Magicard Rio User's Reference Manual page 21

ISO 7811-2 Magnetic Standards
When using ISO standard magnetic card reader the card data format as specified in 7811-2
must remain as specified. The card data format must not be interchanged between tracks, ie
encoding track 1 card data format on track 2, as this will result in the card reader not being
able to correctly identify the data format.
The Magicard Rio Mag magnetic encoder can accept any combination card data format. If
the card data format is changed, ie track 1 data encoded on track 2, the Magicard Rio Mag
will encode the data on track 2, but when read with a Standard IOS 7811-2 card reader this
data will not be decoded and displayed. To enable the non standard ISO card data to be
decoded, an appropriate card reader must be used to decode this data format.
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