Com1 port problems
in [Hardware]
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From: Srikanth on 28 Feb 2006 12:16 Hi Can anyone tell me where the COM1 port is located in a PT-5VMD motherboard? I need to connect some hardware to the com1 port, but though windows tells me the port is fine, the software tells me it can't detect anything. It turns out that the com1 cable was free hanging in the cabinet, and i need to know where to connect it internally. Also, is there a simple test to tell me if everything is fine with the port? Thanks Srikanth.
From: Paul on 28 Feb 2006 14:55 In article <1141146986.295239.307580(a)v46g2000cwv.googlegroups.com>, "Srikanth" <skt(a)xdtech.com> wrote: > Hi > > Can anyone tell me where the COM1 port is located in a PT-5VMD > motherboard? I need to connect some hardware to the com1 port, but > though windows tells me the port is fine, the software tells me it > can't detect anything. It turns out that the com1 cable was free > hanging in the cabinet, and i need to know where to connect it > internally. > > Also, is there a simple test to tell me if everything is fine with the > port? > > Thanks > Srikanth. http://web.archive.org/web/20001215110200/http://www.azzaboard.com/pt5vmd.html The www.azzausa.com site is still alive, but the info there is useless for answering your question. http://www.adelong.com.au/products/mainboard/azza/MBAZZ000.htm Maybe there is a nine pin header socket on the motherboard ? I cannot find a high resolution picture, and this is about the best there is. http://home.att.ne.jp/alpha/pcboard/0304NN.jpg There are at least two different standards for adapter cables. These devices convert from a nine pin (2x5, one pin missing) header, to a PCI slot bracket mounted serial port connector. http://www.pccables.com/07120.htm http://www.pccables.com/07121.htm Hope that points you in the right direction. Paul
From: Srikanth on 28 Feb 2006 19:03 Hi Thanks, I think the com port is the two slots at the top left - the white/black connectors adjacent to each other. Is there a simple test for me to figure out whether the port is working? Thanks Srikanth.
From: Paul on 28 Feb 2006 20:16 In article <1141171384.595163.278060(a)i39g2000cwa.googlegroups.com>, "Srikanth" <skt(a)xdtech.com> wrote: > Hi > Thanks, I think the com port is the two slots at the top left - the > white/black connectors adjacent to each other. > > Is there a simple test for me to figure out whether the port is > working? > > Thanks > Srikanth. Well, first of all, RS232 signals cannot be damaged by connecting them together. If you were to accidently connect the TXD of one port, to the TXD of the other port, no permanent damage should result to the RS232 driver. The test I would use, is to open a Hyperterminal window with respect to each COM port. One Hyperterminal window for COM1 and one Hyperterminal window for COM2. Connect the TXD of one header, to the RXD of the other connector. When the cursor is in the Hyperterminal session of the connector you are using the TXD pin on, type a character. The character should show up in the other Hyperterminal window. You can connect the two connectors bidirectionally, like this. Then, your two Hyperterminal windows can carry on a "chat" session. Characters typed in one window, should show up as received in the other Hyperterminal window, and vice versa. COM1:TXD >>>>>>>>> RXD:COM2 COM1:RXD <<<<<<<<< TXD:COM2 It is also possible to tell a bit about the wiring, by looking at the voltage on the pins. I always have to refresh my memory, but I believe the TX has one voltage value, and the status signals have the opposite voltage value, in the idle state. Also, if you connect an analog voltmeter to the TX pin, you can sometimes see the needle on the meter deflect, each time a character is typed. So there are little tricks like that, for examining an unknown header. This guy tried to figure out the wiring on his P4C800-E serial ports. He has a little test program. http://home.att.net/~Tom.Horsley/p4c800e.html For the two Hyperterminal windows, you would want the two serial channels to have matching parameters. Like 9600 baud, 8-N-1 (8 data bits, no parity, 1 stop bit ?). Its been a while since I've used RS-232. Paul
From: kony on 1 Mar 2006 02:33
On 28 Feb 2006 16:03:04 -0800, "Srikanth" <skt(a)xdtech.com> wrote: >Hi >Thanks, I think the com port is the two slots at the top left - the >white/black connectors adjacent to each other. > >Is there a simple test for me to figure out whether the port is >working? > >Thanks >Srikanth. I would think the simple test will be connecting that device you need to use... and using it. |