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MSH Segments |
The MSH segment is the MeSsage Header segment. Every HL7 message starts with an MSH segment. This segment contains the following information that's relevant to an ACK message:
| Location | Information | Description |
|---|---|---|
| MSH.3 - MSH.6 | Sending Application (MSH.3), Sending Facility (MSH.4), Receiving Application (MSH.5), Receiving Facility (MSH.6) | Indicates what application generated the message, and what facility generated the message. |
| MSH.10 | Message Control ID | Unique ID for the message being sent. This is used by the receiving system to distinguish between messages being sent to them. |
| MSH.12 | Version ID | Allows the sending system to indicate which version of the HL7 standard that their message complies with. |
For the inbound parsing of each message you want to acknowledge, it is important to store the message control ID and possibly other parameters like the sender, version, etc.