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Modbus Communication

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ASDA-A3

9

RTU mode:

Command Message (Master):

Response Message (Slave):

Slave Address

Function

Start Data Address

Data Quantity

(in words)

Data Quantity

(in bytes)

Content of the

1st Data Frame

Content of the

2nd Data Frame

CRC (Check Low)

CRC (Check High)

01H

10H

01H (High)

12H (Low)

00H (High)

02H (Low)

04H

0BH (High)

B8H (Low)

00H (High)

00H (Low)

FCH (Low)

EBH (High)

Slave Address

Function

Start Data Address

Data Quantity

(in words)

CRC (Check Low)

CRC (Check High)

01H

10H

01H (High)

12H (Low)

00H (High)

02H (Low)

E0H (Low)

31H (High)

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

9-10

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