Section 7 Modbus Communications Protocol
Section 7
Host Communications Specifications
167
RFID System
User's Manual
(Modbus TCP)
Exception Code Table
End Codes
The end code consists of two words in the format that is shown in the following table.
Error Codes
The error code consists of two bytes that give the result of Reader/Writer processing.
For details on the error codes, refer to Error Codes in this section.
p.168
Model Number Information
Information on the device where the error occurred is given in one byte.
Exception code Meaning
00 hex Normal end
01 hex Illegal function
• Frame header values are incorrect.
• The function code is incorrect.
• The frame length is incorrect.
02 hex Illegal data address
• The value in the address field is incorrect.
03 hex Illegal data value
• A parameter value is incorrect.
04 hex Failure in slave device
• The Reader/Writer detected an error (error in RF Tag communications, hardware fault, etc.).
06 hex Slave device busy
• The query cannot be executed.
Error code
Model number
information
(Reserved)
Always 00 hex
2 bytes 1 byte 1 byte
Model number
information
Meaning
00 hex An error occurred in the local device.
01 hex
An error occurred in the other Reader/Writer.
If the COPY DATA query is sent and the error occurred at the copy destination Reader/Writer, the error
source model number information is set to 01 hex.
Or, an error occurred in Slave No. 1 for Reader/Writer extension functions.
02 hex An error occurred in Slave No. 2 for Reader/Writer extension functions.
03 hex An error occurred in Slave No. 3 for Reader/Writer extension functions.
04 hex An error occurred in Slave No. 4 for Reader/Writer extension functions.
05 hex An error occurred in Slave No. 5 for Reader/Writer extension functions.
06 hex An error occurred in Slave No. 6 for Reader/Writer extension functions.
07 hex An error occurred in Slave No. 7 for Reader/Writer extension functions.
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