(tutorial-load-save)= # Commandline Load/Save Tutorial This tutorial shows how to use the commandline tool to save the state of all the Blocks and Fields in a PandA, and load a new state from file. It assumes that you know the basic concepts of a PandA as outlined in the PandABlocks-FPGA blinking LEDs [tutorial]. ## Save You can save the current state using the save command as follows: ``` $ pandablocks save ``` The save file is a text file containing the sequence of pandablocks control commands that will set up the PandA to match its state at the time of the save. This is a human readable file and may be edited if you want to modify a few fields. e.g. the first few lines of the tutorial save file look like this: ```{literalinclude} ../../src/pandablocks/saves/tutorial.sav :lines: 1-12 ``` ## Load To restore a PandA to a previously saved state use the load command as follows: ``` $ pandablocks load ``` This is equivalent to typing the sequence of commands in \ into the pandablocks control command line. To load the preconfigured tutorial state: ``` $ pandablocks load --tutorial ``` The tutorial sets up a Seqencer block driving 3 Counter blocks and a Position Capture block. This configuration is the starting point for the next tutorial: {ref}`commandline-hdf` :::{note} The Web UI will not change the Blocks visible on the screen when you use `pandablocks load`. If you want all the connected Blocks to appear in the UI then restart the services on the PandA (Admin > System > Reboot/Restart) ::: The tutorial blocks are wired up as shown in the following Web UI layout. ```{image} tutorial_layout.png ``` [tutorial]: https://pandablocks-fpga.readthedocs.io/en/latest/tutorials/tutorial1_blinking_leds.html