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UF3300 Modbus
The following word size types are used in the ensuing discussion:
uint16
int16
Table 2 - 16-bit Types
In addition to this, two consecutive registers may be used in
conjunction to represent larger types. The following 32-bit quantities are
supported:
uint32
int32
IEEE 754 SP
Table 3- 32-bit Types
Note that as with big endian format the most significant word is found in
the lower address as depicted in Figure 24. To illustrate this, the 32-bit,
unsigned value 0xA9871023 will be stored with the value 0xA987 in the
lower address (offset) and the value 0x1023 will be stored in the higher
address (offset). The same applies to an IEEE754 SP number. The
sign, exponent and 7 most significant mantissa values are stored in the
lower address. The lower precision 16-bits of the mantissa are stored in
the higher address.
Some registers below contain bit-mappings. These values may be
manipulated via the MASK WRITE REGISTER (command 22) as
outlined in Table 1. Bit fields are numbered from zero starting with the
first definition within the register. The number after the colon represents
the number of bits in this field.
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An unsigned 16-bit value
A signed, 2's complement 16-bit value
An unsigned 32-bit value
A signed, 2's complement 32-bit value
An IEEE754, single precision, 32-bit floating point
number
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