The products are widely used in radio modification, cell phones Brush, XBOX360 Brush, GPS, vehicle inspection, DVD Brush, hard disk repair, set-top box upgrades.  

Can be used to program the microcontroller type:  

STC microcontroller  

STM32 MCU 

 NXP microcontroller  

Renesas MCU  

NEC MCU  

Communications chip: Domestic MAX3232  

Operating voltage: 3.3V-5.5V  

Interface: TX RX VCC GND 

Note: Domestic max3232 chip chip, there are some buyers purchase found no compatibility problems, please confirm before buyers to purchase the chip compatible with your system, to avoid buying the wrong, thank you! 

Buyer issue summary (we will buyers case problems are listed after the purchase, the buyer for future reference, we believe that the case of failure is greater than the benefits of successful cases buyers): 

A Lenovo notebook + Serial small plate (max3232) + usb to serial cable (340 drivers) Download stc89c52 not use; Lenovo desktop + Serial small plates (max3232) + usb to serial cable (340 drivers) 

Download stc89c52 normal use; max3232 chip will replace max232 Lenovo laptop + Serial small plates (max232) + usb to serial cable (340 drivers) can normally download download stc89c52 

Initially concluded: After max3232 through usb to serial cable, may have incompatibilities with certain notebooks. Buyers encountered a similar situation, you can select the appropriate serial chip based on the above test results. 

2 Samsung 2440 development board + max3232 small plate Operating voltage 3.3v serial communications found is not normal, the voltage rises to 3.8v will work properly.