User's Manual

Figure 4-4. Setting Serial Communication in PuTTY on Linux

Then open serial port in terminal and check, if you see any log printed out by ESP32.

The log contents will depend on application loaded to ESP32.

Notes:

• For some serial port wiring conﬁgurations, the serial RTS & DTR pins need to be

disabled in the terminal program before the ESP32 will boot and produce serial

output. This depends on the hardware itself, most development boards

(including all Espressif boards) do not have this issue. The issue is present if RTS

& DTR are wired directly to the EN & GPIO0 pins. See the esptool

documentation for more details.

• Close serial terminal after veriﬁcation that communication is working. In the next

step we are going to use a different application to upload a new ﬁrmware to

ESP32. This application will not be able to access serial port while it is open in

terminal.