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Appendix – KROHNE UFC 400 Modbus EN User Manual

Page 29

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APPENDIX

8

29

UFC 400

www.krohne.com

05/2013 - 4002744801 - AD Modbus UFC 400 R01 en

Function Code 0x03: Read Holding Registers

Function Code 0x04: Read Input Register

Function Code 0x05: Write Single Coil

Function Code 0x08: Diagnostics

Request

Response

Error

Function

0x03

Function

0x03

Function

0x83

Starting Address

Hi

0x00 to 0xFF

Byte Count

2 * n

Exception Code

0x01 / 0x02 /

0x03 / 0x04

Starting Address

Lo

0x00 to 0xFF

Register n Value

Hi

Quantity of

Registers Hi

0x00

Register n Value

Lo

Quantity of

Registers Lo

n (0x01 to 0x7D)

...

...

Request

Response

Error

Function

0x04

Function

0x04

Function

0x84

Starting Address

Hi

0x00 to 0xFF

Byte Count

2 * n

Exception Code

0x01 / 0x02 /

0x03 / 0x04

Starting Address

Lo

0x00 to 0xFF

Input Register n

Hi

Quantity of Input

Registers Hi

0x00

Input Register n

Lo

Quantity of Input

Registers Lo

n (0x01 to 0x7D)

...

...

Request

Response

Error

Function

0x05

Function

0x05

Function

0x85

Output Address Hi 0x00 to 0xFF

Output Address Hi 0x00 to 0xFF

Exception Code

0x01 / 0x02 /

0x03 / 0x04

Output Address Lo 0x00 to 0xFF

Output Address Lo 0x00 to 0xFF

Output Value Hi

0x00 or 0xFF

Output Value Hi

0x00 or 0xFF

Output Value Lo

0x00

Output Value Lo

0x00

Request

Response

Error

Function

0x08

Function

0x08

Function

0x88

Sub-function Hi

0x00 to 0xFF

Sub-function Hi

0x00 to 0xFF

Exception Code

0x01 / 0x03 /

0x04

Sub-function Lo

0x00 to 0xFF

Sub-function Lo

0x00 to 0xFF

Data n Hi

0x00 to 0xFF

Data n Hi

0x00 to 0xFF

Data n Lo

0x00 to 0xFF

Data n Lo

0x00 to 0xFF

...

...

...

...