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 Modbus/TCP Communications
7 - 34
UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
• Error Response
Execution Examples
Specifying Getting the Results of Multiaccess Reading of the IDs by the Reader/Writer with No
Options
There are three RF Tags in the communications field.
Getting the First Results (Getting the Communications Results for RF Tag A)
TX: 000000000006FF0391000022
RX: 000000000047FF0344000300003000AAAA…AAAA0000…0000
Parameter Description
Field length Gives the total number of bytes starting from the unit identifier in 4-digit
hexadecimal.
0047 hex + Option size
• For details on option sizes, refer to 7-3 RF Communications Command
Options on page 7-9.
Byte count Gives the total number of bytes starting from the number of RF Tags in
2-digit hexadecimal.
44 hex + Option size
• For details on option sizes, refer to 7-3 RF Communications Command
Options on page 7-9.
Number of RF Tags Gives the number of RF Tags that were read in 4-digit decimal. (0001 to
001F hex)
The number of RF Tags is decremented when a command response is
returned.
Error code Gives the RF Tag access results in 4-digit hexadecimal.
0000 hex: Normal end
Not 0000 hex: Error code
• For details on the error codes, refer to ?9-2-1 ?????? (P.9-3)?.
StoredPC Gives the StoredPC data in 4-digit hexadecimal.
The upper 5 bits are the EPC word length.
EPC code Gives the Tag-specific information according to Gen2 standards.
All bytes of the EPC code section that exceed the EPC word length in the
StoredPC are filled with 00 hex.
Options This section may be omitted depending on the option value for the SET
MULTIACCESS ID READ command.
Reception level The reception level is attached in signed 4-digit hexadecimal.
FFFF to FF9D hex (−1 to -99 [dBm])
Byte-0 Byte-1 Byte-2 Byte-3 Byte-4 Byte-5 Byte-6 Byte-7 Byte-8
Transaction identi-
fier
Protocol identifier Field length Unit
identifier
Function
code
Excep-
tion code
X X 0000 hex 0003 hex FF hex 83 hex 1 byte
Parameter Description
Exception code For details, refer to Exception Code on page 7-7 under Response Format for Error
Completion on page 7-7.