AT$H9

Generic Communication Programs          AT &C1 &D2                                

Synchronous DTR Dial                    AT &F &C1 &D2 E0 Q1 &Q2 &W       

Synchronous Answer                      AT &F &C1 &D2 E0 Q1 &Q1 S0=1 &W  

AS400                                   AT &F &C1 &D2 E0 Q1 &Q1 S0=1 &W  

MNP Error-Control                       AT &F &C1 &D2 &Q8                   

V.42bis/MNP2-4 Error-Control            AT &F &C1 &D2 &Q9                   

                                                                                        

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