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ST Secure MICR Printer User’s Guide 11 2006, Source Technologies
March 2006 All Rights Reserved
MICR Line
Accurate high-speed processing of your checks by financial institutions is enabled
by the accuracy and integrity of the data in the MICR line. Refer to figure 3.1 for
the location of the following MICR line fields. The MICR line is read from right to
left with position one being the right most position proceeding to position sixty-five
on the left. The MICR line must be printed at exactly eight characters per inch.
Auxiliary On-Us Field Positions 65 to 45
This field usually contains the check serial number for commercial size checks
and possibly account control information. It is bounded by On-Us symbols. (;). It
is not included on personal, small size checks.
External Processing Code (EPC) Field Position 44
This one digit field is position 44 of the MICR line. This field is usually left blank.
The use of this field is reserved by the ABA and is controlled by the ASC X9B
Standards Committee.
Routing Field Positions 43 to 33
The routing field is bounded by Transit Symbols (:) in positions 43 and 33. It
contains fixed format information about the drawee institution. Consult with your
bank for the specific data field to be placed here for each of your accounts.
On-Us Field Positions 32 to 14
The On-Us field contains the makers’ account number. The structure and
content of this field is left to the drawee bank. On personal checks this field also
contains the check serial numbers. The On-Us field may not consist of more
than 19 characters. An On-Us (;) symbol must appear immediately to the right
of the account number.
Blank Field Position 13
Position 13 is always left blank.
Amount Field Positions 1 to 12
The amount field is the right most field in the MICR line. It remains blank until it
is printed by the bank of first deposit. When the check enters the banking
system, the bank of first deposit encodes this field from data in the convenience
amount field. It will be bounded by Amount Symbols (/).