[subexp-daq] Question: what is GEOM?

[Hans Toshihide Törnqvist]

Dear Günter,

To add to Håkan's response, some Caen modules (maybe others?) can assign 
its geom via the middle PAUX connector if that's available. I think 
there's a config to make nurdlib aware that the module will have an 
externally assigned geom number, but maybe also via a flag in a status 
register. These are checked against the automatically assigned geom's, 
so the step to overriding is not very big.

Mostly fyi :)

Cheers,
Hans

On 2024-04-19 12:07, Håkan T Johansson wrote:
> 
> 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
>>
>>
>>
>>
>