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CC2640R2F: Direct Testmode

Part Number: CC2640R2F
Other Parts Discussed in Thread: BOOSTXL-RS232, , CC2640

Hi,  we bought a Low energy CC2640R2F wireless MCU LaunchPad & Boostxl-Rs232. Now I want to set it into direct testmode (BT 5)
I guess I did it last time ( older development kit from TI) with btool and loaded a hex file for DTM.

I am not capable to get a connection with btool to the board. With the old board it is no problem (Settings: HCI, 57kBaud, RTS/CTS)

What are the setting to communicate with the board ? And how can I set teh board into direct Testmdode.

Thanks in advance