Delta Electronics ASDA-B Series Manual Do Utilizador

Chapter 8  MODBUS Communications|ASDA-B Series 

 

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Revision January 2009

When using RS-232/485 serial communication interface, each ASDA-B series AC servo drive has a pre-

assigned communication address specified by parameter “P3-00”. The computer then controls each AC 

servo drive according to its communication address. ASDA-B series AC servo drive can be set up to 

communicate on a MODBUS networks using on of the following modes: ASCII (American Standard Code for 

Information Interchange) or RTU (Remote Terminal Unit). Users can select the desired mode along with the 

serial port communication protocol in parameter “P3-02”. 

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Each 8-bit data is the combination of two ASCII characters. For example, a 1-byte data: 64 Hex, shown as 

‘64’ in ASCII, consists of ‘6’ (36Hex) and ‘4’ (34Hex). 

The following table shows the available hexadecimal characters and their corresponding ASCII codes. 

Character 

‘0’ 

‘1’ 

‘2’ 

‘3’ 

‘4’ 

‘5’ 

‘6’ 

‘7’ 

ASCII 

code 

30H 31H 32H 33H 34H 35H 36H 37H 

Character 

‘8’ 

‘9’ 

‘A’ 

‘B’ 

‘C’ 

‘D’ 

‘E’ 

‘F’ 

ASCII 

code 

38H 39H 41H 42H 43H 44H 45H 46H 

Each 8-bit data is the combination of two 4-bit hexadecimal characters. For example, a 1-byte data: 64 Hex. 

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

7N2 

 

7E1 

 

7O1