usb to serial
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From: Charlie on 4 May 2008 10:00 On Sun, 4 May 2008, Ron Johnson engaged keyboard and shared this with us all: >--} On 05/04/08 02:44, Charlie wrote: >--} > On Sun, 4 May 2008, Ron Johnson engaged keyboard and shared this with > us all: --} >> --} On 05/04/08 00:54, Charlie wrote: >--} >> --} [snip] >--} >> --} > >--} >> --} > I have used a USB to RS232 Cable for some years with Linux > Debian, --} >> coupled to --} > an external dialup modem and it worked a > treat without --} >> fault. It was not a --} > fancy brand named cable, > just one that I picked --} >> up in a computer shop, and --} > was about 1 > metre long I think? I haven't --} >> used it with testing for about 3 --} > > months because I now use satellite. --} >> So something may have changed > since then? --} >--} >> --} What does it's lsusb entry look like? >--} > >--} > Unfortunately I can't tell you because I no longer use it. But it was > plugged --} > into a four port comsol powerless USB hub, and was found by > pon without any --} > problems. I have forgotten how I set it up, no wait, > I used it straight from --} > the install of Sarge, and then it just kept > working. I never had reason to --} > query it or if I did, I have > forgotten. >--} > >--} > Sorry I can't be of more help. the modem was a Maestro Woomera dialup > modem if --} > that's any help. >--} >--} All you need to do is plug the adapter into an open USB jack. No >--} need for modem, kernel module, etc. Bus 005 Device 003: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC HTH Charlie -- Registered Linux User:- 329524 *********************************************** Baby mice in their nest Squeak in response To the young sparrows. -------BASHO *********************************************** Debian, just the best way to create magic _______________________________________________ -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org
From: Pigeon on 4 May 2008 12:20 The Linux kernel has support for these: http://www.ftdichip.com/Products/EvaluationKits/USB-Serial.htm -- Pigeon Be kind to pigeons Pigeon's Nest - http://pigeonsnest.co.uk/ Lucy Pinder Television - http://www.lucy-pinder.tv/ GPG key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x21C61F7F
From: Douglas A. Tutty on 4 May 2008 13:00 On Sun, May 04, 2008 at 05:20:23PM +1000, Daniel Dalton wrote: > On Sun, 4 May 2008, Celejar wrote: > I found this: > http://cgi.ebay.com/USB-to-RS232-Serial-DB9-9-Pin-Cable-Adapter-Converter_W0QQitemZ140230142593QQihZ004QQcategoryZ41995QQssPageNameZWDVWQQrdZ1QQcmdZViewItem > > Will this work for what I want? > (my braille display has a standard serial port on it.) > Note that the serial port on my braille note has mail converters (so has > pins in it not holes) > > Will this work for what I want? > > If you can get back to me before the add ends I will get it. I can only address the male vs female thing: it doesn't matter re the driver, however, since computers themselves generally have male serial ports, you will need a gender-changer to connect your male braille to a male serial port. I used-to-would-have said that any computer store should have a 9-pin serial gender-changer but that may not be true anymore. If your local store doesn't have one, you have a couple of options: 1. See if there is one on ebay and get it with the adapter. 2. Order one from your computer store: they are still made: Belkin or Startech should have them. 3. If you know someone who can get a male and a female and a shell, they can solder one together for your. There are no electronics in a gender-changer so you don't need to worry about compatibility. For details, you can checkout the serial-HOWTO (in the doc-linux-[html] package, or on the ldp website. Good luck. Doug. -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org
From: Bob Proulx on 4 May 2008 16:30 Daniel Dalton wrote: > - a supported usb to serial cable for linux that works with the kernel? > (If so could you please provide a model number or brand?) Or even better > if you know where I can get one of these from? I bought two of "Parallax USB to 232 Serial Adapter" recently and they work very well for me. Here is a URL to where I bought them. http://www.hobbyengineering.com/H3284.html It is a very small PC board with a mini USB B connector on one side and a 9-pin male rs-232 connector on the other side. It has a clear tube shell around it and the components can be seen through it giving it an "engineering" use look. Use a commonly available USB A to mini-B cable to connect it to the USB port. It uses the ftdi_sio driver natively in the Linux kernel. When attached to a system udev will create /dev/ttyUSB0 automatically. It works very well for me. Other products have been available that use the same FTDI chip but are packaged in different types of packaging. I think that anything that uses the FTDI chips will be compatible with the drivers in the Linux kernel. Hope that helps, Bob
From: Joe on 4 May 2008 16:40
Celejar wrote: > These adaptors are 'smart', i.e. they contain electronics to do the > conversion, so as with hardware generally with linux, what counts is > the chipset. I believe that many of these devices use the Prolific > PL2303 chipset, which shows up with 'lsusb', at least in my case, as > "ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port". This > chipset has kernel support via the pl2303 driver. I have another > adaptor whose ID apparently isn't in the database; nothing shows up > other than the numerical ID. It is also grabbed by pl2303 (although > IIANM, that wasn't the case several months ago, when I first acquired > it), but it doesn't seem to be working properly, as opposed to the > Prolific one, which works fine. > > I purchased both my adaptors on Ebay. They are virtually identical in > appearance, except for color; both have attractive silver cables > sheathed in clear plastic, but the Prolific has black plastic covering > the two cable ends (serial and USB), while the other has translucent > green. This may not help you. > > I originally bought these adaptors to use with serial modems, but I was > never able to get them to work properly, and I never figured out why. > I'm currently using the Prolific to manage a headless box via a serial > (null modem) cable, and it works perfectly. The other one is not > working properly, as above. > Unfortunately, 'serial', and even 'RS232' (which *only* specifies voltage levels) are not one but a whole family of communication methods. While the send and receive pulse structure is fairly standard, the handshake methods are not. 'Proper' serial ports with 25 pins have a range of old-style modem control and handshake lines, of which a few are implemented in the 9-pin version. There are no real standards as to which control lines are used for which purposes, or which control lines they are connected to at the other end. Sometimes, connector pins at either end are linked together, and often do not connect to the other equipment at all. That's why two pieces of equipment can work together with some cables and not with others. It's not that the non-working cables are necessarily faulty, they may just be wired differently. There's no such thing as a 'standard' serial cable. Also, serial ports may not be used in the expected way. Sometimes the control signals are used alone, without transmit or receive lines being involved. Older UPS equipment used serial cables to tell the computer to shut down when there were power problems, and usually only one or two of the control lines were used, not the data lines. And here's where we get to the point: while all USB-serial adaptors will handle the data correctly, they don't all manage the control lines in the same way as a real serial port. I have a serial-port microcontroller programmer which nearly works using a USB adaptor, but it's unreliable and occasionally wrecks a microcontroller. This is because the programmer and its software make use of the control lines to switch voltages. It works perfectly on a proper serial port, even a nine-pin one. So there's no way at all to predict whether a particular piece of equipment, or particular software, will work with any or all USB-serial ports. Probably it will, but the only way to be sure is to try it. -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org |