Provided that you have setted the baud rate to 2400 than the error you have made is the use of inverted instead of true state. (very likely you have thought that N was standing for no parity)
Just change your code as for the below example and your lcd will work fine.


Code:
serout SER,T2400,[I,CLR] 'clear and move to home position
serout SER,T2400,[I,L1_C7,"mSEC"]' Print on the first line
serout SER,T2400,[I,LINE2] 'Redirect to second line
Serout SER,T2400,[#NV,"  "] 'Print Value of NV
Al.