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

 (STC-ISP Download \\\\\\\\u003c copy into your browser address bar \\\\\\\\u003e :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 !