Well, another long day of work and still no progress. If anyone out there is familiar with I2C programming and C, I would appreciate some help with my problem. The file included has todays log as well as my current code. One, ACk_Continous.c gives an acknowledge but send more data than the routine calls for. I would greatly appreciate any help, Shawn Springer Attachment converted: wonderland:I2C.zip (pZIP/pZIP) (00018875)