I just got the RN-42, and I am using a simple set-up where I just power the chip, and short-circuit the UART Rx and Tx pins, hoping that whatever I send from my "Tera Term" terminal will be returned back to me. But no..
The thing is that I can enter 'Command Mode', so I am certain that I can connect to the module, but then, when I exit Command mode (and presumably enter Data mode), I type characters in and nothing gets returned.
Furthermore, I tried opening a second terminal window, for the other port created by the bluetooth connection, but still, no data going back or forth (even though I am certain that by short-circuiting the Tx and Rx Pins, data should be displayed on the first terminal).
Oh yeah, and I also tied together the CTS and RTS pins just in case, but still, no results.
Here are the module's settings as retrieved using the D, E, and O commands:
***Settings*** BTA=000666639EDE BTName=RNBT-9EDE Baudrt(SW4)=115K Mode =Slav Authen=1 PinCod=1234 Bonded=0 Rem=NONE SET ***ADVANCED Settings*** SrvName= SPP SrvClass=0000 DevClass=1F00 InqWindw=0100 PagWindw=0100 CfgTimer=255 StatuStr=NULL HidFlags=200 DTRtimer=8 KeySwapr=0 ***OTHER Settings*** Profile= SPP CfgChar= $ SniffEna=0 LowPower=0 TX Power=0 IOPorts= 0 IOValues=0 Sleeptmr=0 DebugMod=0 RoleSwch=0 Ver 6.15 04/26/2013 (c) Roving Networks