ReadMe 04-05-01 Note: This application is based on Jan Axelson's usbhidio.exe application which can be downloaded at www.lvr.com. Purpose The USB_to_Serial application allows the user to send and receive one byte to a HID device. This allows the user to determine if they have enumerated successful, and provides a simple means for debugging firmware without having to use the USB to Serial Driver. This program is best demonstrated by running a loopback test with USB to Serial. Use this application to connect to the virtual COM port and use either Hyperterminal or Serial test to open the real COM port. Then you can send and receive bytes (half-duplex) between the two applications. Instructions ****NOTE**** To use this application with USB to Serial, the USB to Serial driver must not be installed. This application communicates with HID devices only. USB to Serial will enumerate as a HID device if the USB to Serial Driver isn't installed. To be sure the driver isn't installed run the HIDCOMINST DOS application (comes with reference design) with a "-u" parameter. Then plug in the USB to Serial device. ************ If desired device is USB to Serial with VID=4B4 and PID=5500 then no initial connection is necessary. The application does a default connect on startup to look for a device containing (VID = 4B4 and PID = 5500). Otherwise enter desired VID and PID in all caps. If you are unsure of attached HID devices select "Show Connected VID/PIDs". Whenever this button is hit, the device must be reconnected by hitting the connect button. Once connected, select the value of the byte to send by either using the drop down menu or clicking on the corresponding LED. You can also deselect an LED by clicking on it. The LED is selected if it is green. Note that selecting a byte value from the drop down will not turn the LEDs on the application green. After the value is chosen hit Send and the desired byte value will be written to the device. To receive data simply hit the receive button. Be aware that the receive box will only display one byte at a time. So if multible bytes are receive you will probably only see the last one. The returned value will be displayed in HEX in a box and also a graphical representation is presented. End of File

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