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Sample Messages: Transactions from the monitor HL7 interface
MSA — Message segment acknowledgment
HL7 acknowledgment messages may contain one of statuses from the receiving
system:
Application Accept (AA)
Commit Accept (CA)
Application Error (AE)
Application Reject (AR)
If a positive accept acknowledgment (AA or CA) is returned from the HIS, it is
assumed the HIS has committed the data it received to safe storage. The
monitor HL7 application is then released from the necessity of re-sending the
message on time outs. If the acknowledgment configuration is enable, the
monitor HL7 application expects an accept acknowledgment message which
indicates successful reception and secure storage of the HL7 message data in
the HIS.
If the acknowledgment configuration is enabled, according to the HL7
specification, AE messages are those that contain an error. The outbound
interface attempts to send the ORU message again, with there being no more
than three total attempts; AR messages are also not retransmitted, the system
will disconnect the connection with the HL7 receiving system.
If the acknowledgment configuration is enabled, and no HL7 Acknowledgement
message is received after three total attempts. The outbound interface
disconnects the connection with the HL7 receiving system.
Regardless if the acknowledgement configuration is enable or disable, if monitor
receives an HL7 acknowledgement message with an Acknowledgment Code
(MSA field 1) that is not "AA" or "CA". The outbound interface creates a log entry
with at least the description from the message (MSA field 3) and error condition
(MSA field 6) if present.
Acknowledgment Message Examples
HL7 messages may be acknowledged as accepted, rejected, or returned with an
acknowledgment error. The following are examples of possible acknowledgment
messages that may be received as a result of sending messages to an HIS
server.
Acknowledgment Accept
MSH|^~\&|NUR^^|.^^|MMS
HL7|.^^|199812021001||ACK^R01|17f1be29-aa2a-11d2-
a655-00105a1e9b67|P^|2.3
MSA|AA|17f1be29-aa2a-11d2-a655-00105a1e9b67
Acknowledgment Reject
MSH|^~\&|NUR^^|.^^|MMS
HL7|.^^|199812021003||ACK^R01|17f1be29-aa2a-11d2-
a655-00105a1e9b67|P^|2.3
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