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7-144 Chapter 7: Programming Guide

Exception Table Entry Format

Each exception table entry consists of five words. The first two words

contain the first eight characters of the transit number by packing the

low order nibble of the numeric transit number characters. For

Canadian checks, eliminate the dash and store the eight numerics.

The next three words are used as six individual bytes to tell the

firmware how to interpret the MICR characters that fall to the right of

the rightmost transit symbol. Each of the six bytes is positional and

consists of two parts: character type and number.

The three high order bits of each byte mark the character type. The

characters can be marked in three ways: check serial # character,

account # character, or “skip this character or symbol.”

The five low order bits of each byte contain the number of characters of

that type to extract. Most exceptions will not need to use all six bytes;

in that case clear the unused bytes to zero.

Bits within Byte

7 6 5 4 3 2 1 0

check serial # character string 0 0 1 n n n n n

account # character string 0 1 0 n n n n n

character string to ignore 1 0 0 n n n n n

Example 1

t123456780t12349876543210o 1234 is the check serial #

9876543210 is the account #

To load the second table entry, which starts at word 25, the transit

number 123456780 would be stored in the first two words of its table

entry using this string of commands:

0x1B 0x73 0x12 0x34 25

0x1B 0x73 0x56 0x78 26

After the right transit symbol are immediately the four characters of

the check serial #, followed immediately by the ten characters of the

account number. These would be bitwise encoded as:

1 2 ... 267 268 269 270 271 272 273 274 275 276 277 ... 313 314

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Axiohm 7156 Spezifikationen Seite 272