Omron V780 Series User Manual page 200

7 Modbus/TCP Communications
EXTENDED MULTIACCESS ID READ
 Function
This command reads the IDs (UIIs (EPC codes)) of multiple RF Tags in the communications range.
You can get the IDs (UIIs (EPC codes)) of more than one RF Tag with one EXTENDED MULTIAC-
CESS ID READ command.
 Command Format
Byte-0 Byte-1
Transaction identi-
fier
X X
Parameter
Subfunction code
Options
 Response Formats
• Normal Response or Error Response: RF Tag Communications Error
Byte-0 Byte-1
Transaction identi-
fier
X X
Byte-12 ...
Information from RF Tag 1
n = 66 to 70 bytes
Error code
2 bytes
Parameter
Field length
Number of RF Tags
7 - 48
Byte-2 Byte-3 Byte-4
Protocol identifier Field length
0000 hex 0006 hex
0003 hex: EXTENDED MULTIACCESS ID READ
For details, refer to 7-3 RF Communications Command Options on page 7-10.
Byte-2 Byte-3 Byte-4 Byte-5
Protocol identifier Field length
0000 hex 2 bytes
Byte-12 +
...
n - 1
...
...
Information from RF Tag x
StoredPC UII (EPC code)
2 bytes 62 bytes
0048 to 0F86 hex + (Option size × m)
• For details on option sizes, refer to 7-3 RF Communications Com-
mand Options on page 7-10.
Gives the number of RF Tags that were detected in 4-digit decimal.
0000 to 0040 hex (0 to 64)
Byte-5 Byte-6 Byte-7
Unit Function
identifier code
FF hex 64 hex
Description
Byte-6 Byte-7
Unit Function
identifier code
FF hex 64 hex
Byte-12+n Byte-12+(
...
*(m-1) n*m)-1
Information from RF Tag m
n = 66 to 70 bytes
Options
Reception level Reader/Writer Number
2 bytes
Description
UHF RFID System V780-series Reader/Writer User's Manual (Z389)
Byte-8 Byte-9 Byte-10 Byte-11
Subfunction code Options
0003 hex 2 bytes
Byte-8 Byte-9 Byte-10 Byte-11
Subfunction code Number of RF
Tags (m)
0003 hex 0000 to 0040 hex
2 bytes