IBM 4840-563 - Page 69

The data from the card is returned as shown in the following Baccus Naur Form:
Track data: <Track1><CR><Track2><CR><Track3><CR>
Track1: [<Start Sentinel 1><Data1>{1,82}<End Sentinel>]|[<Error>]
Track2: [<Start Sentinel 2><Data2>{1,40}<End Sentinel>]|[<Error>]
Track3: [<Start Sentinel 3><Data2>{1,107}<End Sentinel>]|[<Error>]
CR: 0x0D or Carriage Return
Start Sentinel 1: 0x25
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or value in configuration byte 2
Start Sentinel 2: 0x3B or value in configuration byte 3
Start Sentinel 3: 0x2B or value in configuration byte 4
End Sentinel: 0x3F or value in configuration byte 5
Error: 0x45
Data1:
0x21 to 0x5F
Data2: 0x31 to 0x3F
Data3: 0x31 to 0x3F
If a track is read incorrectly an ASCII ‘E’ is returned in place of the bad track. The following table shows the
format of the MSR configuration word:
Byte1 Configuration bits Factory Default
Bit Function PS/2 RS-232
0 CR enabled 1 0
1 Raw data mode 0 0
2 track 1 disabled 0 0
3 track 2 disabled 0 0
4 track 3 disabled 0 0
5 Strip Sentinels 0 0
6 Use Custom Configuration 0 0
7 Hide Error tracks 0 0
Byte 2 SS1 0x25 0x25
Byte 3 SS2 0x3B 0x3B
Byte 4 SS3 0x2B 0x2B
Byte 5 ES 0x3F 0x3F
Byte 1, Bit 0: Carriage return Enabled
This bit enables the inclusion of Carriage returns between the tracks. This defaults to ‘0’ or no Carriage
SurePOS 500 Model XX3 Technical Reference, v 1.3 Page 69 of
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ASCII conversion of characters used in this document are: 0x25=’%’, 0x3B=’;’, 0x2B=’+’, 0x3F=’?’, 0x45=’E’. For
more ASCII character conversions see ISO-646-US-ASCII.
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