Hardy HI 6500 Series - Manual (Page 54)

46 Chapter 4
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2. Enter the command #0 into data register #0.
3. Run the Modbus Function code #16 (write multiple registers).
4. Run the Modbus Function code #4 (read multiple registers).
5. Read the value for the span parameter in data registers #4 & 5. This value will be
in floating point format.
Example 2: If you wish to write a new span value of 100.55:
1. Enter the Span parameter ID into data registers 2 & 3. The Span ID is
0x0000 0201.
a. Place 0x0000 into data register #2.
b. Place 0x0201 into data register #3.
2. Enter the new value into data registers 4 & 5. The float value 100.55 in hex is
0x42C9 1999.
a. Place 0x42C9 into data register #4.
b. Place 0x1999 into data register #5.
3. Enter the write float command into data register #0. The write float command is
0x1001.
a. Place 0x1001 into data register #0.
4. Run the Modbus Function code #16 (write multiple registers).
5. Run the Modbus Function code #4 (read multiple registers). This will allow the
user to read the status of the command in data register #1.
If you wish to then read back the value you have written:
6. Enter the command #0 into data register #0.
7. Run the Modbus Function code #16 (write multiple registers), or Function code
#6 (write single register) insuring the correct data location is being set.
8. Run the Modbus Function code #4 (read multiple registers).
Read the value for the span parameter in data registers #4 & 5. This value will be in
floating point format.