From Datasheet, the threshold is from 1 to 3 mA, actually, t he max threshold is below 2.8mA if the operat ing temperature is above 25°C.
So, if the customer sets the MAX22190 input current (using the REDI resistor) to larger than 2.8mA, then the MAX14912 will not signal an OpenWire, when the two chips are connected.