Thermo Scientific AquaSensors™ DataStick™ Modbus ...

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5.1.2.2 Scale Factors Most Scale Factors are fixed, e.g., the Cell Constant Scale Factor is fixed at 1000, but some depend on the type of Sensor Head installed in the DataStick. The Sensor Value Scale Factor is one of these. For example, when the installed Sensor Head is pH, the Sensor Value Scale Factor is 100, but when the installed Sensor Head is ORP, the Sensor Value Scale Factor is 1. 5.1.3 Class Configuration Value This class of variable represents a value that configures some aspect of the operation of the DataStick, e.g., Sensor Units, or the Modbus Adapter. Variables of this class are static, non-volatile, and are stored in the DataStick or the Modbus Adapter. This class of variable exists in two types: integer and float. 5.1.4 Class Information This class of variable is used for informational purposes only. Variables of this class are static, nonvolatile, and are stored in the DataStick, e.g., Main Serial Number. This class of variable exists in two types: integer and ASCII. All of them have been grouped into a single register bank. 5.1.5 Class Calibration This class of variable instructs the DataStick to perform the action of calibrating itself. All calibrations involve a multi-step procedure, and one of the steps involves writing a calibration variable. 5.1.6 Class Status All variables of class Status have been grouped into a single register bank. 5.1.6.1 Originating in the DataStick This class of variable is used for indicating the status of the DataStick, e.g., Calibration Status. However, variables of this class are not static. Variables of this class are of type integer. 5.1.6.2 Originating in the Modbus Adapter There is a unique Status variable that originates in the Modbus Adapter itself called Communications Status. The values that this variable can take on are defined in Table 8. On power-up, when communication has started but before the Modbus Adapter has read the Sensor and Temperature Values from the DataStick, Communications Status is Okay; while the DataStick is absent, Communications Status is “Communications error”; and, while the Modbus Adapter is communicating with the DataStick, Communications Status is “Data is valid”. This variable is of type integer. Thermo Scientific AquaSensors DataStick Modbus Communications User Guide 12
Table 8: Communications Status variable values and their meaning Value Meaning 0 Okay 1 Communications error 2 Data is valid Thermo Scientific AquaSensors DataStick Modbus Communications User Guide 13
Page 1 and 2: Thermo Scientific AquaSensors Data
Page 3 and 4: Table of Contents 1 Introduction...
Page 5 and 6: 2 Hardware Setup The DataStick cons
Page 7 and 8: The Modbus Adapter can be removed a
Page 9 and 10: Table 3: Supported Baud Rates Baud
Page 11 and 12: 4 Function Codes The Modbus Adapter
Page 13: The Modbus adapter responds with an
Page 17 and 18: Register Number Description Data Ty
Page 19 and 20: Register Number 42041 42042 42043 4
Page 21 and 22: Register Number Description Data Ty
Page 23 and 24: 8 Limited Warranty WARRANTY/REPLACE
Page 26: Thermo Fisher Scientific Environmen

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