[subexp-daq] Question: what is GEOM?

[Håkan T Johansson]

Dear Günter,

I think nurdlib will assign the geom numbers (for modules which have that 
kind of identifier settable) in order for the modules that are configured.

Unless not already implemented, it might be on Hans todo-list to be able 
to override that default, i.e. manually specify the module identifier that 
appears in the data.  That would be useful such that an unpacker can be 
used unchanged even if some detector/module is not present for some runs / 
experiments.

Cheers,
Håkan



On Fri, 19 Apr 2024, Weber, Guenter Dr. wrote:

> 
> Dear friends,
> 
> 
> in my DAQ, I have three modules that are defined in main.cfg as follows:
> 
> 
>     # ADCs
>     CAEN_V785(0x11110000) {
>         threshold = (0 {32})
>     }
>     CAEN_V785(0x44440000) {
>         threshold = (0 {32})
>     }
>     # TDC
>     BARRIER
>     CAEN_V1190(0x22220000) {
>            blt_mode = noblt
>            edge = leading
>            resolution = 100 ps
>            deadtime = 5 ns
>         # with 100 ps resolution, max window size: 50 us
>            GATE {
>             time_after_trigger = -1us
>             width = 2us
>            }
>     }
> 
> In the corresponding *.spec file, the data is matched via this commands:
> 
> 
>     adc[0] = VME_CAEN_V785(geom=1, crate=0);
>     adc[1] = VME_CAEN_V785(geom=2, crate=0);
>     b2 = BARRIER();
>     tdc = VME_CAEN_V1190(geom=3);
> 
> My question is now, where is the GEOM number coming from? How do the modules
> 'know' that they should have GEOM numbers 1 to 3?
> 
> 
> 
> Thank you very much!
> 
> 
> 
> Best greetings
> Günter
> 
> 
> 
>