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Can not connect old device to COM1 under Windows 2000

Posted on 2003-03-08
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Last Modified: 2008-03-17
I am trying to communicate with an old (late 80s maybe?) device
over COM1.  I have used terminal programs and port monitors to test, but
alas there seems to be -no- data going back and forth over the COM
port.

Device is good (tested under DOS on another system) and cable
is good (tested).  Are there Windows 2000 settings or something
I need to change in order for it to be able to communicate
with this simple device over COM1?

Thanks!
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Question by:schlag
11 Comments
 
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by:CrazyOne
ID: 8094454
Do you have Win2000 drivers for this device? If not chances are you won't be able to use it.

What device is it?
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by:CrazyOne
ID: 8094456
Althoug this links isn't quite in line with what you have posted it still may hold some information that may be useful.

Troubleshooting MS-DOS-Based Programs in Windows
http://support.microsoft.com/search/preview.aspx?scid=kb;en-us;165214
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Expert Comment

by:ticktacksir
ID: 8094688
-Try a different cable if not already...it may need a null modem cable or it may need a straight through cable.  It might need a special cable with different pin outs as well.
-I don't know if your port monitors tell you what speed you serial port needs to be set at as well?  Make sure the speeds/parity and such is correct.
-Obviously simple but make sure that your com port is enabled on the computer your trying to use
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by:rid
ID: 8094692
If this device can be accessed through a terminal emulator, it should'n matter which O/S as long as the required terminal settings can be used. Have you checked the COM1 hardware? Is the port properly installed in win2000? Is it enabled in BIOS?

Some terminal programs are pretty unimaginative and may require "standard" port settings for the COM port (I/O address and a dedicated IRQ), while win2k likes to hide the hardware under the HAL.

Regards
/RID
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Author Comment

by:schlag
ID: 8094873
I think ticktacksir is on the right path with recommending a null modem cable.  Think I was using that on the DOS machine.  Will double-check later on when I get home.
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by:rid
ID: 8095054
If the "device" works OK on a DOS box, but not on the w2k box, using the same cable (which is obviously good), it may not be the cable that gives trouble...

/RID
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Expert Comment

by:heskyttberg
ID: 8096081
Hi!

You also need to have correct speed set on the com port.
This needs to be done in your terminal program.
Which speed device supports should be found in it's manual, if you have no manual try to get one, since gussing is almost impossible.

Regards
/Hans - Erik Skyttberg
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by:kiranghag
ID: 8097976
use hyperterminal to connect to the device using the required speed, parity and stop bit settings...
then you should be able to communicate with the device...

it would also depend upon your software coz, windows 2k will not allow the comp port access directly...
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by:rid
ID: 10044294
A pity there wasn't much useful feedback, as the Q was interesting. I think there are useful tidbits in all the comments.
/RID
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by:akboss
ID: 10276662

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