The ack.vmd is intended for creating custom ACK messages. In particular it contains the MSA (message acknowledgement) segment which is used to hold the ACK response data. It is intended for use when creating a custom ACK in the script of a From LLP component.

How to use the ack.vmd:

• Place the custom ACK code in the script of a From LLP component
• Parse the message using hl7.parse{}
• Create the reply using ack.vmd with hl7.message{}
• Fill in the required MSH and MSA fields for the ACK
• Send the ACK using ack.send()

See Custom ACK Example for for more information.