-----Original Message----- From: L.V.Gandhi [mailto:[EMAIL PROTECTED] Sent: Monday, August 04, 2003 8:59 AM To: [EMAIL PROTECTED] Subject: [newbie] usb to serial adapter
Nowadays only one serial port is coming in most of the p4 boards. I need two serial ports one for external modem and other for handheld connection. How far usb to serial adapter can help in this? Any problems faced by list users? -- L.V.Gandhi 203, Soundaryalahari Apartments, Lawsons Bay colony, Visakhapatnam, 530017 MECON, 5th Floor, RTC Complex, Visakhapatnam AP 530020 INDIA ******************************************* I found some things that might be of use. I don't know what kind of equipment you have but here are some interesting sites as well as an email regarding a similar issue. I think that you can plug a USB expansion adapter into your USB port and then run multiple adapters from that, but I've never had a need to try it as I build my own PC's and use boards that are upgradeable. Most stuff on the market is very limited and proprietary. COM ports: http://www.1-computer-hardware.com/Computers-PARALLELSERIAL-PORT-CARDS-1.asp USB to PS2 adapters: http://www.tigerdirect.com/applications/SearchTools/search.asp?kb=y&sourceid =1341&keywords=ps2%20usb%20adapter USB to DB9M: http://www.tigerdirect.com/applications/SearchTools/search.asp?kb=y&sourceid =1341&keywords=usb%20serial%20adapter [Handhelds] usb to serial Jim Pick [EMAIL PROTECTED] 26 Jul 2000 12:16:26 -0700 Previous message: [Handhelds] usb to serial Next message: [Handhelds] usb to serial Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] ---------------------------------------------------------------------------- ---- "Ali Memarsadeghi" <[EMAIL PROTECTED]> writes: > I currently have an ipaq and am trying to put linux onto it. I need > to convert the usb cradle to serial cable and was looking at the > how-to page on the subject. Am I correctly interpreting the table > (http://cvs.handhelds.org/minihowto/h3600-serial-cable.html) in that > I simply connect the pins listed in each row of the table together? > Also, I opened up the ipaq cradle and looked at the chip inside. > The wiring looks like it would need to be very precise. Not having > played around with hardware too much, I was wondering if anybody > could give me some suggestions as to the best way for me to go about > wiring the pins. It took me a few days to figure out how to do it, but I finally managed to build such a cable. You can rip the USB cradle apart, and re-use the little circuit board found inside (with the attached connector) to build a serial cable that works. Here are some pictures of my cable: http://www.jimpick.com/pub/photos/2000/ipaq/homebrew-ipaq-cable.jpg http://www.jimpick.com/pub/photos/2000/ipaq/homebrew-ipaq-cable-closeup.jpg The connnector on the internal side of the little circuit board is a 14-pin Hirose DF13 Series, which you can get from www.digikey.com. All you need is the nylon connector (DF13-14S-1.25C, 33 cents each) and some crimp contacts (DF13-2630SCF, $3.45/100). Don't bother getting the crimp tool ($989.81) -- you can use a regular crimp tool instead. Theoretically, you can just use the same existing connector that the USB cable is wired into, so you could have a dual USB/serial cable. Apart from that, you need some wire, and a standard DB9 connector on the other end. The pinout on the website is only valid for the external connector. The internal connnector has the pins in different positions. I had to figure out the pinout manually (I started the project before the external pinout was posted on the website). But I have verified that everything makes sense. Here's the pinout: External Internal (Hirose) DB9 Signal (DTE=PC, DCE=iPaq) -------- ----------------- --- ------------------------- 5 2 7 RTS 6 3 8 CTS 7 4 2 RXD 8 5 3 TXD 3 6 6+1 DSR + DCD 9 7 4 DTR 4,10 9 5 Ground Have fun. :-) Cheers, - Jim p.s. That's kaffe running the same demo I was showing off at OLS.
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