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Message Verication
Message verication begins with reading the message from the external system. The message is
expected to match the MLLP envelope, since both HLLP and MLLP envelopes have the Start of
Block (SOB), End of Data (EOD), and a Carriage Return (CR) in common.
If a message fails the read verication, it is considered bad data. If read by an inbound Adapter,
this failure causes the Adapter to generate a Canned HL7 NAK. An outbound Adapter ignores
the message and logs a warning, reporting the nature of the problem to the log le.
An HLLP envelope needs further verication as to whether it is data or a NAK, as well as the
Block Checksum and Block Size. The Adapter behaves as described above if the HLLP envelope
verication fails.
After stripping the message envelope, the RA hands the de-enveloped message to the inbound
Collaboration where it is parsed into the generic event Message Library. This ensures that the
general form and MSH segment are valid. If the MSH property is set, the Collaboration veries
that the elds specied in the HL7 segment section are the same as those of the received MSH,
otherwise, a NAK is returned.
Acknowledgment Processing
■
Adapter Generates HL7 Acknowledgment
In this scenario, the Adapter generates an HL7 ACK after receiving and successfully storing
the message in a queue; otherwise, it generates an HL7 NAK. The HL7 ACK or NAK is
placed in the proper envelope and sent to the external system.
■
ESB Sends HL7 Acknowledgement
In this scenario, the Adapter acts as a receiver in a Delayed ACK scenario, as described in
“Inbound Receiver Message Mode” on page 15.
■
Canned HL7 NAK
A canned HL7 NAK is created when a read error occurs or when an message cannot be
identied as an HL7 message. The initial test ensures that the message conforms to the
lower-layer protocol. The Resource Adapter uses the MSH section parameters to create an
appropriate NAK.
Recourse Actions
Recourse actions can be congured for an inbound Adapter for the following conditions. For
more information, see
“Recourse Actions” on page 21.
■
The empty read limit is reached.
■
The maximum number of NAKs are received by the Adapter.
■
The maximum number of NAKs are sent by the Adapter.
■
The maximum number of response timeouts is reached.
■
A NAK response is received.
Sun Adapter for TCP/IP HL7 Overview
Sun Adapter for TCP/IP HL7 User's Guide • October 200916
- Sun Adapter for TCP/IP HL7 1
- User's Guide 1
- 091015@23031 2
- Contents 3
- TCP/IP HL7 Features 9
- TCP/IP HL7 Adapter Components 9
- About HL7 10
- Generic HL7 Message Libraries 11
- Modes and Roles 12
- HL7 Adapter Sender Role 13
- HL7 Adapter Receiver Role 13
- Delayed ACK Mode 13
- Inbound Functionality 14
- Inbound Receiver Message Mode 15
- Message Verication 16
- Acknowledgment Processing 16
- Recourse Actions 16
- Outbound Functionality 17
- Outbound Delayed ACK Role 18
- Outbound Forwarder Role 18
- Failed Message Handling 21
- TCP/IP HL7 Adapter Operation 22
- Lower Layer Protocol 23
- HL7 Acknowledgment Level 23
- Journaling 23
- Monitoring the HL7 Adapter 24
- API for SchematronValidation 26
- Connectivity Map 27
- Name Description 31
- TCP/IP HL7 V2 Inbound Adapter 36
- Delay, and Period properties 37
- HL7 V2 Inbound Adapter 38
- Properties 49
- (Continued) 54
- Outbound Adapter 56
- TCP/IP HL7 V3 Inbound Adapter 68
- HL7 V3 Inbound Adapter 71
- Inbound Adapter 74
- To Create a Copy of a Project 98
- Export Manager 99
- Collaboration 104
- Select Object Type Denition 106
- About HL7 V3 120
- Mode of ACK Process) — Part 1 122
- Mode of ACK Process) — Part 2 125
- Continue 129
- Mode of ACK Process) — Part 3 132
- Continued 137
- LASTUPDATEDTIME TIMESTAMP) 143
- HL7 Query/Response 145
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