LPPYRA13
- 19 -
V2.3
6.2
R
EADING THE MEASURES WITH THE
M
ODBUS
-RTU
PROTOCOL
In MODBUS mode, you can read the values measured by the pyranometer through
the function code 04h (Read Input Registers). The following table lists the quantities
available with the appropriate register address:
Number
Address
Quantity
Format
3
2
Solar radiation in W/m
2
16-bit Integer
4
3
Status register:
bit0=1
⇒
solar radiation measurement error
bit2=1
⇒
configuration data error
bit3=1
⇒
program memory error
16-bit Integer
5
4
Average values of the last 4 measurements
16-bit Integer
6
5
Signal generated by the sensor in µV/10
[e.g.: 816 means 8160 µV, the resolution is 10 µV]
16-bit Integer
Note: Register address = Register number - 1, as defined in the Modbus standard
.
O
PERATING MODE
: the pyranometer enters RS485 MODBUS-RTU mode after 10 sec-
onds from power on. In the first 10 seconds from power on the pyranometer does not
reply to requests from the MODBUS master unit. After 10 seconds, it is possible to
send MODBUS requests to the pyranometer.
Summary of Contents for Delta OHM LPPYRA13
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Page 33: ...LPPYRA13 33 V2 3 NOTES...
Page 34: ...LPPYRA13 34 V2 3 NOTES...
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