The checksum for the error correction is calculated according to modulo 43 over the entire code block. Codablock F Codablock F is based on Code 128 barcode, consists of 2 to a maximum of 44 lines, of 4 to 62 data character each and can encode up to 2,725 characters. Codablock F can encode full ISO 8859-1 8-bit charset. Codablock F start character always must be Start A(Code 128). Codablock 256 Codablock 256 has the same structure as Codablock F with the difference that each line has its own start character. Codablock 256, like Codablock F can encode a maximum of 2,725 characters. Additionally, each code line has its own error correction so small damage can be repaired. This version of Codablock was not standardized as international standard and left as internal Identcode Systeme GmbH development. Codablock F structure Codablock F consists from stacked Code 128 barcode lines and have the following features: has from 2 to 44 lines; each line has from 4 to 62 data characters; can encode up to 2,725 characters; can more effectively use rectangular space then any 1D barcode; can use any code 128 reading equipment with slight modification or even without it; when printing consists from standard Code 128 rows; secured by two mod-86 check sums in addition to the row check sums; can encode full ASCII character set. 8-bit character set is available using the ISO 8859-1 (Latin-1) character set (FNC4); numeric compression: allows to encode blocks of numbers (minimum 4) using only the half of the usual space; additionally, secured by a row checksum with modulo 103. Codablock F constructed from Code 128 data rows which are blocked between Start A (Code128) character and Code 128 Stop character. Every row has its number in second position after encoding mode selector or data character. The first row has rows count on the number place. The last row has two additional checksum characters. MDX - encoding mode selector or data character if data can be encode in Code A mode. Rows Count - count of rows in barcode, set in the first row. RX - row number. Row X Data - encode data in the code 128 row. CSX - Code 128 checksum. CBS1, CBS2 two Codablock F checksum characters. See also Automated identification and data capture (AIDC) Barcode Code 128 Code 39 Health Industry Business Communications Council(HIBC) References External links AIM ISS -