HD45 / HD46
- 57 -
V2.4
Command
Value
Length
Description
Function
:
10h
1 byte
Parameters write command
Data
: 00h
Address
of
1
st
parameter(MSB)
4Bh
2 bytes
Address of 1
st
parameter (LSB)
00h
Number of parameters to write (MSB)
02h
2 bytes
Number of parameters to write (LSB)
04h
1 byte
Number of bytes for the values
01h
Value at 0V or 4mA = 350 ppm (MSB)
5Eh
2 bytes
Value at 0V or 4mA = 350 ppm (LSB)
04h
Value at 10V or 20mA = 1200 ppm (MSB)
B0h
2 bytes
Value at 10V or 20mA = 1200 ppm (LSB)
The instrument will answer as follows:
Response
Value
Length
Description
Function
:
10h
1 byte
Parameters write command
Data
: 00h
Address
of
1
st
parameter (MSB)
4Bh
2 bytes
Address of 1
st
parameter (LSB)
00h
Number of parameters to write (MSB)
02h
2 bytes
Number of parameters to write (LSB)
For permanent storage of changes, transmit the command below:
Command
Value
Length
Description
Function
:
05h
1 byte
Commands execution
Data
:
0002h
2 bytes
Permanent storage command address
FF00h
2 bytes
Fixed value
At the end, parameters can be protected again from undesired alterations by sending
a different access code than the one stored in the internal memory.
Instrument error conditions
(function
07h
)
Function code 07h allows to read the 8-bit register containing information about any
error conditions that may occur.
Each register bit corresponds to an error condition:
•
Bit 0
: humidity module EEPROM doesn’t answer;
•
Bit 1
: humidity module EEPROM contains incorrect data;
•
Bit 2
: Relative humidity sensor calibration data not available;
•
Bit 3
: Calibration and configuration data memory is altered;
•
Bit 4
: Program memory altered;
•
Bit 5
: Temperature calibration error;
•
Bit 6
: Temperature measurement out of scale;
•
Bit 7
: Relative humidity measurement out of scale.
