Spectris PARTICLE MEASURING SYSTEMS MiniCapt, Руководство по эксплуатации

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A-2
MiniCapt® Mobile Operations Manual
Appendix A : Communications Input Registers
• Any registers accessed but not defined will generate an address error.
• Spare coils/registers will “set” without error and always return a zero value.
• Registers set with invalid data will return a function error.
The map delineates three types of register assemblies:
Unary:
an individual 16 bit register
Dual:
a register pair used for a 32 bit representation
String:
a group of registers containing ASCII bytes
There is a setting available that toggles the interpretation of selected dual-register
values. These values can be interpreted as integer representations of floating point
numbers with a fixed scaling factor or as IEEE-754 floating point representations of that
value. Refer to the register map to determine which register pairs have this feature
applied. This setting can be set real-time via the associated coil.
Even though the Modbus protocol itself is standard, the contents of the registers are
application specific. A description of the register map is the definitive specification for
that application interface. The following Modbus register map definition has
comments and notes to help with its intended use.
Input Registers
The input registers are in two sections: Configuration and Data .
Configuration Section
The Configuration section contains:
• Modbus Map Version
• Sensor Firmware Version
• Product Name
• flowrate and Volume Scale Factors
• flowrate
• Number of channels (Particle & Analog)