Velleman VMB1TSW - Manual (Page 11)

WIRING
To interconnect the Velbus modules the use of twisted-pair cable (EIB 2x2x0.8mm2, UTP 8x0.51mm - CAT5 or
equivalent) is recommended.
When a lot of modules (more than 10) are connected to the cable or longer cable lengths (more than 50m) are used, it
is important to use a cable with appropriate diameter (0.5mm² or higher).
Connect the bus to the module (beware of the polarity).
Connect the 12V to 18V direct current to the module (beware of the polarity).
Connecting the temperature sensor VMB1TS
Connecting the temperature controller VMB1TC / VMB1TCW(W)