MLLP

HL7 v2 transport layer, message framing over TCP/IP.

Definition

MLLP surrounds each HL7 v2 message with a start-block character <VT> (0x0B) and an end block <FS><CR> (0x1C 0x0D). Because TCP provides no message boundaries, this framing lets the receiver detect where each message starts and ends within the byte stream.

Origin

Defined in the HL7 Transport Specification: MLLP, Release 1, published by Health Level Seven International (INM work group).

Example in context

<0x0B>MSH|^~\&|SENDER|...<0x0D>PID|...<0x0D><0x1C><0x0D>

Related terms

• MSA — acknowledgment segment returned inside an MLLP frame.