Connecting from PC to Comfort

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Do you mean that the UCM01 has an Ethernet port instead of RS232, see attached photo?
If so you need the DS Manager to configure the IP address, download from https://www.cytech.biz/Default.aspx?cmd=sQ0OYE9X66w%2b0P%2bAcFsmAI3j73Rwtfrj&fileid=201&dcid=4&pageindex=

The UCM/Ethernet can be connected to the network by a straight LAN cable or to the PC by a crossed network cable
Refer to the UCM Manual  at https://www.cytech.biz/Default.aspx?cmd=sQ0OYE9X66w%2b0P%2bAcFsmAI3j73Rwtfrj&fileid=31&dcid=3&pageindex= wven though this relates to the new Comfort II UCM