Why are you trying to connect on COM2 when you said the modem was installed on COM5? (most likely there is no COM2 on your system).
If I remmber right, Hyperterm may not offer COM5. The normal installation of a USR/3COM modem installs the modem on COM5, but also creates a Com alias on COM3. Try connecting there.
I was using COM2 because that's what the instructions in TT1012530 called for. I just assumed whoever wrote that knew what was right. I think when I looked in the BIOS there was only COM1, which should have been a clue I guess.
Is there a reason that only one com port would be listed in the BIOS? Where can I go to learn more about the port arrangements?
A COM port designation is really just a historical combination of base address and IRQ. The serial port on the back of your machine is configured to use the historical address IRQ definition of COM1. COM1 is the only real COM port the machine has, so that is all that is listed in the BIOS.
Many of the USR/3COM modems install themselves using a base address and IRQ that have historically been considered as COM5. In reality, it is not a true COM port, but simply a combination of address/IRQ. For legacy purposes (many older programs only recognize the address/IRQ combos that define Com1-4) the modem also installs an entry in the registry that redirects to the COM5 address/IRQ I/O directed at COM3.
I don't claim the above is totally technically correct or is the whole story, but I think it helps get the idea across.
fredopatz
4 Posts
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November 5th, 2003 12:00
Dave Lyle
2 Intern
•
2K Posts
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November 5th, 2003 15:00
If I remmber right, Hyperterm may not offer COM5. The normal installation of a USR/3COM modem installs the modem on COM5, but also creates a Com alias on COM3. Try connecting there.
fredopatz
4 Posts
0
November 5th, 2003 17:00
I was using COM2 because that's what the instructions in TT1012530 called for. I just assumed whoever wrote that knew what was right. I think when I looked in the BIOS there was only COM1, which should have been a clue I guess.
Is there a reason that only one com port would be listed in the BIOS? Where can I go to learn more about the port arrangements?
Dave Lyle
2 Intern
•
2K Posts
0
November 5th, 2003 18:00
Many of the USR/3COM modems install themselves using a base address and IRQ that have historically been considered as COM5. In reality, it is not a true COM port, but simply a combination of address/IRQ. For legacy purposes (many older programs only recognize the address/IRQ combos that define Com1-4) the modem also installs an entry in the registry that redirects to the COM5 address/IRQ I/O directed at COM3.
I don't claim the above is totally technically correct or is the whole story, but I think it helps get the idea across.