To indicate the start of a transaction set and to assign a control number
20
B1
Beginning Segment for Booking or Pick-up/Delivery
To transmit identifying numbers, dates, and other basic data relating to the transaction set
To transmit identifying information as specified by the Reference Identification Qualifier
To specify pertinent dates and times
To identify the equipment
To specify special charge code and the associated monetary amount
To specify information about a specific event
To transmit information in a free-form format for comment or special instruction
To specify stop-off detail reference numbers and stop reason
To transmit identifying information as specified by the Reference Identification Qualifier
To specify pertinent dates and times
To transmit information in a free-form format for comment or special instruction
To indicate the end of the transaction set and provide the count of the transmitted segments (including the beginning (ST) and ending (SE) segments)