Sell 1PCS PL2303HX USB to TTL Cable Module 4p 4 pin RS232 Converter USB to Serial Download Brush Line best price

Special Note: (1) This connection is only for selling one brush line and one tool. We are not familiar with how to use it, so we cannot provide instructions for operation. Because there are many models on the market, and everyone's hands-on ability is very different, so we can't guarantee you can succeed. Don’t even give us middle or bad reviews because we didn’t succeed, then we will complain more than Dou E! (2) Every one we send out is tested. Here we remind buyers not to operate directly after getting it, so as not to think it will be a problem. To do a simple test, the method is very simple: if you plug the cable into the computer, the computer prompts "found new hardware...", connect with a multimeter black pen (GND), red pen to connect (RX) and ( TX) can measure the voltage, it means that the small board must be good. In particular, if you connect (GND) to the voltage pins of the device, the power must be burned, so the user must accurately measure the pins of the device before wiring to avoid unnecessary losses! Some buyers accidentally burned the chip or will not operate or the machine itself does not support upgrades. It is said that there is a problem with our small board, etc. Please ask such buyers to bypass, thank you. In such cases, no return or refund will be given, and no middle or negative reviews will be accepted. Note: When setting 3.3V and 5.0V output (this is for the power supply of the microcontroller, the upgrade machine is not needed), please pull out the small board from the computer, set the jumper, do not operate with electricity, so as not to damage the device. Pin connection and description: Please be sure to find the pin definition before connecting, especially GND must not be connected to the voltage pin, and the RX and TX terminals should not be connected to the VCC pin, (the actual measured some VCC pin voltage is as high as 14V.) wrong connection The adapter chip must be burned, please be careful not to experiment with your own small board, otherwise we will not be responsible for burnout. Be sure to find a good pin definition. Connection method: Again, only 3 wires are needed for flashing. Generally, only three signal wires of RX TX GND are used, and VCC does not need to be connected. The above are friends with 4 and 5 pins, no need to connect VCC and BT pins. When using, please connect RXD to the target board TX, TXD to the target board RX, GND to GND, if not, swap RX and TX. All modules are double tested and leave the factory!