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Troubleshooting
2-8 CAN USB-232 User Manual
Once connected to a USB port, the CANUSB will appear as a COM port in the Device Manager. The
CANUSB will always use the lowest available COM port for operation. For instance, if COM ports 1 thru 3
are in use by other peripherals and applications, the CANUSB will use COM 4.
The CANUSB functions identically to a COM port from the reference point of both the host application and
the serial device, and it can support serial device control requests defined in the Microsoft Win32
®
Communications API.
The Virtual COM Port (VCP) device drivers allow the CANUSB device to appear to the PC's application
software as an additional COM port (in addition to any existing hardware COM ports). Application software
running on the PC accesses the CANUSB device as it would access a standard hardware COM port.
However, actual data transfer between the PC and the CANUSB device is performed over the USB.
Therefore, existing COM port applications may be used to transfer data via the USB to the CANUSB-based
device without modifying the application.
2.1.2.4 Windows CE 4.2-5.2
The drivers for Windows CE includes the following versions of Windows CE 4.2-5.2 based operating
systems: Windows Mobile 2003, Windows Mobile 2003 SE, Windows Mobile 5, Windows Mobile 6,
Windows Mobile 6.1 ,Windows Mobile 6.5
Please read the application note Windows_CE_Installation_Guide.pdf. The purpose of this document is to
provide users of FTDI chips with a simple procedure for installing drivers for their devices on PDAs and
targets running Windows CE 4.2 and later. The application note and drivers files are contained on the
software CD in the Windows CE 4.2-5.2 folder.
2.1.2.5 Windows CE 6.0
Please read the application note Windows_CE_Installation_Guide.pdf. The purpose of this document is to
provide users of FTDI chips with a simple procedure for installing drivers for their devices on PDAs and
targets running Windows CE 6.0 and later. The application note and drivers files are contained on the
software CD in the Windows CE 6.0 folder.
2.1.3 COM Port Assignment
COMPort_Assignment is a utility which is used for assigning the COM Port numbers of FTDI devices. The
utility is available as a free download from the Utilities page of the FTDI website. Please read the
AN_160_COMPort_Assigment_User_Guide.pdf for installation and operating instructions. The application
note and the Reassign COMNo Utility.zip file are contained on the software CD.
2.1.4 USBView
USBView is a free utility from Microsoft that displays the USB connection tree and shows the USB devices
that are connected to it together with their configuration data. This is very useful for debugging USB
enumeration errors. USBView runs under Windows 98, ME, 2000 and XP.