Campbell Scientific CR6 CR6 Measurement and Control System - Page 416
Addressing ModbusAddr, 6.3.2.4 Supported Modbus Function Codes, 6.3.2.5 Reading Inverse-
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Section 8. Operation MoveBytes() Moves binary bytes of data into a different memory location when translating bigendian to little-endian data. See the appendix Endianness (p. 593). Syntax MoveBytes(Dest, DestOffset, Source, SourceOffset, NumBytes) 8.6.3.2.3 Addressing (ModbusAddr) Modbus devices have a unique address in each network. Addresses range from 1 to 247. Address 0 is reserved for universal broadcasts. When using the NL100, use the same number as the Modbus and PakBus address. 8.6.3.2.4 Supported Modbus Function Codes Modbus protocol has many function codes. CR6 commands support the following. Table 109. Supported Modbus Function Codes Code Name Description 01 Read coil/port status Reads the on/off status of discrete output(s) in the ModBusSlave 02 Read input status Reads the on/off status of discrete input(s) in the ModBusSlave 03 Read holding registers Reads the binary contents of holding register(s) in the ModBusSlave 04 Read input registers Reads the binary contents of input register(s) in the ModBusSlave 05 Force single coil/port Forces a single coil/port in the ModBusSlave to either on or off 06 Write single register Writes a value into a holding register in the ModBusSlave 15 Force multiple coils/ports Forces multiple coils/ports in the ModBusSlave to either on or off 16 Write multiple registers Writes values into a series of holding registers in the ModBusSlave 8.6.3.2.5 Reading Inverse-Format Modbus Registers Some Modbus devices require reverse byte order words (CDAB vs. ABCD). This can be true for either floating point, or integer formats. Since a slave CR6 uses the ABCD format, either the master has to make an adjustment, which is sometimes possible, or the CR6 needs to output reverse-byte order words. To reverse the byte order in the CR6, use the MoveBytes() instruction as shown in the sample code below. for i = 1 to k MoveBytes(InverseFloat(i),2,Float(i),0,2) MoveBytes(InverseFloat(i),0,Float(i),2,2) next 416
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