Intermec Janus 2010 Reference Manual page 96

im_irl_n
Data is returned only if its length matches one of the five lengths specified
in the test_table. The test_table parameter must be a matrix in this form:
{a, b, c, d},
{a, b, c, d},
{a, b, c, d},
{a, b, c, d},
{a, b, c, d},
The a position in the matrix is one of the following:
IM_NO_LENGTH Accept data of any length
IM_LENGTH
IM_RANGE
If IM_LENGTH is specified in the a position, the actual length of the data
string is placed in the d position (and b and c are not used).
If IM_RANGE is specified in the a position, the data length must be within
the range of b and c (and d is not used).
Set any unused table entries to {IM_NO_LENGTH,0,0,0}.
You must allocate at least 256 bytes to the irl_string parameter.
OUT Parameters:
The cmd_count returned is 0 unless an abort command is passed in the
string.
The symbology parameter is one of the following constants:
IM_UNKNOWN_DECODE
IM_CODABAR
IM_CODE_11
IM_CODE_16K
IM_CODE_39
IM_CODE_49
IM_CODE_93
IM_CODE_128
3-56
Accept data of a specific length
Accept data within a length range
Unknown bar code
Codebar bar code
Code 11 bar code
Code 16K bar code
Code 39 bar code
Code 93 bar code
Code 49 bar code
Code 128 bar code