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01 — Read Coils
02 — Read Discrete Inputs
03 — Read Holding Registers
04 — Read Input Registers
05 — Write Single Coil
06 — Write Single Register
15 — Write Multiple Coils
16 — Write Multiple Registers
01 03 00 00 00 0A C5 CD
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MODBUS over Serial Line Specification and Implementation Guide V1.02 — CRC generation
MODBUS Application Protocol Specification V1.1b3 — exception responses