780C Multi-Interface Interoperability Tester – User Guide Page 228September 29, 2014 Revision A113 Using the KeypadThis section provides information and procedures for operating the 780C with a keypad. The 780C can supportkeypad operation to enable efficient production test operation. An RS-232 numeric keypad is used for thisapplication. Supported keypad functions include selection of interface, timing, pattern, and test sequences.13.1 Connecting a KeypadA serial terminal keypad can be connected to the 780C front edge RS-232 connector.13.2 Enabling and Configuring an RS-232 KeypadThe RS-232 keypad must be enabled and configured from the 780C Preferences menu. Use the followingprocedures to enable a keypad.1. From the 780C Home menu, select the Preferences tab. The Preferences menu will be displayed asshown below.2. Navigate to the second page using the More button.