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Original question:

CCS/LAUNCHXL2-TMS57012: Problem with using SCI port

LAUNCHXL2-TMS57012: SCI data not decoded on Tera term correctly

Suresh Jayagondar1
Prodigy 220 points
Part Number: LAUNCHXL2-TMS57012

Hi,

We are using SCI_TX and SCI_RX pin on Launch pad to send some basic data out to PC. ( Pin J11 - 32 GROUND, 33 - SCI RX , 34 - SCI TX )

TX pin on board is connected to RX pin on DB9 connector.

Data is decoded correctly on Logic scope 

When We try to see the data on Tera Term ( Serial com port ) its not decoded correctly. Baud rate is correct and all other setting for serial port looks correct

  • +1
    TI__Guru**** 196776 points

    Hi,

    TMS570LC12x has two SCI modules: SCI, SCI2/LIN. 

    On Launchpad, the SCI2/LIN signals are routed to TM4C129 MCU which converts SCI to USB. You can use SCI2/LIN to communicate with PC through USB port.

    The electrical and protocol characteristics of the TMS570 SCI peripheral are different from RS232. In RS232 communication, high level is typically +12 V and low level is typically -12 V, while the TMS570 SCI peripheral works with 0~3.3V. The RS232 transceiver should be used to transform the TMS570 SCI into RS232-compatible levels and vice versa.