Hardy HI 4050, User Manual

Page: 132 / 192

124 Chapter 6
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byte 0: The least significant byte of the PARAMTER ID
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byte 1: The next byte of the PARAMTER ID but with the highest order bit set.
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bytes 2,3: The value you want to set the parameter to.
For example, to set the value of NumAverages to 3, if the first two-bytes are set to 0, send
this hex command <0x8007><0x0003>.
Here the <0x0007> is the lowest 2 bytes of the PARAMETER ID or NumAverages which
becomes 0x8007 after you set the most significant bit and <0x0003> is the value you want
to set the parameter to.
If the parameter is 4 bytes long, as all floating-point values are, you must first set the upper
2 bytes. A special PARAMETER VALUE (0x4000 or 0xC000 with the upper bit set) does
this. Also if the upper two bytes of the PARAMTER ID are not zero, use the special
parameter ID (0x4001 or 0xC001 with the upper bit set) to set the upper bytes.
All write commands are 1-shots
The first two bytes of the response to a write command are an echo of the first two bytes of
the command. The next two bytes are either the TWO MOST SIGNIFICANT bytes of the
parameter or, if the parameter was in fact a command like ZERO or TARE, a status code
indicating whether the command succeeded or failed.
If the PARAMETER ID is not valid, the instrument will return four zero bytes.
A parameter writing example: Setting Setpoint 2 Target to 1.0
Setpoint 2 Target has a PARAMTER ID of 0x00010012 (hexadecimal). The number 1.0 in
float format is 0x3F800000.
Step 1. Set the upper two bytes of the parameter value with the command
<0xC000><0x3F80>
Step 2. Set the upper two bytes of the PARAMETER ID with the command
<0xC001><0x0001>
Step 3. Write the Setpoint 2 Target with the command <0x8012><0x0000>
Performing a Parameter List (Dump)
Step 1. Select Operation on the Home Page
to open the Operation menu.
Step 2. Select Diagnostics to open the
Diagnostics Page.