Chapter 5 Parameters|VFD-B Series 
Revision July 2008, BE16, SW V4.08 & V5.00  5-87 
ASCII mode: 
Command message:    Response message: 
STX ‘:’   STX ‘:’ 
‘0’   ‘0’ 
Address 
‘1’  
Address 
‘1’ 
‘0’   ‘0’ 
Function 
‘6’  
Function 
‘6’ 
‘0’   ‘0’ 
‘1’   ‘1’ 
‘0’   ‘0’ 
Data address 
‘0’  
Data address 
‘0’ 
‘1’   ‘1’ 
‘7’   ‘7’ 
‘7’   ‘7’ 
Data content  
‘0’  
Data content 
‘0’ 
‘7’   ‘7’ 
LRC Check 
‘1’  
LRC Check 
‘1’ 
CR   CR 
END 
LF  
END 
LF 
RTU mode: 
Command message: 
 Response message: 
Address 01H   Address 01H 
Function 06H   Function 06H 
01H   01H 
Data address 
00H  
Data address 
00H 
17H   17H 
Data content 
70H  
Data content 
70H 
CRC CHK Low  86H    CRC CHK Low  86H 
CRC CHK High  22H    CRC CHK High  22H 
 
(3) 08H: loop detection
 
This command is used to detect if the communication between master device (PC or PLC) and AC 
motor drive is normal. The AC motor drive will send the received message to the master device. 
ASCII mode: 
Command message:    Response message: 
STX ‘:’   STX ‘:’ 
‘0’   ‘0’ 
Address 
‘1’  
Address 
‘1’ 
‘0’   ‘0’ 
Function 
‘8’  
Function 
‘8’ 
‘0’   ‘0’ 
‘0’   ‘0’ 
‘0’   ‘0’ 
Data address 
‘0’  
Data address 
‘0’ 
‘1’   ‘1’ 
‘7’   ‘7’ 
‘7’   ‘7’ 
Data content  
‘0’  
Data content 
‘0’ 
LRC Check  ‘7’    LRC Check  ‘7’