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Modbus RTU Function Codes

24 Modbus® RTU Serial Communications User Manual 02/13

Device Class ID:

The Device Classification. (one byte) (byte 22)

Class ID Class

00 Generic Class (Fixed Address Mapable)

01-FF Future

Generic Class (00) Device Mapping:

Describes the I/O and feature mapping.

Number of

Records

Record

...

Record

Number of records is always 5 for the Minitrend V5 and Multitrend Plus V5.

Number of Records:

1 Byte unsigned value 00-FFh (byte 23)

Record Description:

Byte Description

00 Type of Data Element

(See Data Element Values Table Below)

01 Starting Address of Data Element Record (High)

02 Starting Address of Data Element Record (Low)

03 Number of Data Elements (High)

04 Number of Data Elements (Low)

Data Element Values Table:

Value Description

00* Analog Inputs

01 Analog Outputs

02* Discrete Inputs

03* Discrete Outputs

04 Control Loops

05 Set Point Programmers

06* Math, Calculated Values, or Variables

07 Constants

08 Alarms

09* Totalizers

* These data elements are the 5 data records sent from the Minitrend and the

Multitrend Plus V5 recorders.

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 75 76

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Siemens NAN 67 Series Manual de usuario Pagina 30