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CC2650: USB-TTL test tool

Part Number: CC2650
Other Parts Discussed in Thread: CC2540EMK-USB

Hi,


I want to use PC to connect to the cc2650-lauchpad via a serial port, and lauchpad to receive data as a host


TXD is connected to RXD, RXD is connected to TXD, GND is connected to GND,When the adapter's RXD and TXD are shorted, the test result is OK, but the connection to lauchpad is NG

I don't know why.Thanks for any replies

Cheers

Simon