Instruction manual

A758 Owner’s Guide Chapter 7: Programming Guide
September 1999 194
txxxxxxxxxt cccc xxxxxxxxo
txxxxxxxxxt cccc-xxxxxxxxo
txxxxxxxxxt cccc xxxxxxxxo xx
If all of these searches fail to produce the distinct check serial number, and the
check serial number field has been specified in the parsing parameter string
options, no check serial number will be returned. If it is imbedded within the
account number field, it will be returned as part of that variable length field.
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:
txxxxxxxxxt ccc-xxxxxxxxxxoxxxx
txxxxxxxxxt xxx-xxxxxxxxxxocccc
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:
txxxxxxxxxt ccccxxxxxxxxxxo
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:
txxxxxxxxxt xxx-ccc-xxxxxxxxxxo
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:
0x1B 0x73 n1 n2 k
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.