NCR 7167 Owner's Manual page 220

7167 Owner's Manual
Exceptions
Some banks print the check serial number in a location that cannot be electronically
distinguished without specific exception information, although it can be visually
distinguished because it is repeated in the upper right corner of the check. For these cases,
the printer can hold up to nine exceptions for specific banks in its non-volatile memory
(NVRAM), which is accessed by the read and write NVRAM commands. The specific bank
is picked out by its transit number, and the firmware will look in the exception table for a
transit number match before looking in the normal check serial number locations.
In this example, without an exception table entry, the firmware would always pick the
rightmost four-digit number as the check serial number following rule two above. The
bank with the three digit check serial number and the four digit extension after the "on
us" symbol would need to be exceptionally recognized:
In this example, without an exception table entry, the firmware would not be able to pick
out the check serial number because it is not separated from the rest of the account
number:
In this example, without an exception table entry, the firmware would not be able to pick
out the check serial number correctly, because it is imbedded within the rest of the account
number:
Loading the Exception Table
The exception table begins at word 20 in NVRAM. Each entry takes five words. There is
room for eight exceptions with a sumcheck written in the last word. An application can
load local exceptions into the printer using the write NVRAM command:
which writes the two byte word n1:n2 to word k in NVRAM.
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.
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txxxxxxxxxt ccc-xxxxxxxxxxoxxxx
txxxxxxxxxt xxx-xxxxxxxxxxocccc
txxxxxxxxxt ccccxxxxxxxxxxo
txxxxxxxxxt xxx-ccc-xxxxxxxxxxo
0x1B 0x73 n1 n2 k
November 2002
Chapter 6: Commands