Chapter 5 Parameters_VFD-B Series
Revision 10/2005, BE13, SW V4.08 5-103
ASCII mode:
RTU mode:
STX ‘:’ Address 01H
‘0’ Function 86H
Address Low
Address High
‘1’ Exception code 02H
‘8’ CRC CHK Low C3H
Function Low
Function High
‘6’ CRC CHK High A1H
‘0’
Exception code
‘2’
‘7’
LRC CHK Low
LRC CHK High
‘7’
CR
END 1
END 0
LF
The explanation of exception codes:
Exception
code
Explanation
01
Illegal function code:
The function code received in the command message is not available for the AC motor drive.
02
Illegal data address:
The data address received in the command message is not available for the AC motor drive.
03
Illegal data value:
The data value received in the command message is not available for the AC drive.
04
Slave device failure:
The AC motor drive is unable to perform the requested action.
10
Communication time-out:
If Pr.09-03 is not equal to 0.0, Pr.09-02=00~02, and there is no communication on the bus during
the Time Out detection period (set by Pr.09-03), “cE10” will be shown on the keypad.
3.7 Communication program of PC:
The following is a simple example of how to write a communication program for Modbus ASCII mode on a
PC by C language.
#include<stdio.h>
#include<dos.h>
#include<conio.h>
#include<process.h>
#define PORT 0x03F8 /* the address of COM1 */
/* the address offset value relative to COM1 */
#define THR 0x0000
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