Messages in this thread | | | From | Thomas Stewart <> | Subject | Re: belkin usb serial converter (mct_u232), break not working | Date | Thu, 4 Nov 2004 19:20:21 +0100 |
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On Thursday 21 October 2004 20:44, Paul Fulghum wrote: > I looked at mct_232.h and noticed the comment: > > "There seem to be two bugs in the Win98 driver: > the break does not work (bit 6 is not asserted) and the > stick parity bit is not cleared when set once." > The driver was reverse engineered from the Win98 driver. > > Even though the LCR for this device is similar to > the LCR of a 16550 UART, some bits work differently. > > This suggests to me that either the device does not > properly support break, or that the break is > controlled through a different USB request and not > through MCT_U232_SET_LINE_CTRL_REQUEST > > The Linux and FreeBSD drivers do the same thing > for setting break, so no new info there. > I don't have access to the device or manufacturer docs. > > The only thing I can suggest is if you have > access to a Windows 2000/XP machine, try and generate > a break with the manufacturer provided drivers. > If you can't, then the device does not support break. > If you can, then maybe you can use USB sniffer > software to look at the USB requests going to the device.
I tried the converter on a XP machine and unfortunately while using the manufacturer provided drivers I was unable to produce a break :-(
As a last resort I tried Belkins tech support line. The first time I called I was told the product (F5U109ea) was designed for PDA use only and it would generate breaks fine if connected to them. Admittedly it is marketed as such (http://catalog.belkin.com/IWCatProductPage.process?Product_Id=103226). I was told to buy a F5U103 instead (http://catalog.belkin.com/IWCatProductPage.process?Product_Id=66002). Not happy with this I rang back to talk to another person, this time I was not fobbed off as quickly and although the tech support guy did not know what a break was, he offered to look into it and call me back. I've not heard back (yet), but I'm not too surprised.
Interestingly I got my hands on a F5U103 and it works fine (uses another chip and consequently module). However they are so much more bulky I don't think I'm going to bother changing over.
Thanks for all the help :-)
Regards -- Tom
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