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ASDA-A3

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Modbus Communication

Characters are encoded into the following frames and transmitted in series. The methods for

checking each type of frame are as follows.

ASCII mode:

10-bit character frame (for 7-bit character)

L

7N2 Start

bit

0

1

2

3

4

5

7-data bits

10-bit character frame

HH

6

Stop Stop

bit bit

L

H

7E1 Start

bit

0

1

2

3

4

5

6

Even Stop

Parity bit

7-data bits

10-bit character frame

L

H

7O1 Start

bit

0

1

2

3

4

5

6

Odd Stop

Parity bit

7-data bits

10-bit character frame

9

RTU mode:

11-bit character frame (for 8-bit character)

L

8N2 Start

bit

0

1

2

3

4

5

6

8-data bits

11-bit character frame

H

7 Stop Stop

bit

bit

L

H

8E1 Start

bit

0

1

2

3

4

5

6

7 Even Stop

parity bit

8-data bits

11-bit character frame

L

H

8O1 Start

bit

0

1

2

3

4

5

6

7 Odd Stop

parity bit

8-data bits

11-bit character frame

9-5

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