Omron V780 Series User Manual page 202

7 Modbus/TCP Communications
EXTENDED MULTIACCESS DATA READ
 Function
This command reads data from multiple RF Tags in the communications range.
You can get data from more than one RF Tag with one EXTENDED MULTIACCESS DATA READ
command.
 Command Format
Byte-0 Byte-1
Transaction identi-
fier
X X
Byte-12 Byte-13
Read size
2 bytes
Parameter
Subfunction code
Read area start address
Read size
Options
 Response Formats
• Normal Response or Error Response: RF Tag Communication Error
Byte-0 Byte-1
Transaction identi-
fier
X X
Byte-12
Information from RF Tag 1
n = 4 to 134 bytes
Error code
2 bytes
7 - 50
Byte-2 Byte-3 Byte-4
Protocol identifier Field length
0000 hex 000A hex
Byte-14 Byte-15
Options
2 bytes
0004 hex: EXTENDED MULTIACCESS DATA READ
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: UII (EPC) area
2000 to 27FF hex: TID area
3000 to 3FFF hex: User area
Specify in 4-digit hexadecimal the start address for reading data.
Setting range: 0001 to 0020 hex (1 to 32)
For details, refer to 7-3 RF Communications Command Options on page 7-10.
Byte-2 Byte-3 Byte-4
Protocol identifier Field length
0000 hex 2 bytes
... Byte-12 + n - 1
Information from RF Tag x
Read data
2 to 64 bytes
Byte-5 Byte-6 Byte-7
Unit Function
identifier code
FF hex 64 hex
Description
Byte-5 Byte-6 Byte-7
Unit Function
identifier code
FF hex 64 hex
Byte-12+n*
...
(m-1)
...
...
StoredPC UII (EPC
2 bytes 62 bytes
UHF RFID System V780-series Reader/Writer User's Manual (Z389)
Byte-8 Byte-9 Byte-10
Subfunction code Read area start
address
0004 hex 2 bytes
Byte-8 Byte-9 Byte-10 Byte-11
Subfunction code Number of RF
Tags (m)
0004 hex 0000 to 0040 hex
Byte-12+
...
(n*m)-1
Information from RF Tag m
n = 4 to 134 bytes
Options
0 to 66 bytes
Reception Reader/Writer
code) level Number
2 bytes 2 bytes
Byte-11