The 34959A module is a plug-in for the Keysight 34980A basic unit.
It is designed in such a way that the user can put together his own functions in order to simulate functions within the measuring system or to set up control and monitoring units. For this purpose, a number of tools are available, such as a + 12 V and +5 V supply, 16 GPIO ports (General Purpose Input Output Ports) and 32 connections for driving relays.
The front plate has various cutouts to allow the installation of corresponding standard power strips. To be able to address this breadboard module, it can be programmed with standard read / write commands in SCPI.