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All THVDXXXX devices have open, short, and idle bus failsafe built-in. The THVD2410 specifically has the highest range of fault protection up to +/-70V on the bus. However these are standard 1 transmitter, 1 receiver devices.
If 2 receivers are still required, you can use a 2 THVD1400s as receivers only for example. All THVDXXXX devices are complaint with both RS-485 and RS-422 standards. We currently do not have differential receivers with open and short circuit protection.
I realized that I might have misunderstood your question. Are you seeking a device that merely protects against short circuit condition (my assumption), or are you seeking a device that has separate output pin that flags when there is a fault on the bus? All of the devices I mentioned above do not explicitly flag if there is a fault.
Most faults result in both lines being pulled together through the termination resistors, which results in a differential bus voltage of 0 V. This can be detected by connecting two receivers with exchanged A/B pins; when both output high, the bus is in an invalid state.
When you do not have external fail-safe resistors, this triggers also when the bus is idle.
