Hiwin D2 Series User Manual

Modbus Communication D2 Series Servo Drive User Manual
13-2 HIWIN MIKROSYSTEM CORP.
MD07UE01-2005
13.1 Modbus communication specification
The Modbus communication specification for D2-series drives is shown in the following table.
Table13.1.1
Interface RS-485 2W-cabling
Communication Cycle Asynchronous (half duplex)
Communication
Parameters
Baud rate 2,400, 4,800, 9,600 (default), 14,400, 19,200, 38,400 bps
Protocol RTU (default), ASCII
Data length
(note 1)
8 bits (default), 7 bits
Parity Even (default), odd, none
Start bit 1 bit
Start bit
(note 2)
1 bit (default), 2 bits
Slave address 1 - 247
Note:
(1) The data length in the RTU communication protocol is 8 bits; while that in the ASCII communication protocol is
7 bits.
(2) The stop bit for the odd parity and even parity is 1 bits; while that for the none parity is 2 bits.
13.2 Function code
D2-series drives provide three types of function code, as given in the following table.
Table13.2.1
Function Code Definition
Message Length (Bytes)
Command Response*
Max Min Max Min
03h
Read holding registers
8 8 255 7
04h
Read input registers
8 8 255 7
10h
Write multiple registers
255 11 8 8
Note:
*The message length of exception response is 5 bytes.
(1) Read holding registers (03h)
This function is used to read the contents of the consecutive blocks of holding registers in the drive.
The related data format is given in the following table. The content of each register is divided into the
8-bits higher data (“Hi”) and the 8-bits lower data (“Lo”). The maximum of consecutive blocks read at
the same time is 125.

Hiwin D2 Series Specifications

General

Brand	Hiwin
Model	D2 Series
Category	Servo Drives
Language	English