Delta Electronics Network Device VFD-S User Manual page 130

Example of an exception response of command code 06H and exception code 02H:
ASCII mode:
STX
ADR 1
ADR 0
CMD1
CMD0
Exception code
LRC CHK 1
LRC CHK 0
END1
END0
The explanation of exception codes:
Exception
code
Illegal command code: The command code received in the command
1
message is not available for the AC drive.
Illegal data address: The data address received in the command
2
message is not available for the AC drive.
Illegal data value: The data value received in the command message
3
is not available for the AC drive.
Slave device failure: The AC drive is unable to perform the requested
4
action.
The AC drive receives the messages, but detects a communication error, thus, no response is
returned, but there will be error message "CExx" displayed on the keypad of AC drive. The
master device will eventually process a timeout condition. The xx of "CExx" is a decimal code,
the meaning of the error message is below:
Error
message
5 Reserved
AC drive busy:
The time interval between commands is too short. Please keep an
6
interval of 10ms at least after the return of a command. If no command
returned, please keep a 10ms interval at least for the same reason.
7 Reserved
8 Reserved
9 Check Sum Error: Check if the Check Sum is correct.
Watchdog Timer: The timer will reset to 0 after each valid Modbus
10
communication message is received.
11 Frame Error: Check if the Baud rate complies with the data format.
12 The command message is too short.
13 Command message length is out of range.
The command messages include the data that does not belong to '0' to
14 '9', 'A' to 'F except starting and end character (only for Modbus ASCII
mode).
Revision August 2008, SE09, SW V2.61
':'
'0'
'1' Exception code
'8'
'6' CRC CHK High
'0'
'2'
'7'
'7'
CR
LF
Meaning
Chapter 5 Parameters|VFD-S Series
RTU mode:
ADR
CMD
CRC CHK Low
Meaning
01H
86H
02H
C3H
A1H
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