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7 Modbus/TCP Communications
UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
7-
6 V780 Co
mm
and
Detail
s
7
7-6
-3 Modbu
s Expansion C
ommunications Commands
• Error Response: Command Error
Execution Examples
Reading 4 Words of Data Starting from Word Address 0123 Hex (User Area) in Multiple RF Tags
with No Options
Example 1: Execution When Four RF Tags Are in the Communications Range
TX: 00000000000AFF640004312300040000
RX: 00000000002EFF6400040004
0000AAAAAAAAAAAAAAAA:
RF Tag A error code + Read data (4 words, all AAAA hex)
0000BBBBBBBBBBBBBBBB:
RF Tag B error code + Read data (4 words, all BBBB hex)
0000CCCCCCCCCCCCCCCC:
RF Tag C error code + Read data (4 words, all CCCC hex)
2002000000000000000000:
RF Tag D error code (2002 hex (RF Tag communications fail-
ure))
Example 2: Execution When an RF Tag Is Not in the Communications Range (Exception Code: 04
Hex (Failure in Device))
TX: 00000000000AFF640004312300040000
RX: 000000000003FFE404
Parameter
Description
Field length
000A to 2106 hex + (Option size × m)
• For details on option sizes, refer to
Number of RF Tags
Gives the number of RF Tags that were detected in 4-digit decimal.
0000 to 0040 hex (0 to 64)
Information
from RF Tag
1
Error code
For details, refer to
Read data
The data that was read from the RF Tag is attached.
The bytes that exceed the word count will be filled with 00 hex.
Options
This section may be omitted depending on the option value for the
SET MULTIACCESS ID READ command.
StoredPC
Gives the StoredPC data in 4-digit hexadecimal.
The upper 5 bits are the UII (EPC) word length.
UII (EPC
code)
Gives the Tag-specific information according to Gen2 standards.
All bytes of the UII (EPC code) section that exceed the UII (EPC) word
length in the StoredPC are filled with 00 hex.
Reception
level
The reception level is attached in signed 4-digit hexadecimal.
FFFF to FF9D hex (-1 to -99 [dBm])
Reader/Writer
Number
This displays the Reader/Writer number of the reader/writer communi-
cating with the RF Tag in 4 hexadecimal digits.
0000 hex to 0007 hex
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
E4 hex
1 byte
Parameter
Description
Exception code
For details, refer to
Summary of Contents for V780 Series
Page 22: ...Version Upgrade Information 20 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Page 60: ...3 Part Names and Functions 3 14 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Page 152: ...6 Functions 6 76 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Page 334: ...8 Browser Interface 8 44 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Page 358: ...9 Troubleshooting 9 24 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Page 392: ...Appendices A 30 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Page 393: ...I 1 I UHF RFID System V780 series Reader Writer User s Manual Z389 Index ...
Page 397: ......