Was this an old message?  I am actually using SIO2k and JoHo actually 
helped me get it working a while back. :)

-=> Andrew Leary wrote to Robert Wolfe <=-

 AL> Hello Robert!

 AL> 07 Sep 17 00:02, you wrote to all:

 RW> + 06 Sep 23:51:53 MAX  Begin, v3.01 (task=1)
 RW> ! 06 Sep 23:51:53 MAX  SYS0032:  Cannot open com port (com1)
 RW> ! 06 Sep 23:51:53 MAX  Communications driver not properly installed

 RW> However, whenever I run Maximus/2 in WFC mode, I do not get the above
 RW> error message.

 AL> Do you have the port-sharing parameter added to your SIO command line
 AL> in CONFIG.SYS?

 AL> ie:

 AL> DEVICE=C:\SIO\SIO.SYS (COM1,3F8,IRQ4,-) (COM2,2F3,IRQ3,-)
 AL> (COM3,INTERNET:3E8,NONE:IRQ4,-) (COM4,INTERNET:2E8,NONE:IRQ3,-)

 AL> This is for a standard COM1 and COM2, and virtual COM3 and
 AL> COM4.  The dash (-)
 AL> parameter enables sharing the port between applications.

 AL> Andrew

 AL> --- GoldED+/LNX 1.1.5-b20170303
 AL>  * Origin: Phoenix BBS * phoenix.bnbbbs.net (1:320/219)

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--- Maximus/2 3.01
 * Origin: Neptune's Lair * Olive Branch, MS * os2bbs.org (1:116/17)