A. Modbus®
A.1 Modbus® commands
The commands are all according to the Modbus RTU protocols described in the document: ‘Modbus® over serial line V1.02’ and
‘MODBUS application protocol V1.1b’ available from the Modbus® organization (www.modbus.org). The commands can be tested
using software tools, such as the program ‘Modbus Poll’ from www.modbustools.com.
The following commands are implemented:
Function Sub function Description
0x01 N/A Read Coils
0x02 N/A Read Discrete Inputs
0x03 N/A Read Holding Registers
0x04 N/A Read Input Register
0x05 N/A Write Single Coil
0x06 N/A Write Holding Register
0x10 N/A Write multiple Registers
The SMP does not make a dierence between a ‘coil’ and a discrete input. The only dierence is that a discrete input is read only.
The SMP does not make a dierence between a holding register and an input register. The only dierence is that an input
register is read only.
A.2 Input registers
Input registers are read only
Appendices
Real-time Processed Data
PDU address Parameter Name R/W Type Mode Description
0 IO_DEVICE_TYPE DevType R U All Device type of the sensor
1 IO_DATAMODEL_VERSION DataSet R U All Version of the object data model
2 IO_OPERATIONAL_MODE DevMode R U All Operational mode: normal, service, calibration and so on
3 IO_STATUS_FLAGS Status R U All Device Status flags
4 IO_SCALE_FACTOR Range R S All Range and scale factor sensor data (determines number of decimal places)
5 IO_SENSOR1_DATA Sensor1 R S N,S Temperature compensated radiation in W/m
2
(Net radiation for SGR)
6 IO_RAW_SENSOR1_DATA RawData1 R S N,S Net radiation (sensor 1) in W/m
2
7 IO_STDEV_SENSOR1 StDev1 R S N,S Standard deviation IO_SENSOR1_DATA
8 IO_BODY_TEMPERATURE BodyTemp R S N,S Body temperature in 0.1 °C
9 IO_EXT_POWER_SENSOR VSupply R S N,S External power voltage
10 IO_SENSOR2_DATA Sensor2 R S N,S Temperature compensated long wave down radiation in W/m
2
(only for SGR)
11 IO_RAW_SENSOR2_DATA RawData2 R S N,S Long wave down radiation in W/m
2
(only for SGR)
12 IO_STDEV_SENSOR2 StDev2 R S N,S Not used, always 0
13 IO_BODY_TEMP_K BodyTempK R U N,S Body temperature in 0.01 °K (only for SGR)
14 IO_AUX_INPUT2 Aux2 R S N,S Not used, always 0
15 IO_AUX_INPUT3 Aux3 R S N,S Not used, always 0
16 IO_DAC_OUTPUT_VOLTAGE VDAC R U N,S DAC output voltage or current (actual voltage or current)
17 IO_SELECTED_DAC_INPUT DacInp R U N,S DAC selected input voltage
(1)
The scale factor defines the format and number of decimal places
41
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