Xylem H-3553 - Manual (Page 34)

MODBUS OPERATION
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Example #2: Write Multiple Registers Command:
Format: “aabbccccddddeeffffgggg”
Where: aa = 1 byte Modbus address
bb = 1 byte function code
cccc = 2 byte start address
dddd = 2 byte quantity of registers
ee = byte count
ffff = 2 byte data value
gggg = 2 byte crc value
Example:
011000010001022000BE41