"Hallo,
I forgot to mention that in the last few months I've been prototyping a new board using a transceiver from TI (CC1200) the results are surprinsing! With a very narrow bandwidth (11kHz @433MHz) and a form factor that's comparable with n920…"
RS232 is an interface standard the use of DB9 connector is a common practice but it's not mandatory unless you want to use a standard RS232 cable (that typically uses DB9 connectors) to interface to the between DCE and DTE.
Connecting…"
this's the simplified version of the interface board.
If you need a more compatc one without the RS232 level translator just ask I can update the design ASAP.
Also if you have a very narrow place to fit this in we can exchange the DB9…"