External Processing Code (Epc) Field; Auxiliary On-Us Field; Field Formats Summary - Xerox 6100BD - Phaser Color Laser Printer Fundamentals

Document design
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External processing code (EPC) field

The External Processing Code (EPC) field is an optional field
between the Transit and Auxiliary On-Us fields at position 44 or
45. When present, this field indicates that the document is
eligible for special processing.

Auxiliary On-Us field

The Auxiliary On-Us field is an optional field that is sometimes
used by the banks for additional processing information or high
value serial numbers. When it is present, it is the farthest left on
the check, between positions 45 or 46 through 65.
This field is not present on personal checks because of space
limitations. On business checks, it usually contains the check
serial number or accounting control information specific to that
account.

Field formats summary

The following table provides a summary of the MICR field
formats and character positions using the E13B font.
Generic MICR Fundamentals Guide