MagTek EC500 99875172 - Manual (Page 43)

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ISO 7811 magnetic encoding standards
Track # Separator Density Character set Number of characters
Track 1 ^ 210 ppp 1 Alphanumeric(ASCII 20-95) 2 79 3
Track 2 = 75 ppp 1 Numeric(ASCII 48-62) 2 40 3
Track 3 = 210 ppp 1 Numeric(ASCII 78-62) 2 107 3
1 bits per inch
2 Except for the “?“ character
3 Including the start, stop and LRC characters which are automatically handled by the magnetic encoder.