I sent AT command to 2901 under asynchronous mode.
ATY1 [set synchronous mode]
ATDTxxxx
I got response from 2901.
Connect 1200
I think, 2901 should enter on-line mode, and output TxClk after the
link is successfully established. But at at this time, there are
nothing on the pin RxClk & TxClk of 2901.
My problem: How can I get the TxClk & RxClk? It's necessary for the
SDLC transceive.
I'm waiting for your suggestion.