Omron V680 Series User Manual

Section 7 Modbus Communications Protocol
Section 7
Host Communications Specifications
161
RFID System
User's Manual
(Modbus TCP)
 Error End
Transaction Identifier
A copy of the value that was specified in the query is returned.
Protocol Identifier
This field is always 0000 hex.
Field Length
The number of bytes inclusively from the unit identifier through the end of the data is specified.
Byte 4 will always be 00 hex.
Unit Identifier
This field is always FF hex.
Function Code
A value of 80 hex is added to the value that was specified in the query and set.
Exception Code
A code that provides information on the error is attached.
Exception code Meaning
01 hex Illegal function
02 hex Illegal data address
03 hex Illegal data value
04 hex Failure in slave device
06 hex Slave device busy
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
identifier
Function
code
Exception
code
Copy of the transaction
identifier that was specified
in the query
Always 0000 hex
Always
00 hex
No. of
bytes
Always
FF hex
Range specified with the field length

Omron V680 Series Specifications

General

Brand	Omron
Model	V680 Series
Category	Other
Language	English