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CAN-8123/CAN-8223/CAN-8423 user’s manual (Revision 3.00, May/22/2009) ------
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2.5.2 The ERR LED
The ERR LED relates to the state of missing messages at the CAN
physical layer (These missing messages might be SYNC or Guard messages).
The data state and the signal state description are respectively shown in the
following figure and table.