Don't read 4064 with HRF--the table says that one is 16-bit. Only use HRF on the 32-bit floating point registers. Also, these addresses are all "zero-based" instead of "one-based". Ignition's driver defaults to one-based. You probably need to change that in the device settings.
I also noticed in the manual that the log file, if you need it, must be read with function code 20. Ignition's native driver cannot do this. If you need it, you will need something else, like my alternate driver: