AT$H4

I0     Product Identifier                                                                                              

I1     Display ROM Checksum                                                                                            

I2     ROM Checksum Test                                                                                               

I3     Firmware Revision                                                                                               

I4     Product Features                                                                                                

I6     Identify Signal Converter                                                                                       

I7     Version Number                                                                                                  

&T0 Terminate Test In Process                                                                                       

&T1 Initiate Local Analog Loopback                                                                                  

&T3 Perform Local Digital Loopback                                                                                  

&T4 Enable Granting Of RDL Requests                                                                                 

&T5 Deny Granting Of RDL Requests                                                                                   

&T6 Initiate Remote Digital Loopback                                                                                

&T7 Initiate RDL With Self Test                                                                                     

&T8 Local Loopback With Self Test                                                                                   

&T19Perform RTS/CTS Cable Test                                                                                      

                                                                                                                       
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