A D Sub cable is a common D-shaped electrical connector that goes into a D Sub port.
D Sub Ports are how some monitors connect to computers.
The connector of the bridge head contains nine pins with different functions corresponding to their terminals. Check the shape and pin assignment of the connector before connecting the connector shell to the accessory cable B8023WP. See the full user's manual for a diagram of the bridge head connected to a measuring instrument (the DL750). Isolate the strain gauge before use. Do not connect the strain gauge terminal to any items with electric potential.