I have been unable to find a definitive answer in the documentation–am I correct in saying Ignition must act as the master in a Modbus configuration?
Correct, base Ignition only supports connecting as a Master modbus device.
However, some third party modules, like Automation Professional's Advanced Modbus Driver, allow you to configure Ignition as a Modbus server device or a Modbus Master device, while also adding additional helpful functionality.
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I’ve also got a Modbus server driver and it’s free / open source.
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Awesome, is there a download link available anywhere?
Missed that one for the free modules wiki, fixed now.
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