Swaping CX ISA adapter to PCI adapter

An old multiport CX-ISA system installed a new Acceleport CX PCI card in a new computer with XP. Apparently, the daisy chained CCON concentrators canot be plugged to the new PCI card as it will not communicate with the CCON

Is there incompatibility of old CCON-C/X with new PCI cards ?

THanks

If the old C/CON modules do not connect to the new C/X PCI host adapter, then you presumably have the old metal C/CONs which have been obsolete for more than 10 years.
If your old C/CONs have plastic enclosures, then a new connecting cable may be all that is required.
The metal C/CONS are no longer supported.