Sun Microsystems Sun Adapter IP HL 7 - Manual (Page 17)

■ No response is received after a message is sent the maximum number of times.
Outbound Functionality
The outbound TCP/IP HL7 Adapter Project, prjHL7Outbound, can be implemented in
standard outbound mode or in two forward message modes: outbound delayed ACK or
outbound forwarder.
Outbound Adapter Data Flow
In outbound mode, the Adapter receives HL7 messages from a JMS queue. Each message is
verified to ensure it contains HL7 data only. Legitimate HL7 data is enveloped into its
configured format and sent to the external system.
A message in the JMS queue triggers the outbound Collaboration. The outbound Collaboration
is provided with an HL7 message to send to the external system
The Adapter waits for a configurable number of milliseconds for an incoming HL7 ACK or
NAK from the external system. After receiving an HL7 response from the external system, the
Adapter strips the message from its envelope and verifies its integrity.
Any non-HL7 acknowledgment received from the external system causes the Adapter to resend
the same message. If the incoming response is an HL7 ACK or NAK, the Adapter might do
either of the following, as dictated by its configuration:
■ Recourse action on NAK received.
■ Recourse action on Max NAK received.
If journaling is set, these messages and their ACKs are placed in the journal file.
Outbound Standard Messaging Mode
The following steps describe the process for the Outbound Standard Message Mode:
1. An HL7 message triggers the Collaboration. The outbound Collaboration is designed to
accept the HL7 messages.
2. The Collaboration maps the received message into the Generic Event Message Library and
validates the MSH segment. If validation is enabled, the Collaboration checks the MSH
segment of the outbound messages against MSH values configured in the Adapter
properties file. If the validation fails or the message cannot be parsed, the message and its
error are written to the error queue. Note that the HL7 message is always checked for
structural correctness.
3. The Collaboration sends the message to the RA.
4. The RA envelopes the message and sends it to the External System and waits for an ACK.
Sun Adapter for TCP/IP HL7 Overview
Sun Adapter for TCP/IP HL7 User's Guide 17