HD45 / HD46
- 52 -
V2.4
Example:
You may want to read the relative humidity measurement of a transmitter whose
current measure is 65.8%.
From Table 8.D we obtain that the relative humidity value is stored in register number
0003. In order to read the quantity value, you need to include in the request:
•
address (= number - 1) of register with the first parameter (0002 = 0002h)
•
number of parameters to be read (1 = 0001h).
Consequently, the command assumes the following format:
Command
Value
Length
Description
Function
:
04h
1 byte
Measurements reading command
Data
:
00h
First quantity address (MSB)
02h
2 bytes
First quantity address (LSB)
00h
Number of quantities to be read (MSB)
01h
2 bytes
Number of quantities to be read (LSB)
The instrument will answer with the measured value: 65.8% x 10 = 658 = 0292h
Response
Value
Length
Description
Function
:
04h
1 byte
Measurements reading command
Data
:
02h
1 byte
Number of bytes for the values
02h
Measured RH% value (MSB)
92h
2 bytes
Measured RH% value (LSB)
