.
Explanation of the received bytes:
01
= MODBUS address
04
= read input registers
10
= number of received data bytes
00 01
= operational mode (mode 1)
00 00
= status flags (none)
00 00 = scale factor = 0 = 1x
03 E5
= 997 decimal = sensor 1 data in W/m²
03 E5
= 997 decimal = raw sensor 1 data in W/m²
00 00
= 0 = standard deviation sensor 1
00 F8
= 248 = 24.8°C.
00 EA
= 234 = 23.4 Volt
66 12
= MODBUS checksum (CRC16)
A.6 Discrete inputs
A discrete input can be true or false. A discrete input is read only; a coil can be read or written.
Status indicators
Input Parameter
R/W Def. Mode Description
0
IO_FALSE
R
0
All
Always false (for testing only)
1
IO_TRUE
R
1
All
Always true (for testing only)
2
IO_VOID_DATA_FLAG
R
*
All
Void signal, 1=unstable signal, temperature too low or too high
3
IO_OVERFLOW_ERROR
R
*
All
Overflow, signal out of range
4
IO_UNDEFLOW_ERROR
R
*
All
Underflow signal out of range
5
IO_ERROR_FLAG
R
*
All
General hardware error (set if one of the H/W error flags is set)
6
IO_ADC_ERROR
R
*
All
Hardware error A/D converter
7
IO_DAC_ERROR
R
*
All
Hardware error D/A converter
8
IO_CALIBRATION_ERROR
R
*
All
Calibration checksum error
9
IO_UPDATE_FAILED
R
*
All
Update calibration parameters failed
Legend
Input
Discrete input
Modbus® discrete input 0 is the first discrete input
Coil
Modbus Coil
A coil can be read or written.
Parameter Name
Name of the register
R/W
Read write
R
Read only
R/W Read/write
Def
Default value
default value at power on (0, 1 or *) * = undefined
Mode
operation mode
N
available in normal mode
S
available in service mode
C
available in calibration mode (not for users)
F
available in factory mode (not for users)
All
available in all modes
Inputs can be read in all modes but some coils can’t be written in normal mode or service mode.
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