zarobhr:
floresta:
Is jumper link J2 soldered or open?Don
it looks like it is open
OK - That means that pin 5 functions the same way as the Hitachi chip and to work correctly with the LiquidCrystal library it must be connected to GND.
It looks like pin 3 is a /Reset pin so you really should connect it to +5V, preferably via a pull-up resistor.
there are also other posts on the forum that i read where people are using the arduino library for the vfd. it is an lcd compatible vfd
Your results seem to indicate that the instruction set is the same as (or very similar to) the one for the HD44780 but at least some of the timing is not compatible. It would help if you could dig up a full data sheet.
Don