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Rev. G
2. Click the Store Changes button when done. You must then click the Commit
All Changes button in the left menu towards the bottom for the change to
take effect.
Section 8.5: OMF
OMF Theory of Operations:
OMF (OSIsoft® Message Format) is a data transfer protocol developed to allow
individual devices to send data to the PI Server directly without the need for an
intermediary Interface or Connector device. In this protocol, Asset Frameworks (AF)
elements and Pi Archive tags are created by mCore in the first message alleviating the
need for exhaustive creation before the device connects. OMF is a “one-way” protocol
that does not have any capability to send data back from the Pi Server to the end device.
OMF uses ONLY an OUTBOUND SOCKET connection that is usually SSL/TLS encrypted.
With a maximum message size of 192kB, it is a very efficient protocol for transmitting
large volumes of data over an Ethernet network.
mCore’s implementation of OMF adds features that drastically increase the efficiency of
the protocol and improve data fidelity. To increase data efficiency, mCore offers
“Exception reporting” which means that each data block is adjustable as to how it
transmits and how often each parameter is checked for exception. The second major
feature is data buffering to prevent packet loss. When a parameter is judged to have
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