User's Manual

Page 98 IQ Radar 300 PL-611
Appendix III
Appendix III Appendix III
Appendix III
Writing Parameters
Complete the following to set parameters through Modbus:
1. Send the parameter, its primary index, and its secondary index (usually 0) to
registers 40,090, 40,091, and 40,092.
2. Write the value to registers 40,096 and 40,097.
3. Write the desired format word to register 40,093 to enable the IQ-300 to interpret
the value correctly.
Format Register
Bits Values Description
1-8 0-2 Error Code
9-11 0-7 3-bit number representing decimal offset
12 0/1 direction of offset (0 = right, 1 = left)
13 0/1 Numeric format: Fixed (0) or Float (1)
14 0/1 Read or Write of data, Read (0), Write (1)
15 0/1
Word order: Most Significant Word first (0), Least Significant
Word first (1)
16 Reserved
For example, to format the level reading so that it is shown in percent with two decimal
places shifted left, the format bits would look like this:
Bit Numbers 16151413121110090807060504030201
Bit Values 0000001000000000
reserved
most significant first
read
fixed format
offset direction to right
decimal offset of 2
no error code
The value sent to the IQ 300 is 0000001000000000 binary or 4608 decimal. The value 4608
46084608
4608
is sent as an integer to register 40,093 to format the output words 40,094 and 40,095
accordingly.