User Documentation

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7.1.2.2 Advanced Settings  Priority Control
By using Priority Control emergency requests can be treated with higher priority. This feature is
designed for requests that are sent to Modbus RTU/ASCII slaves. Since Modbus RTU/ASCII slaves
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the response before sending the next request. When requests stack up, the response time can suffer.
This can cause problems for certain critical requests that require an immediate response.
With priority control, you can specify that certain requests are sent to the front of the queue for more
immediate response times. Priority requests can be specified by
Specified Master (Master selection using IP address or serial port)
Specified TCP Port (Define a prioritized port number for Modbus TCP communication)
Specified Request (based on parameters slave ID, function code or data segments)
When the Modbus gateway identifies a priority request, the request will immediately be placed at the
front of the queue.
Advanced Settings  Priority Control  Specified Master