Selective Access Read (Rd) - Omron V720S Series Operation Manual

Communications Command

5-3-3-2 Selective Access Read (RD)

In ISO mode, this command reads data from the Tag in communications area by specifying UID
(SNR).
In I.CODE1 mode, this command reads data from the Tag which is specified by the Temporary
Number.
<Command Format>
STX Node No. Command code
1 2
Communi-
cations
method
Data type
Tag
type
*
First read page
No. of read pages
UID
(SNR)
* Tag Type Setting is valid in the operating mode setting range of Reader/Writer.
<Response Format>
STX Node No..
1 2
Response code
Temporary No.
UID(SNR)
Read data
Communi-
cations
"RD"
method
2 2
Specifies the communications method with a Tag.
In ISO
SL: UID (SNR) select
mode
* For details, refer to 5-8 Communications Methods
Specifies the temporary No. in hexadecimal to read from the Tags.
In I.CODE □□: Temporary No. (The value of □□ should be within the range of 00h
mode to 7Fh)
* For details, refer to 5-8 Communications Methods.
Specifies whether the read data is represented in ASCII or HEX.
A: ASCII code
H: HEX code
For details, refer to 5-9 Data type.
In ISO Specify the Tag type.
mode A: I.CODE2 chip
In I.CODE1
"0" fixeded.
mode
Specifies the first page in hexadecimal to read from the Tags.
Specification range: 00 to FFh
be from 00 to 1Bh)
Specification range: FB to 0Ah
* For details, refer to 2-4 Memory Map of Tag.
Specifies the number of the pages in hexadecimal to read from the Tags.
Specification range: 01 to FFh
be 01 to 1Ch)
Specification range: 01 to 10h
In ISO
Specifies UID (SNR) in hexadecimal to read from the Tags.
Mode
In I.CODE1
Not added.
mode
Response
Retry Command
flag code code
"RD" "00"
1 2
00: normal completion
For other response codes, refer to 5-2-4 Response code List.
* ISO mode: Temporary No. is not added.
* I.CODE1 mode: Returns the temporary numbers of "00" to "7F" in normal
conditions.
Indicates UID (SNR) having read from a Tag.
When UID (SNR) (Tag-specific code) additional setting (refer to 5-6-5 SN
Command) is enabled, read data will be preceded by UID. UID(SNR).
Indicates data having read from the Tag. The number of characters of the
data is as follows.
ASCII Code: No. of write pages x 4
HEX code: No. of write pages x 8
Data Tag First read
type type page
1 1 2
Temporary UID(SNR)
No.
2 2 16
No. of read UID(SNR)
pages
2 16
(In ISO Mode: I.CODE2 chip should
(In I.CODE1 Mode)
(In ISO Mode: I.CODE2 chip should
(In I.CODE1 Mode)
Read data
As specified
Section 5-3
ETX BCC
1 1
ETX BCC
1 1
5-13