ABB Easiline EL3020.
I am working from the documentation here
It has analog and modbus output, Mark, but the analog output is more noisy than the modbus output, presumably due to lower prescision the the D to A converter. A colleague has been able to log modbus data (using Matlab, I think) for comparison.
I am progressing a little with the extraction of data from a 32-bit dummy string in IEEE574 format.
Along the way I have been rather surprised to find that IVAL does not work with long integers!
Thank you for your interest. It is helpful to be able to chat about this.