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Topics - Me123

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Hello.  I'm using the FTD2XX.dll to interface to a FT232RL chip and was noticing some odd behaviour.  I've turned on event characters and when I send a series of packets that are exactly 62 bytes (including the event character) then there is a very long delay before the data is available to my application.  I've read application note AN232B-04 a few times and this behaviour makes sense if I don't have event characters turned on, as the rate I am sending data back and the value of the latency timer means data wouldn't be sent until the USB buffer is full.  But as I have event characters turned on shouldn't the USB buffer be flushed every time an event character is seen in the data stream, or have I misunderstood something?

Many thanks

I've just got a new laptop (Windows 7 64bit) and I'm having an issue whenever I plug in a new FTDI USB to serial device it installs with the same COM port number.  I can have two devices plugged in at the same time with the same port number, which is obviously a problem.  This didn't use to happen on my old 32 bit Win 7 laptop, and it doesn't happen on some other laptops with 64 bit Win 7 I've tested it out on so I presume it is some issue with my laptop, I just can't think what it is.  I've tried uninstalling/reinstalling the drivers but that didn't help, I'm not sure what else to try. Does anyone have any idea?  Thanks.

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