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Why won't my M340 READ_VAR communicate from my BMXNOM0200 to a 3rd party device?

This is often due to either cabling between the two or a communication parameter mismatch. Once the READ_VAR and NOM port are configured with the proper slave parameter information try the following. Set the native serial port on the CPU to match the configuration of the 3rd party slave device. Move the cabling from the device to the native serial port. This should work. If it does, the problem more than likely lies within the communication parameters that were provided for the Slave device not being accurate. If it does not work to the native port, the configuration of the block and/or cable are suspect. There are knowledge articles available for various pin outs and READ_VAR configurations.

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