Data record subtype 2: Event mark (record type 19)
The following table shows the additional records provided in Report Packet 57h when the Event Mark record is enabled with Command Packet 56h.
| 
                                     Subtype 2: Event Mark (Record 19)  | 
                            ||||
|---|---|---|---|---|
| 
                                     Byte  | 
                                
                                     Item  | 
                                
                                     Type  | 
                                
                                     Value  | 
                                
                                     Meaning  | 
                            
| 
                                     8  | 
                                
                                     Event Source  | 
                                
                                     1 (byte)  | 
                                
                                     00h–05h  | 
                                
                                     0: External Event  | 
                            
| 
                                     9  | 
                                
                                     Event Port  | 
                                
                                     1 (byte)  | 
                                
                                     00h–05h  | 
                                
                                     0: Not Applicable  | 
                            
| 
                                     10–11  | 
                                
                                     Event Number  | 
                                
                                     2 (short)  | 
                                
                                     
  | 
                                
                                     Event record tag number, incremented with each event  | 
                            
| 
                                     12–19  | 
                                
                                     GPS time  | 
                                
                                     8 (double)  | 
                                
                                     msec  | 
                                
                                     GPS time of week in milliseconds  | 
                            
| 
                                     ---------- End of Subtype 2 ----------  | 
                            ||||