Delta Electronics ASDA-B2 series User Manual

ASDA-B2 Chapter 8 MODBUS Communications
Revision September 2013 8-7
8.3 MODBUS Communication Protocol
When using RS-232/485 serial communication interface, each ASDA-B2 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-B2 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”.
 Code Description:
ASCII Mode:
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
RTU Mode:
Each 8-bit data is the combination of two 4-bit hexadecimal characters. For example, a 1-
byte data: 64 Hex.
 Data Format:
10-bit character frame (For 7-bit character)
7N2
Start
bit
01
2
3456
Stop
bit
7-data bits
10-bits character frame
Stop
bit
7E1
Even
parity
Start
bit
01
2
3456
Stop
bit
7-data bits
10-bits character frame
7O1
Odd
parity
Start
bit
01
2
3456
Stop
bit
7-data bits
10-bits character frame
VARITEL INGENIERIA ELECTRONICA S.A.
info@varitel.com - www.varitel.com - Tel. (54) 11-4243-1171 / Fax: (54) 11-4292-7545
Manuel Baliña 456, Lomas de Zamora (B1832CCJ) Buenos Aires, Argentina.

Delta Electronics ASDA-B2 series Specifications

General

Brand	Delta Electronics
Model	ASDA-B2 series
Category	Servo Drives
Language	English