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Modbus Communication

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ASDA-A3

9

Example 2: function code 06H, writing single word.

In the following example, the master issues a write command to the first slave.

The slave writes data 0064H to address 0200H. The slave sends a response message to the

master after the writing is complete.

ASCII mode:

Command Message (Master):

Start

Slave Address

Function

Start Data Address

Data Content

LRC

End 1

End 0

‘:’

‘0’

‘1’

‘0’

‘6’

‘0’

‘2’

‘0’

‘0’

‘0’

‘0’

‘6’

‘4’

‘9’

‘3’

(0DH) (CR)

(0AH) (LF)

Response Message (Slave):

Start

Slave Address

Function

Start Data Address

Data Content

LRC

End 1

End 0

‘:’

‘0’

‘1’

‘0’

‘6’

‘0’

‘2'

‘0’

‘0’

‘0’

‘0’

‘6’

‘4’

‘9’

‘3’

(0DH) (CR)

(0AH) (LF)

RTU mode:

Command Message (Master):

Response Message (Slave):

Slave Address

Function

Start Data Address

Data Content

CRC (Check Low)

CRC (Check High)

01H

06H

02H (High)

00H (Low)

00H (High)

64H (Low)

89H (Low)

99H (High)

Slave Address

Function

Start Data Address

Data Content

CRC (Check Low)

CRC (Check High)

01H

06H

02H (High)

00H (Low)

00H (High)

64H (Low)

89H (Low)

99H (High)

Note: a silent interval of 10 ms is required before and after each transmission in RTU mode.

9-8

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