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About custom board for putty log?

I use nRF52840 demo board load the firmware(C:\sdk\nRF5_SDK_for_Thread_and_Zigbee_v4.1.0_32ce5f8\examples\thread\cli\ftd\uart\pca10056\blank\ses)

the putty can work well.and one of the demo board can output the log as a leadeder role, another can output the log as a router/chlid role

But as my custom board can not work on putty,

I had checked the hardware uart pin,the tx rx is the same pin,And I can run my custom board with the radio example.

What about this phemon?

this must use the hardware flow control?

My custom board had no enable connect it.

Thanks!