The DIN rail mounted C-Bus PC Interface (or C-Bus PCI) is a C-Bus system device designed to provide a gateway between a PC and a C-Bus Network.
Part number for a C-Bus to PC interface is
5500PC - Provides an RS-232 interface into a C-Bus Network.
or
5500PCU -Provides a gateway between a PC and a C-Bus Network via USB connection.
For further information, please visit
5500PC
https://updates.clipsal.com/ClipsalOnline/Files/Brochures/C0000019.pdf
5500PCU
https://www2.clipsal.com/cis/__data/page/428/5500PCU%20data%20sheet2.pdf