THVD2410: Does THVD2410DR support loopback testing.

This is a half-duplex transceiver, i.e., the bus inputs and outputs are always connected together. When DE is high and /RE is low, then you have a loopback.

Please note that it is not possible to have a loopback while disconnecting the driver from the bus.

Hi Leo,

Yes. Every RS-485 half duplex transceiver has this internally. 

Best,

Ethan