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12 HL7 standard protocols Welch Allyn Connectivity Server

HL7 low-level protocol

This section describes the low-level format of HL7 packet frames.

Packet frames

HL7 frames that are exchanged between the server and the client describe both sent and

received data.

HL7 segment-level protocols

This section describes HL7 message hierarchy and delimiters, segment notation and

date/time format.

Message hierarchy and message delimiters

Segment notation

Table 5. HL7 packet frame: low-level format

Packet description Content Size (bytes)

Start block 0x0B ASCII <VT> 1

Body variable bytes variable

End block 0x1C ASCII <FS> 1

Carriage return 0x0D ASCII <CR> 1

Group

Groups

Segments

|Fields|

&components&

^subcomponents^

Table 6. HL7 segment notation: mandatory, optional and repeating

Notation example Definition

PID This segment is mandatory.

[PID] This segment is optional.

{IN1} This segment is mandatory, and it can repeat.

[{NK1}] This segment is both optional and repeating.

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