB port, Product Strings, Vendor ID and Product ID. Password protects these settings. If any of the product strings

or VID/PID is changed, it is necessary to send the product for USB certification if the customer wants to use the USB logo.

3.1

Graphical user interface for product configuration

The GUI provided with the USB2SER is intended to allow the modification of the Bus Power configuration, Vendor ID, Product

ID and any of the manufacturer strings. This allows the customization of any product using this product. It is also possible to

password protect the device configuration to avoid future modifications after a product release.

96

*

_

BaudRate

e

BitsPerByt

Timeout

Overflow

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