The MAX5491PC02000 has a Resistor Ratio of 2:1. The Resistor Ratio is R1/R2. Pin 1 to Pin 3 is the R1 resistance and Pin 2 to Pin 3 is the R2 resistance. Given there is a 30k ohm end-to-end resistance in the device, 20k ohm should be seen between pins 1 & 3 and 10k ohm should be seen between pins 2 & 3.