Milltronics ACCUMASS BW500, Instruction Manual

Page: 131 / 141

PL-565 Accumass BW500 Page 131
Communic
a
tions
Parameter Values
Bit Mapped
Bits are packed into registers in groups of 16 bits (1 word). In this manual we number
the bits from 1 to 16, with bit 1 being the least significant bit and bit 16 referring to the
most significant bit.
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
MSB LSB
32 Bit
Large numbers are put into unsigned 32 bit integers with a fixed decimal place of
three. For example, a value of ‘7345’ represents a value in the BW500 ‘7.345’. The
default word order is that the first word is the most significant word (MSW) and the
second word (register) is the least significant word (LSW).
For example, if we read R41,431 as a 32-bit, the 32 bits would look like the following:
R41,431 R41,432
16 MSB 1 16 LSB 1
32 32-bit integer value (UINT32) 1
The whole is read as a 32-bit integer.
The most significant byte (MSB) and least significant byte (LSB) can be reversed to
accommodate some Modbus drivers. See Format Word for BW-500 on page 125 for
details.
Text Messages
If a Milltronics device parameter returns a text message, that message is converted
to a number and provided in the register. The numbers are shown in the table below:
Number Text Message as displayed on LCD
22222 invalid value
30000 off
30001 on
30002
≡ ≡ ≡ ≡
30003 (parameter does not exist)
30004 err
30005 err1
30006 open
30007 shrt