MagTek Excella, MICR Check Reader99875310 - Manual (Page 46)

Excella MICR Check Reader
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2-On-Us Field
The On-Us field is variable, up to 19 characters (including symbols). Valid characters are digits, spaces, dashes,
and On-Us symbols. The On-Us field contains the account number and may also contain a serial number
(Check number) and/or a transaction code. Note that an On-Us symbol must always appear to the right of the
account number.
3-Amount Field
The Amount field is a 10-digit field bracketed by Amount symbols. The field is always zero-filled to the left.
4-Auxiliary On-Us Field
The Auxiliary On-Us field is variable, 4-10 digits, bracketed by two On-Us symbols. This field is not present
on personal checks. On business checks, this field contains the check serial number.