What is the basic requirement to implement RDM?

[sblair]

One thing to amend Nigel's post...

In RDM the minimum transmit time for the Break is 176uS and not 88uS. Minimum receive time is 88uS. In practice of course it is always good to transmit a bit longer than the minimum to be safe.

In terms of Full-Duplex/Half-Duplex I'd say it is really more about how you connect your TxD and RxD lines to your RS485 transceiver than anything.

[Nigel Worsley]

Originally Posted by sblair

In RDM the minimum transmit time for the Break is 176uS and not 88uS.

I stand ( well, sit actually... ) corrected!

I don't have a copy of the RDM spec to hand, I was intending to check that figure this evening. This means that the UART will need to be run at 50kbps or slower for the first method that I suggested to give the correct timing.