Communication Parameter Settings; Modbus Communication Protocol - Delta ASDA-B3 Series User Manual

ASDA-B3
9.2 RS-485 communication parameter settings
The required parameters for a single servo drive connection are: P3.000 (Address), P3.001
(Transmission speed), and P3.002 (Communication protocol). P3.003 (Communication error
handling), P3.004 (Communication timeout), P3.006 (Digital input (DI) control switch), and
P3.007 (Communication response delay time) are optional settings. Refer to Chapter 8 for
detailed descriptions of the relevant parameters.

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-B3 servo drive
also supports these functions: reading 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 format. For instance, when transmitting "64H"
between the master and slave, the master sends 36H to represent "6" and 34H to represent "4".
The ASCII codes for the digits 0 to 9 and the characters A to F are as follows:
Character
ASCII code
Character
ASCII code
'0' '1' '2'
30H 31H 32H
'8' '9' 'A'
38H 39H 41H
MODBUS Communication
'3' '4' '5'
33H 34H 35H
'B' 'C' 'D'
42H 43H 44H
9
'6' '7'
36H 37H
'E' 'F'
45H 46H
9-3