User's Manual

7 Modbus/TCP Communications
7 - 20
UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
7-6 V780 Command Details
 Function
This command reads the ID (i.e., the EPC code) of the RF Tag in the communications field.
 Command Format
 Response Formats
• Normal Response
Note If the reception level is required, use GET RF TAG ADDITIONAL INFORMATION on page 7-121.
Additional Information
• StoredPC Bit Format
7-6-1 Single-access Communications Commands
READ ID
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
Register address Word count
X X 0000 hex 0006 hex FF hex 03 hex 4000 hex 0020 hex
Parameter Description
Register address The register address (4000 hex) that specifies reading the ID
Word count The number of words in the read StoredPC and EPC code (always 0020 hex).
Byte-0 Byte-1 Byte-2 Byte-3 Byte-4 Byte-5 Byte-6 Byte-7 Byte-8 Byte-9 Byte-10
Transaction identi-
fier
Protocol identifier Field length Unit
identifier
Function
code
Byte
count
StoredPC
X X 0000 hex 0043 hex FF hex 03 hex 40 hex 2 bytes
Byte-11 … Byte-72
EPC code
62 bytes
Parameter Description
StoredPC Gives the StoredPD data in 4-digit hexadecimal.
The upper 5 bits are the EPC word length. (Refer to StoredPC Bit Format on page
20, below.)
EPC code Gives the Tag-specific information according to Gen2 standards.
All bytes of the EPC code section that exceed the EPC word length in the StoredPC
are filled with 00 hex.
10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F
PC + EPC length
16 x (n + 1)
RFU 0:EPS
1:AFI
Data