1.  wire (D+,D-) of COM2 to (D1+,D1) of COM1
2.  JP1 select RS-485
3.  execute loadram2.exe (7188)
4.  keyin qc3.exe
5.  press ALT-S
6.  keyin qc3.exe (qc1.exe must in PC's current directory)
7.  wait download qc3.exe into RAM-DISK
8.  execute b:qc3.exe (7188)
9.  check COM1 send 55/AA to COM2 is OK ?
9.  check COM2 send 55/AA to COM1 is OK ?
11. press Q to stop qc1.exe