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  • #16
    Datasheet clearly state:
    the module has on-board serial interface (TTL) that is suitable for a direct connection to any host micro-controller UART or a PC system com port (page 4)

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    • #17
      That is correct, you said you connected it to a "usb to rs232 converter".

      RS232 is -12v to +12v (typically). TTL is 0 to 5v
      Mark

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      • #18
        but anyway....I will try with TTL circuit....

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        • #19
          works ok with proper TTL levels....subject closed thanks ESPsupport

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