Hardy HI 6300 Series - Manual (Page 42)

34 Chapter 4
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• TooHigh -1 : value is above legal limit
• TooLow -2 : value is below legal limit
• ErrorNotFound 0x8000 : parameter id not found
All communications will be controlled by the Modbus functions. The Modbus
protocol will determine the function, address, size, and offset register for the
message. The command interface data will be within the data portion of the
message and will define the command to our unit.
Example 1: If you wish to read the span weight value you would:
1. Enter the Span parameter ID into 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 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.