User`s manual

53
RFID System
User's Manual
Section 3
V680 Commands
Section 3
Commands
Communications Commands
Details of communications commands used to communicate with the ID Tag are provided here.
■ READ (RD)
This command reads up to 2 Kbytes of data from the ID Tag.
Communications specifi-
cation
Specifies the method for communicating with the ID Tag.
Refer to Communications with the ID Tag for details on the communications specification.
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Data setting Sets the code format used to send responses for read data.
A: ASCII
H: Hexadecimal
Fixed value Always 1.
Read area start address Specifies the start address of the area to be read from the ID Tag in 4-digit hexadecimal.
Setting range: 0000 to FFFF hex
Number of bytes to read Specifies the number of bytes to be read from the ID Tag in 4-digit hexadecimal.
The maximum number of bytes that can be read at one time is 2 Kbytes, as follows:
Setting range: 0001 to 0800 hex
•ASCII: 2,048 bytes (2,048 characters)
•Hexadecimal: 2,048 bytes (4,096 characters)
End code Indicates the execution result for the command.
The end code 00 indicates normal completion.
For details on end codes, refer to End Codes.
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Fixed value Always 1.
Resend flag Always 0.
Read data Specifies the data read from the ID Tag.
The characters in ASCII indicate the number of read bytes and the characters in hexadecimal indi-
cate the number of read bytes x 2.
Command
RD
1
2
2
CR
A/H
××
4
×
××
2
11
×××××
4
Command
code
Data
setting
Number of bytes
to read
Terminator
Read area
start address
Communica-
tions
specification
Fixed
value
Response
RD
0
2
2
CR
1
00
2
11
×××…×
n
TerminatorRead data
End code
Command
code
Fixed
value
Resend
flag