WattNode Modbus FAQ

Frequently Asked Questions

  • What is the largest positive number that a 32-bit floating point register can represent?
Internally, the WattNode use a 64 bit energy accumulator and then outputs that as a 32 bit IEEE-754 floating point number, which supports only six or seven decimal digits of resolution. See the last entry in the table BACnet and Modbus Energy Resolution #Output Resolution.