Greg, Thank you for your reply! My answers are below.
> On Mon, Sep 22, 2003 at 03:49:58PM -0500, Joel L. Breazeale wrote: > > Folks, > > > > I need some help. I have tried four serial-to-USB adapters and have yet to > > find one that works with RedHat 7.3, version 2.4.18-3 kernel. I need to have > > the stated kernel without a recompile. At this point changing kernel is not > > possible. Here's what's been tried so far: > > Why is it "not possible"? You want to run a kernel that has known > security problems? :) The constraints I'm working with are due to mandates for the project. The matter of updating the kernel is being considered. The serial-to-USB issue just adds fuel to the fire. 8-) > > * Inside Out Networks Edgeport/1 - requires kernel version 2.4.20; > > * Keyspan USA-19QW - requires kernel 2.4.18-3 modification and recompile; > > * Belkin F5U103 - flat out didn't work though all indications said it should; > > * IOGear G-UC232A - sometimes drops the first character it receives > > (only once after app restart and only sometimes). > > > > The IOGear is the only one that was close to working. It's fatal flaw is the > > dropping of the first character of a string transmitted by a serial device -- > > the error was recoverable in one case but not in the other -- not acceptable. > > Any ideas why the first character might be dropped? > > What driver is this device using? Good question. To make sure there is no confusion I'll copy/paste all the relevant stuff from /var/log/messages: Sep 22 11:34:31 Grisham kernel: hub.c: USB new device connect on bus2/1, assigned device number 2 Sep 22 11:34:31 Grisham kernel: usb.c: USB device 2 (vend/prod 0x557/0x2008) is not claimed by any active driver. Sep 22 11:34:34 Grisham /etc/hotplug/usb.agent: Setup pl2303 for USB product 557/2008/1 Sep 22 11:34:34 Grisham kernel: usb.c: registered new driver serial Sep 22 11:34:34 Grisham kernel: usbserial.c: USB Serial support registered for Generic Sep 22 11:34:34 Grisham kernel: usbserial.c: USB Serial Driver core v1.4 Sep 22 11:34:35 Grisham kernel: usbserial.c: USB Serial support registered for PL-2303 Sep 22 11:34:35 Grisham kernel: usbserial.c: PL-2303 converter detected Sep 22 11:34:35 Grisham kernel: usbserial.c: PL-2303 converter now attached to ttyUSB0 (or usb/tts/0 for devfs) Sep 22 11:34:35 Grisham kernel: pl2303.c: Prolific PL2303 USB to serial adaptor driver v0.9 Later in the day I tried the IOConcepts PDA USB Adapter (sometimes dropped the first character too): Sep 22 18:51:26 Grisham kernel: usbserial.c: PL-2303 converter now disconnected from ttyUSB0 Sep 22 18:51:45 Grisham kernel: hub.c: USB new device connect on bus2/2, assigned device number 4 Sep 22 18:51:45 Grisham kernel: usbserial.c: PL-2303 converter detected Sep 22 18:51:45 Grisham kernel: usbserial.c: PL-2303 converter now attached to ttyUSB0 (or usb/tts/0 for devfs) Sep 22 18:51:48 Grisham /etc/hotplug/usb.agent: Setup pl2303 for USB product 67b/2303/202 > > Can anyone out there give me a recommendation on a manufacturer that has a > > serial-to-USB adapter that works? > > The Edgeport and Keyspan devices _do_ work, if you don't insist on using > a known buggy and insecure kernel that is quite a few years old... Oh > yeah, there have been a _lot_ of USB fixes since that kernel release > too. I'll pass along your comment. I believe the latest kernel for RH 7.3 is 2.4.20-20.7. I should think that would be sufficient for the Edgeport and Keyspan to work without kernel modification/recompile, yes? > > [I've checked the LiNUX-USB device list. That's how I found the above devices. > > I'd really like to get someone with personal experience to respond. In the mean- > > time I'll keep checking items in the device list.] > > How about a dirt cheap pl2303 based device. That might work for your > application (although I would recommend a new kernel even for that > device...) For some reason PL2303 (no matter what manufacturer) has the chance of dropping the first character on the first read. My gut says is between one in five and one in ten the first character will be dropped, so using a PL2303-based device seems to not make sense. I'm going to try a Belkin F5U109 for yucks. > Some of the older keyspan devices will work too, if you can find them > around. Oh yeah, a Edgeport 2 or 4 port device (the older ones), and > the ConnectTech WhiteHEAT device should also work well, along with the > Digi Acceleport multiport device. But all of them are more than one > port devices and a bit more expensive. I'll keep those in mind. At this point we're going to have to seriously consider using a more recent kernel. Thank you again for your response! Regards, Joel Breazeale ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
