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THVD1451: THVD1451 application UART RX/TX to RS485
Yes, connecting the device this way would convert it from a full duplex implementation to a half duplex one. This would make sense if you are interfacing to a two-wire RS-485 bus. You could also consider a half-duplex version of the device like THVD1450, which may be simpler. In either case, the device could be used to translate between logic-level UART signaling and RS-485 differential bus signaling.
If you have any further questions on the usage of these devices please just let us know.
That will work. If you did want to use THVD1450 for some reason, you could tie DE to VCC and /RE to GND and it would be equivalent.
Will this node ever need to receive data from other nodes, though? If so, then you might want to revise your approach so that you have the option to disable the transmitter circuit (i.e., using a DE control pin). Otherwise, this node's transmitter will always be on and would prevent other transceivers from communicating on the bus. If you wanted to implement driver enable control but your UART does not provide this signal, then you may want to implement a logic circuit similar to the one in this reference design:
