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The -s specifies the serial number used (00000000 is the default one for Optoboard V2.1), -G is the link number of FELIX and -d the FELIX device. If -s is set to 00000000 and -v 1.3, optoboard_felix sends the parameters in the config ~/optoboard_felix/configs/optoboard_lpgbtv1_gbcr2_vtrxv1_3_default.json to the lpGBTs, GBCR and VTRx+. Check the FELIX documentation or the optoboard_felix readme for more information on this.
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