GTCO Summagraphics ADB Interface - Users Guide - Manual (Page 7)

Summagraphics 7
2. Connect the tablet to the ADB adapter box.
The ADB kit contains a PC cable with a 25-pin D connector and a phone connector.
Plug the 25-pin D connector of the PC cable into the RS-232 port on the
Summagraphics LCL controller.
Plug the phone connector into the tablet socket on the ADB adapter box.
3. Attach the ADB adapter box to the computer.
The adapter box has two ports, labeled with the ADB icon:
Plug either end of the ADB cable into one of the two ports.