Chapter 02: Control
The rules every message obeys, whatever it is about.
How a message is put together: the header, the delimiters, how a receiver acknowledges what it was sent, and what to do when something is wrong. Nothing clinical happens here, but every other chapter depends on it.
What is in this chapter
- 12 segmentsthe lines these messages are built from, and the fields on each
- 17 code tablesthe value sets the fields in this chapter draw from
- 2 message typesACK, MCF
Message types defined here
ACKGeneral acknowledgment messageNamed by the standard without a structure of its own.
MCFDelayed Acknowledgment (Retained for backward compatibility only)Named by the standard without a structure of its own.
Segments defined here
These 12 segments are defined in chapter 02. Messages in other chapters may still carry them.
ADDaddendum segmentBHSbatch header segmentBTSbatch trailer segmentDSCcontinuation pointer segmentERRerror segmentFHSfile header segmentFTSfile trailer segmentMSAmessage acknowledgment segmentMSHmessage header segmentNTEnotes and comments segmentOVRoverride segmentSFTsoftware segment