# ESB Interface Messages

The ESB Interface messages pertain to the operation of Substation ES ESB Interface that performs routing and transformations.

Substation ES subscribes to and publishes TIBCO Rendezvous and TIBCO Enterprise Message Service messages on behalf of CICS and IMS transaction processing applications, which execute on the z/OS system.

You specify connection details and data mappings that define how data is to be transformed from TIBCO messages to application buffers by the Substation ES Transformer. This section describes the Transformer and other messages that are displayed within the XFR interface.

ESB Interface Messages include the following types:

- Transformer Messages
- Transformer User Messages
- Configuration File Utility Messages
- Transformer Panel Error Messages

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