that is a function of whatever Software is communicating with Com2. MS-DOS itself does not use Com ports. You need to identify the software that is communicating with whatever is connected to the com ports and reconfigure it. Or better still, just change the device from Com1 to Com2.
If these are on-board ports then just go into cmos/bios setup and configure the ports the way you want them. If they're on an I/O card then configure the card's jumpers (or DIP switch) to give the correct values.
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