Modbus Expansion Communications Commands - Omron V780 Series User Manual

7 Modbus/TCP Communications
7-6-3

Modbus Expansion Communications Commands

EXTENDED DATA READ
 Function
This command reads data from the RF Tag in the communications range.
You can specify reading up to 2,048 words with one EXTENDED 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
Byte-0 Byte-1
Transaction identi-
fier
X X
Byte-12 ...
Read data
1 to 2,048 words
(2 to 4,096 bytes)
7 - 44
Byte-2 Byte-3 Byte-4
Protocol identifier Field length
0000 hex 000A hex
Byte-14 Byte-15
Options
2 bytes
0001 hex: EXTENDED 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 0800 hex (2,048 words max.)
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
... ... ...
StoredPC UII (EPC code)
2 bytes
Note The contents depend on the options specified in the command.
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
... ... ... ...
Options
0 to 70 bytes
Reception level
62 bytes 2 bytes
UHF RFID System V780-series Reader/Writer User's Manual (Z389)
Byte-8 Byte-9 Byte-10 Byte-11
Subfunction code Read area start
address
0001 hex 2 bytes
Byte-8 Byte-9 Byte-10 Byte-11
Subfunction code Error code
0001 hex 0000 hex
... ... ...
Diagnostic Reader/Writer
results Number
2 bytes 2 bytes
Byte-n