User's Manual
Table Of Contents
- Modbus/TCP Communications
- 7-1 Outline
- 7-2 Message Formats
- 7-3 RF Communications Command Options
- 7-4 Communications Procedure
- 7-5 Commands
- 7-6 V780 Command Details
- 7-6-1 Single-access Communications Commands
- 7-6-2 Multiaccess Communications Commands
- 7-6-3 Modbus Expansion Communications Commands
- 7-6-4 Reader/Writer Control Commands
- 7-6-5 Reader/Writer Setting Commands: Network Settings
- 7-6-6 Reader/Writer Setting Commands: Communications Settings
- 7-6-7 Reader/Writer Setting Commands: Device Settings
- 7-6-8 Maintenance Commands: Device Information
- 7-6-9 Maintenance Commands: Log Information
- 7-6-10 Maintenance Commands: RF Communications Information
7 - 7
7 Modbus/TCP Communications
UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
7-2 Message Formats
7
7-2-3 Response Format for Error Completion
The value that was specified in the command is set.
This field is always 0000 hex.
This field is always 0003 hex.
This field is always FF hex.
The value of the function code that was specified in the command plus 80 hex is set.
A code that provides information on the error is set.
You can use the error code to identify the error that was detected by the Reader/Writer. The exception
code and error code are related as given below. Refer to the most recent command error information or
command error log to check details on the error using the error code.
7-2-3 Response Format for Error Completion
Byte-0 Byte-1 Byte-2 Byte-3 Byte-4 Byte-5 Byte-6 Byte-7 Byte-8
Transaction identifier Protocol identifier Field length
Unit identi-
fier
Function
code
Exception
code
XXXX hex Always 0000 hex. Always 0003 hex.
Always FF
hex.
83 hex, 90
hex, or E4
hex
XX hex
X: Any value
Transaction Identifier
Protocol Identifier
Field Length
Unit Identifier
Function Code
Exception Code
Exception
code
Exception code meaning V780 error code
01 hex Illegal function
1001 hex Frame length error
1002 hex Frame header error
1003 hex Unknown command error
02 hex Illegal data address 1004 hex Command format error
03 hex Illegal data value 1005 hex Command parameter error
04 hex Failure in slave device
2*** hex RF Tag communications error
1018 hex Command execution failure, minor fault
101F hex Command execution failure, major fault
06 hex Slave device busy 1011 hex Command execution failure, busy
Range included in the field length.