Cameron LEFM 200 - Page 42

IB0147 Rev. 08 LEFM 200 Modbus User Manual
Section 5 Page 38 December 2010
TX message: 02 04 00 C8 00 04 70 04
02 (hex) = Slave ID 2
04 (hex) = Function Code 4, Input Registers
00 C8 (hex) = 00 (hex) * 256 + C8 (hex) = 0 (dec) * 256 + 200 (dec) = 200 (dec) = Starting
Address 200
00 04 (hex) = 00 (hex) * 256 + 04 (hex) = 0 (dec) * 256 + 4 (dec) = 4 (dec) = Request 4
Registers (Words)
70 04 (hex) = CRC16 checksum
Rx message: 02 04 08 00 0E 00 13 00 16 00 0F E0 8A
02 (hex) = Slave ID 2
04 (hex) = Function Code 4, Input Registers, no error code
08 (hex) = 8 bytes to follow
00 0E (hex) = 00 (hex) * 256 + 0E (hex) = 0 (dec) + 14 (dec) = 14; SNR_UP1 (IR 200) = 14
00 13 (hex) = 00 (hex) * 256 + 13 (hex) = 0 (dec) + 19 (dec) = 19; SNR_UP2 (IR 201) = 19
00 16 (hex) = 00 (hex) * 256 + 16 (hex) = 0 (dec) + 22 (dec) = 22; SNR_UP3 (IR 202) = 22
00 0F (hex) = 00 (hex) * 256 + 0F (hex) = 0 (dec) + 15 (dec) = 15; SNR_UP4 (IR 203) = 15
E0 8A (hex) = CRC16 checksum