Tips ( very important ) :
TXD: the sender . usually expressed as its sender . the normal communication must be connected to another device RXD.
RXD: the receive side. generally expressed as the receiving end of their normal communication to another device connected to TXD.
When normal communication TXD never received their equipment RXD!
Collected spontaneously : normal communication other devices connected RXD TXD. so if you want to receive data sent their name suggests. it is their own transmitted data received . which is connected directly to its own TXD RXD. used to send and receive the test itself is normal. is the quickest and easiest way to test if a problem occurs first do the test to determine whether a product failure. Also known as the loopback test .
Level logic :
TTL level : typically binary data representation . provides +5 V equivalent to the logic \"1\". 0V is equivalent to logic \"0\" . is called a TTL signal system is the positive logic
RS232 level : the -12V to -3V. equivalent to logic \"0\". +3 V to +12 V logic level is equivalent to logic \"1\" . the negative logic
Product description :
1. the main chip CP2102. generate a virtual serial port after installing the driver
2. USB to take power . leads to the interface includes 3.3V(\u003c40mA).5V. GND. TX. RX. the signal pin level is 3.3V. positive logic
3. onboard status indicator lights transceiver . install the correct drivers status indicator lit. when the communication transceiver indicator flashes . the higher the intensity . the lower the baud rate
4. support from 300bps ~ 1Mbps baud rate between
5. the communication format support: 1 ) 5.6.7.8 data bits ; 2 ) support 1.5. 2 stop bits ; 3) odd. even. mark. space. none parity
6 .support for the operating system : windows vista / xp / server 2003/200. Mac OS-X/OS-9. Linux
7. USB head for the male . can be directly connected to the computer USB port
8. SMT chip components for the production process . quality and stability
9. does not have USB head volume : (mm)

Buy this product includes the following accessories:
A welding test a good module

NOTE: The USB to serial port can be used STC-ISPV3.94 above download old versions STC microcontroller that STC89C (LE) and STC12C (LE) Series ( new version of the chip may not be able to download. there are users of the software on the highest and lowest Potter rate is set to the same time to download. we can not guarantee to do this at your own discretion ) (STC-ISP Download \u003c copy into your browser address bar \u003e :www.mcu-memory.com/datasheet/stc/STC-ISP-V4.83/STC-ISP-V4.83-NOT-SETUP-CHINESE.EXE. After downloading unzip ) Please see that this is not driving !
Download STC microcontroller steps:TXD connected microcontroller RXD. RXD connected MCU TXD. GND connected to GND. 5V connected to VCC. points to download the software . and then provide the above said four feet into the microcontroller .( Note: The MCU must have basic working conditions. including power. reset and clock ! While MCU TXD. RXD not followed by other peripheral devices. including the MAX232 and do not pick . otherwise it will lead to Download failed ! ! In the meantime . please do not disconnect the module from the computer ! )