Information byte:
This byte has meaning only when the Valid bit is set to 0 and indicates the difference between the transfer length or assigned length specified with a command and the actual data length required by the scanner. The value entered here is calculated using the following formula.
Information byte = transfer length - actual data length (assigned length)
(The data byte length is 0 when a negative value is specified.)
Sense keys:
The Initiator can determine the causes of scanner errors by monitoring the sense keys.