[Dxbase] COM Port Sharing

Sun Sep 25 10:58:58 EDT 2005

Bob,
Unless you set the IRQs specially on the serial cards, Com1 and Com3 
typically share IRQ4 and Com2 and Com4 typically share IRQ3.
Regards,
Jack
----- Original Message ----- 
From: "Bob Main" <bobmain1 at alltel.net>
To: "DXBase" <dxbase at mailman.qth.net>
Sent: Sunday, September 25, 2005 10:18 AM
Subject: [Dxbase] COM Port Sharing
> Last night I wanted to double check, again, what Jack was talking about
> concerning sharing COM ports and IRQs. This is what I found. I have XP 
> Pro
> for those wondering. If you go into All Programs\Accessories\System
> Tools\System Information you find a tab that lists Conflicts/Sharing under
> Hardware Resources. There it lists different things that share IRQs and
> other Resources. COM1 is not listed as sharing anything, this is the one 
> to
> my Mark V. The NetMos Multi/IO card is sharing IRQ 17 with the audio
> device, but when you go to the Device Manager to change one of them you 
> find
> that 1) Both items say "No Conflicts" and 2) It won't allow you to change 
> it
> even if you wanted too.
>>>> One other thing I just did is I have three (3) programs that use the COM
> ports (Hamsoft, OneTouch, and DXBase). Hamsoft has always used COM7 for 
> PTT
> control, and the rig control it is set to 'None'. OneTouch uses COM5 to
> talk to my wife's blood sugar meter. DXBase uses COM1 for the Yaesu and
> COM3 to the Kenwood. My modem uses COM4. Anyway I have had all three of
> these programs for at least 2 years with no problems between them. I just
> now started all three programs and went to the conflict tab mentioned 
> above,
> and saw no difference. So I don't think they are butting heads mostly
> because the way they are set now is the way they have been set for at 
> least
> 2 years.
>>>> So do not think COM/IRQ sharing is a problem. If I could find 10 ft 
> serial
> cables I would replace both of them although they haven't been messed with
> since they were installed. Not saying they didn't break a connection by
> some gremlin just seems odd it would happen to two different cables going 
> to
> two different radios and two different COM ports. If you know a way how I
> can test the COM ports to see that they are working both directions I 
> would
> like to know. I'm just hope to have this fixed by the end of Oct when the
> CQ WW SSB contest starts. Thank goodness I'm not into working contests 
> hot
> and heavy because I would be getting more nervous about this than I 
> already
> am.
>>>> I tried this before the reformat, but have not tried it since, but going 
> to
> shortly, I am going to try every combination of the DTR, RTS and CTS
> available and see if that works now. With my Kenwood I found the CTS
> blocked it totally when turned on. I have one last question before I 
> start
> this. In the Device Manager do you set the Port Settings there also, or
> just in User Options?
>>>> Bob
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