This 4-wire station family with 18 keys is especially made for camera intercom.
It is possible to connect max.10 camera stations KV18 together.
Connector F1 (connector G1 for loop thru) is for camera 1-6.
Connector F2 (connector G2 for loop thru) is for camera 7-12.
Connector F3 (connector G3 for loop thru) is for camera 13-18.
Anyway each camera station can speak with their own cameras or all
camera stations can speak with the same camera.
Each combination is allowed.
For more 4-wire stations with 18 keys see the list on the left-hand side.