Page 23 Instruction manual Parker X-Flow FM-1407 Rev - 7/18
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Long integer parameters have a length of 4 bytes and are mapped on two consecutive Modbus®
registers. The first register contains bit 32-16, the second register contains bit 15-0.
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Floating point parameters have a length of 4 bytes and are mapped on two consecutive Modbus®
registers. Floats are in single precision IEEE format (1 sign bit, 8 bits exponent and 23 bits fraction).
The first register contains bit 32-16, the second register contains bit 15-0.
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String parameters can have a length of maximal 16 bytes and can take up to 8 Modbus® registers
where each register contains two characters (bytes). The upper byte of the first register contains the
first character of the string. When writing strings, the write action should always start from the first
register as a complete block (it is not possible to write a part of a string). If the string is shorter than
the specified maximum length the string should be terminated with a 0.
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