Campbell Scientific CR3000 CR3000 Micrologger - Page 374
Programming for Modbus
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Section 8. Operation 8.6.2.3 Programming for Modbus 8.6.2.3.1 Declarations Table CRBasic Ports, Flags, Variables, and Modbus Registers (p. 374) shows the linkage between CR3000 ports, flags and Boolean variables and Modbus registers. Modbus does not distinguish between CR3000 ports, flags, or Boolean variables. By declaring only ports, or flags, or Boolean variables, the declared feature is addressed by default. A typical CRBasic program for a Modbus application will declare variables and ports, or variables and flags, or variables and Boolean variables. Table 92. CRBasic Ports, Flags, Variables, and, Modbus Registers CR3000 Feature Example CRBasic Declaration Equivalent Example Modbus Register Control Port (Port) Public Port(8) 00001 to 00009 Flag Boolean Variable Variable Public Flag(17) Public ArrayB(56) as Boolean Public ArrayV(20)* 00001 to 00018 00001 to 00057 40001 to 40041* or 30001 to 30041* *Because of byte-number differences, each CR3000 domain variable translates to two Modbus domain input / holding registers. 8.6.2.3.2 CRBasic Instructions - Modbus Complete descriptions and options of commands are available in CRBasic Editor Help. ModbusMaster() Sets up a CR3000 as a Modbus master to send or retrieve data from a Modbus slave. Syntax ModbusMaster(ResultCode, ComPort, BaudRate, ModbusAddr, Function, Variable, Start, Length, Tries, TimeOut) ModbusSlave() Sets up a CR3000 as a Modbus slave device. Syntax ModbusSlave(ComPort, BaudRate, ModbusAddr, DataVariable, BooleanVariable) MoveBytes() Moves binary bytes of data into a different memory location when translating big‐endian to little‐endian data. Syntax MoveBytes(Dest, DestOffset, Source, SourceOffset, NumBytes) 374
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