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Problems with UART communication between MSP430FE427 and CC2431

Other Parts Discussed in Thread: MSP430FE427, CC2431

[Problem:

        My problem relates to Serial port communication between MSP430FE427 & CC2431. I need to send some data (characters)through serial port in UART mode to CC2431 and then, it will again be sent to other zigbee devices using mesh.  

       Presently MSP430FE427 is able to send data to a computer system (PC). A  PC to CC2431 EM  through serial port communication is also OK.   

   But from MSP430FE427 to CC2431 is not working properly. Please Help me.]

 

[Steps Needed to Recreate Problem:

 Serial port Communication 

MSP430FE427 ------------------> PC System     -- OK   

PC System ----------------------> CC2431        -- OK   

MSP430FE427 -------------------> CC2431       -- Not OK  

      All the configuration settings are set at 38400, 8 bits -No Parity-1 stop bit - No Flow control - same for all devices.    

Oscilloscope waveforms:       PC data is at a level of -10V with positive pulses(data) with a height of 23.2 Volts. (+13.2 V above ground)      MSP430FE427 data is at a level of +3.2V with negative pulses(data) with height of 3.2V (upto ground)

]