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Modbus Communication

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ASDA-A3

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9.3 Modbus communication protocol

There are two modes of Modbus network communication: ASCII (American Standard Code for

Information Interchange) and RTU (Remote Terminal Unit). You can set the communication

protocol (ASCII or RTU) with P3.002 according to your requirements. The ASDA-A3 servo drive

also supports these functions: accessing multiple words (03H), writing single word (06H), and

writing multiple words (10H). Refer to the following descriptions.

Code description

ASCII mode:

In ASCII mode, data is transmitted in ASCII (American Standard Code for Information

Interchange) format. For instance, to transmit “64H” between the master and slave, the ASCII

codes “36H” and “34H” are sent to represent ‟6” and “4” respectively.

Note: the servo drive does not support the broadcast mode.

The corresponding ASCII codes for the numbers 0 to 9 and the characters A to F are as follows:

Symbol

ASCII code

Symbol

ASCII code

‘0’

‘1’

‘2’

‘3’

‘4’

‘5’

‘6’

‘7’

30H 31H 32H 33H 34H 35H 36H 37H

‘8’

‘9’

‘A’

‘B’

‘C’

‘D’

‘E’

‘F’

38H 39H 41H 42H 43H 44H 45H 46H

RTU mode:

Each data frame consists of an 8-bit character (hexadecimal), which is more efficient than ASCII

mode for data transmission because it can be done without code interchange. For instance,

when transmitting “64H” between the master and slave, simply send “64H”.

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Call +1(800)985-6929 To Order or Order Online At Deltaacdrives.com