For: RS-232

["Shang" <shangweiqing@xxxxxxx>]

                                 Standard RS-232 Interface Connection

1. Standard 25-pin Connection

               COM925)                                       MODEM(25)

                   2     ------------------------------------       2  
                        TD
                   3     ------------------------------------       3  
                        RD
                   4     ------------------------------------       4  
                       RTS 
                   5     ------------------------------------       5  
                       CTS
                   6     ------------------------------------       6  
                       DSR
                   7     ------------------------------------       7  
                        SG
                   8     ------------------------------------       8  
                        CD
                 20     ------------------------------------     20    
                     DTR

2. Standard 9-pin v.s. Standard 25-pin Connection

               COM(9)                                        MODEM(25)

                   1     ------------------------------------       8  
                        CD
                   2     ------------------------------------       3  
                        RD
                   3     ------------------------------------       2  
                        TD
                   4     ------------------------------------      20  
                      DTR 
                   5     ------------------------------------       7  
                        SG
                   6     ------------------------------------       6  
                       DSR
                   7     ------------------------------------       4  
                       RTS
                   8     ------------------------------------       5  
                       CTS
                   9     ------------------------------------     22   
                        RI