In order to run the combined S800 + Gretina daq, the following steps need to be taken:

1. Make sure that the external synchronization and external clock are enabled in the S800 ULM trigger module. Edit file CC0105Begin.tcl in directory /user/s800/converged_daq/Scripts, and set the values of the variables extsynch and extclock to 1.
2. Run the S800 ReadoutGUI for the S800 data acquisition system as you normally would on spdaq19, and click the Start button.
3. Log in using the experimental account to ddasdaq3 or any other of the systems dual homed to the GRETINA/NSCLDAQ network.
4. Use command godaq to run the Readout control program.
5. Click the Start button. This will grab remote control over the S800 Readout GUI. The S800 daq will now be in slave mode.
6. You should now be able to start runs as needed in the experiment's ReadoutGUI running on the dual homed system.

You can check the ring buffers using the command /usr/opt/nscldaq/xxxxx/bin/ringbuffer status, where xxxxx is the nscldaq version (as of March 2016, 11.0-020). If everything has started correctly you should have the following ring buffers in the dual homed system (e.g. ddasdaq3):

• experimental-user-name (e.g. e14045): This ring is where sampled coincidence data is placed. This is done via a tapcat, glom pipeline.
• spdaq19.rawccusb: It will provide raw data from the S800 CAMAC crate.
• spdaq19.rawvmusb: It will provide raw data from the S800 VME crate.
• spdaq19.s800filter: It will provide the event built, reformated data from the S800 Filter. During a run, data are pushed from this ring into the GRETINA GEB.

In addition to the normal stagearea structure in the experiment account, three directories are added that will be used to store raw S800 data:

• ~/stagearea/rawccusb: Event files containing raw CCUSB data from the S800.
• ~/stagearea/rawvmusb: Event files containing raw VMUSB data from the S800.
• ~/stagearea/s800filter: Event files containing event build, reformatted S800 data from the S800 Filter.