Sorry about my previous reply.I make an txt,instead of simple message.So I rewrite the previous with some adnotations. I have buid the LC Meter.It works fine.I use the same hex that Kiriakos has mentioned.Also I use an 2x16 display because I did not have an 1x16[is HD44780 type]. All characters are displayed,even they are now separated on two lines. The PCB is good,only in schematics are some minor mistakes. I think the problem is,if the MCU was right written,in some bad conection between MCU and LCD display.You have to respect the PCB . Also you can contact Fenard,is open to consulting. The values for oscillator are 400 pF and 49 uH. I also do not use RS485 on PCB[ no conection between MCU and RS485].Fenard wrote to me and advise for this. The working of LM311 oscillator is ease to detect by an oscilloscope,or an rf voltmeter[even on DC scale of DVM you can see at the output of LM the variyng voltage]