Hello Racheal:

Thanks for responding.

I have check the connections for the TTL setup and serial and they work fine when talking to a PC. I do have the grounds tie together.
After I send the massage this morning I thoug of something could it be a ground problem.
I have done some checking by ...

I purchase a LK204-25 and I am having a problem comunicationg from my controller to the display and viserbersa.

I can use the PC to talked to the LK204-25 and I can get the keypad signals. I can get my control ( TERN i386 Drive)to talked to the PC and send data back and forth.
But when I hook the ...