Hi user3445415, Welcome to the TI E2E Forums! I'm not sure I fully understand your issue. Is /DRDY not pulsing in your system? Would you have a schematic of your circuit that you can share? /DRDY is a driven output so there shouldn't be a need to add a pull-up resistor, unless you need /DRDY to be high before the ADS1256 has powered-up.
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