Message Formatting Selections (Only For Security Level 1 & 2) - IDTECH SecureHead User Manual

4.7. Message Formatting Selections (Only for Security Level 1 & 2)
4.1.5. Terminator Setting
Terminator characters are used to end a string of data in some applications.
<STX><S><21h><01h><Terminator Settings><ETX><CheckSum>
<Terminator Settings>: Any one character, 00h is none; default is CR (0Dh).
4.1.6. Preamble Setting
Characters can be added to the beginning of a string of data. These can be special characters for
identifying a specific reading station, to format a message header expected by the receiving host, or
any other character string. Up to fifteen ASCII characters can be defined.
<STX><S><D2h><Len><Preamble><ETX><CheckSum>
Where:
<Len>= the number of bytes of preamble string
<Preamble> = {string length}{string}
NOTE: String length is one byte, maximum fifteen <0Fh>.
4.1.7. Postamble Setting
The postamble serves the same purpose as the preamble, except it is added to the end of the data string,
after any terminator characters.
<STX><S><D3h><Len><Postamble><ETX><CheckSum>
Where:
<Len> = the number of bytes of postamble string
<Postamble> = {string length}{string}
NOTE: String length is one byte, maximum fifteen <0Fh>.
4.1.8. Track n Prefix Setting
Characters can be added to the beginning of a track data. These can be special characters to identify the
specific track to the receiving host, or any other character string. Up to six ASCII characters can be
defined.
<STX><S><n><Len><Prefix><ETX><CheckSum>
Where:
<n> = 34h for track 1; 35h for track 2 and 36h for track 3
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SecureHead SPI Interface with FPC User Manual
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