+------------------------------------------------- STX
| +----------------------------------------------- Device Type
| | +--------------------------------------------- Transmit number
| | |               +----------------------------- Terminal ID
| | |               |     +----------------------- Diagnostics
| | |               |     |     +----------------- Date
| | |               |     |     |     +----------- Time
| | |               |     |     |     |+---------- Message type
| | |               |     |     |     ||+--------- Message Subtyoe
| | |               |     |     |     ||| +------- Transaction code
| | |               |     |     |     ||| |+------ Processing flag 1
| | |               |     |     |     ||| ||+----- Processing flag 2
| | |               |     |     |     ||| |||+---- Processing flag 3
| | |               |     |     |     ||| ||||  +- Response Code
| | |               |     |     |     ||| ||||  |
|_|_|_______________|_____|_____|_____|||_||||__|
SddttiiiiiiiiiiiiiiiiddddddyymmddhhmmssTSTT123RRR
----*----1----*----2----*----3----*----4----*----

Total length of header (including STX) = 49 bytes.
