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 - 41
7 Modbus/TCP Communications
UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
7-6 V780 Command Details
7
7-6-3 Modbus Expansion Communications Commands
Function
This command reads data from the RF Tag in the communications field.
You can specify reading up to 2,048 words with one EXTENDED DATA READ command.
Command Format
Response Formats
• Normal Response
7-6-3 Modbus Expansion Communications Commands
EXTENDED DATA READ
Byte-0 Byte-1 Byte-2 Byte-3 Byte-4 Byte-5 Byte-6 Byte-7 Byte-8 Byte-9 Byte-10 Byte-11
Transaction identi-
fier
Protocol identifier Field length Unit
identifier
Function
code
Subfunction code Read area start
address
X X 0000 hex 000A hex FF hex 64 hex 0001 hex 2 bytes
Byte-12 Byte-13 Byte-14 Byte-15
Read size Options
2 bytes 2 bytes
Parameter Description
Subfunction code 0001 hex: EXTENDED DATA READ
Read area start address Specify in 4-digit hexadecimal the start address for reading data.
Setting ranges (word address specifications)
0000 to 07FF hex: Reserved area
1000 to 17FF hex: EPC area
2000 to 27FF hex: TID area
3000 to 37FF hex: User area
Read size Specify in 4-digit hexadecimal the start address for reading data.
Setting range: 0001 to 0800 hex (2,048 words max.)
Options For details, refer to 7-3 RF Communications Command Options on page 7-9.
Byte-0 Byte-1 Byte-2 Byte-3 Byte-4 Byte-5 Byte-6 Byte-7 Byte-8 Byte-9 Byte-10 Byte-11
Transaction identi-
fier
Protocol identifier Field length Unit
identifier
Function
code
Subfunction code Error code
X X 0000 hex 2 bytes FF hex 64 hex 0001 hex 0000 hex
Byte-1
2
... ... ... ... ... ... ... ... ... Byte-n
Read data Options
1 to 2,048 words (2 to 4,096
bytes)
0 to 68 bytes
StoredPC EPC code Reception level Diagnostic results
2 bytes 62 bytes 2 bytes 2 bytes
Note The contents depend on the options specified in the command.