transmit.err

This is my code (with PIC 18F458) for Modbus RTU Network. I have written by Ccs laguage

>>> Warning 202 "transmit.c" Line 10(6,10): Variable never used:   conv
>>> Warning 202 "transmit.c" Line 51(8,9): Variable never used:   i
      Memory usage:   ROM=2%      RAM=3% - 3%
      0 Errors,  2 Warnings.