The Ncr4X20Vfd library accounts for special timing situations that occur in the time after the VFD has powered up. However, it assumes that the VFD is powered up at the same time or before the library is initialized. If for some reason the display is powered up after library initialization, call this method after display power-up to avoid problems communicating with the display.
vfd: a variable of the type Ncr4X20Vfd.
See UnitTests example.