Sita Data Format - Access ATB420 Series Service Manual

Access keyboards ATB 420/421 Multi-Function Keyboard Product Specification and Service Guide
5.4

SITA Data Format

In SITA format, RS232 serial data to and from the ATB420/421 is transmitted in the form of blocks
with the following generalised format.
<SODn><STX> ..up to 1024 bytes of data..<ETX><EODn>
Where <SODn> is a Start Delimiter and <EODn> is the corresponding End Delimiter.
MNEMONIC HEX VALUE
STX 02
ETX 03
SOD1 0E
EOD1 0F
SOD2 1C
EOD2 1D
SOD3 1E
EOD3 1F
CR 0D
ESC 1B
5.4.1 MSR Data Format
When the ATB420/421 formats data read from MSR is the following data structure is used
<SOD1><STX>[DOC-ID]
[T/B] magnetic data<CR>
[T/B] magnetic data<CR>
[T/B] magnetic data<CR>
.....
[T/B] magnetic data<CR>
[T/B] magnetic data<ETX><EOD1>
MNEMONIC ASCII
DOC-ID A or
C
T/B
Note:
The range for TRACK/BLOCK NUMBER is from 11 Hex to 43 Hex
The TRACK/BLOCK NUMBER identifier is only included in the message if the block has been
detected. For example, when reading a ATB stub with tracks 1 and 3 read, the data string will be:
<SOD1><STX>A 013H Data....<CR> 033H Data <ETX><EOD1>
If the Magnetic Swipe Reader detects errors in the data, it will send a zero length data block.
Block numbers for a credit card are set to 1. No <CR> is sent after the last reported block.
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DESCRIPTION
START OF TEXT. This character signals the START of BLOCK
END OF TEXT. This character signals the END of a
BLOCK
Start delimiter for Mag Swipe Reader
End delimiter for Mag Swipe Reader
Start delimiter for Optical Character Reader (OCR) devices
End delimiter for Optical Character Reader (OCR) devices
Start delimiter for Bar Code Reader Device
End delimiter for Bar Code Reader Device
Carriage Return
Escape
HEX VALUE DESCRIPTION
41 or An ATB document read
43 A credit card read
11 to 13, TRACK/BLOCK NUMBER
21 to 23 (First digit is Track number and second is block
31 to 33 number)
41 to 43
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