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Source Technologies, LLC ST9630 Secure MICR Printer User’s Guide
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Reserve District and drawee institution. Consult with your bank for the proper
routing number and format for each of your accounts.
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 and is controlled by the ASC X9AB
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 .
MICR Check Design | 3