CDS Interchanges submitted or received must use the correct CDS Header and Trailer Controls to provide Interchange and Message addressing and identification.
Every CDS Interchange must consist of:
Multiple CDS messages are usually sent in a single CDS Interchange.
The CDS MESSAGE HEADER signifies the start of each CDS Message and contains control information for the Message.
|M||CDS MESSAGE TYPE|
|M||CDS MESSAGE VERSION NUMBER|
|M||CDS MESSAGE REFERENCE|