Please re-power on and test it with the latest version of the parameter configuration software.
moreThe problem caused by the short circuit of P0.3 (TXD) and PROG pin; please contact the technical staff for detailed solutions.
moreCheck if the jumper cap is connected correctly.
morePlease determine how many volts is the power supply? Are the antennas matched?
If there is no problem with the above, please contact customer service
Around 50mA
moreNo, we don't provide specific chip models for the time being.
moreIt can.
moreYes, but we have a single-chip microcomputer inside the serial port module.
more