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2.25.3 Sequence number: initial message

The sender initiates the link with a message that has no functional content. The sequence number is 0. The message type and event code are not used.

MSH|^~\&|ADT|767543|LAB|767543|199003141304-0500||^|XX3657|P|2.1|0<CR>

The responder uses a general acknowledgment. The expected sequence number is 1.

MSH|^~\&|LAB|767543|ADT|767543|199003141304-0500||ACK^|ZZ9380|P|2.1<CR>
MSA|AA|XX3657||1<CR>

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