Axiohm 7156 Especificaciones descargar pdf (Pagina 140)

Commands 7156 Owner’s Guide

October 1995132

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 which 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

1 2 ... 135 136 137 138 139 140 141 142 143 144 145 ... 189 190

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Axiohm 7156 Especificaciones Pagina 140