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USB-COM232-PLUS2 Datasheet(PDF) 19 Page - List of Unclassifed Manufacturers |
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USB-COM232-PLUS2 Datasheet(HTML) 19 Page - List of Unclassifed Manufacturers |
19 / 24 page Copyright © 2010 Future Technology Devices International Limited 18 Document Reference No.: FT_000147 USB-COM232-PLUS2 Datasheet Version 1.1 Clearance No.: FTDI# 96 8 Troubleshooting 8.1 Hardware Cables are the most common sources of trouble with external devices. Check the following: - USB cable is properly inserted at both ends - Computer power is ON - Computer is not in Sleep or Standby - If a USB Hub is used, be sure it is set for “Self-Powered” operation - If a USB Hub is used, be sure all cables are properly inserted - If all the above are OK, the Yellow LED should be lit, indicating the device has been recognized by the USB subsystem. RS232 cables – check the following: - Output signals (TXD, RTS, DTR) are connected to the respective inputs (RXD, CTS, DSR) in each direction. - Check for specific handshake requirements of your RS232 peripheral. - If handshake signals are note used, ensure the application is set to “No Hardware Handshake”, or equivalent. - Test the port with a loop-back connector. Connect TXD to RXD, RTS to CTS and DTR to DSR. Use a simple terminal program to check that data is transmitted and received. 8.2 Device Driver Ensure the latest device driver is in use. See www.ftdichip.com If other devices with FTDI chips are installed in the system, check with all manufacturers of these devices for the latest device drivers. See the FTDI installation guides for additional details: http://ftdichip.com/Documents/InstallGuides.htm Common Windows Device Driver Troubles: DEVICE TIMES OUT: The default settings of the device driver assume typical data transfers of hundreds to thousands or more bytes at a given time. Some applications, such as a GPS device, only send data in short packets, often only a few bytes. If this is the case, it may be necessary to adjust the driver buffer size and/or latency timer to smaller values. These values can be adjusted through the Advanced driver options as noted in Figure 2.13. The buffer size can be reduced to 64 bytes. The latency timer can be set as low as 2ms. A setting of 1ms will cause unnecessary USB traffic and could adversely affect data transmission. ERRATIC MOUSE POINTER: The device driver defaults to query an attached device to find out whether it is a mouse or modem, consistent with native COM port operation. Some RS232 peripherals constantly send short packets of data, causing the host system to “think” a mouse or modem has been attached. These short packets will interfere with normal mouse operation causing the pointer to jump around the screen. If this happens, disconnect the RS232 device and uncheck the Serial Enumerator option, also found on the Advanced driver options screen in Figure 2.13. COM PORT IN USE: Windows keeps track of all COM port assignments. If multiple FTDIChip products have been connected to a single system, the COM port number will increase, even if the other devices are not attached. If the higher COM port assignments are not acceptable for the application, known unused COM port numbers should be uninstalled according to the FTDI installation guide: http://ftdichip.com/Documents/InstallGuides.htm. |
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