Omron V780 Series, Руководство пользователя

Страница: 196 / 398

7 Modbus/TCP Communications
7 - 44 UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
 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
 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: UII (EPC) area
2000 to 27FF hex: TID area
3000 to 3FFF 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 7-10.
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-12 ... ... ... ... ... ... ... ... ... ... ... Byte-n
Read data Options
1 to 2,048 words
(2 to 4,096 bytes)
0 to 70 bytes
StoredPC UII (EPC code) Reception level Diagnostic
results
Reader/Writer
Number
2 bytes 62 bytes 2 bytes 2 bytes 2 bytes
Note The contents depend on the options specified in the command.