Hello, I am trying to monitor some holding registers on a KEP Supertroll 2 flow computer via modbus RTU RS-232. I have a DB9 to USB cable. I have followed as many of the troubleshooting steps that an can from the NI suggestions: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019L3mSAE&l=en-US I have confirmed that everything is connected properly I have confirmed the cable is working properly via the recommended serial loopback test I have run the shipping example with the same timeout result. I have completed an I/O trace (I will attached the results of the trace) Based on the results of the trace and that the flow computer is rather old I am skeptical that I need to implement a wait time between the read and write commands but I am not sure how to do so. I am using an almost identical code for a RS-485 device without any issues. Any help is appreciated! Thanks!

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Serial RS-232 Error: (0xbfff0015) Timeout Expired Before Operation Completed

Re: Serial RS-232 Error: (0xbfff0015) Timeout Expired Before Operation Completed

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‎04-06-2023 11:12 AM

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Hi A2KDM,

I have tried that too. I have tried the Chipkin free version. Picture below. It works with other devices but not this one for some reason. Any other sniffers you suggest (Free Versions)?