Tag Detection (Rd): I.code1 Mode Only; Selective Access Read/Write - Omron V720S Series Operation Manual

Communications Command

5-3-3 Selective Access Read/Write

5-3-3-1 Tag Detection (RD): I.CODE1 Mode Only

This command assigns temporary Tag numbers to each of multiple Tags that are present in the
communications area. This command is available only when the system is in I.CODE1 mode. In ISO
mode, you must enable UID (SNR) additional setting, execute 5-3-1 Read Command (RD), and get
UID since the system uses UID (SNR) data as a temporary number.
<Command Format>
STX Node No. Command code
1 2
Communications
method
Data type
Tag No. setting
First read page
No. of read pages
<Response Format>
(1) There will be as many responses as the number of Tags that are present in the communications area.
STX Node No.
1 2
(2) Tag detection end response
STX Node No.
1 2
Response code
Read data
Temporary No.
Caution
!
5-12
Communi-
cations
"RD"
method
2 2
Specifies a communications method with a Tag.
LT: Selective Access
* 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
Set the value with accordance with the number of Tags communicating
simultaneously.
Specification range:1 to 7
* For details refer to 5-10 Tag No. setting.
Specifies the first page in hexadecimal to read from the Tags.
Specification range: FB to 04h (when Block 4 for a Philips product is used
as the user memory,, refer to 2-4 of Section 2 Memory Map of Tag)
Specifies the number of pages from which data is read in hexadecimal.
Specification range: 01 to 10h
Retry Response
Command code
code
flag
"RD"
"00"
1 2 2
Retry Response
Command code
flag code
"RD"
"72"
1 2 2
01: Normal completion
72: The completion of Tag detection
For other response codes, refer to 5-2-4 Response code List.
Indicates the data having been read from a Tag. The number of characters of the
data is as fellows.
ASCII code : No. of read pages x 4
HEX code : No. of read pages x 8
The Temporary Number 00 to 7F are returned under normal conditions.
In the selective access mode of I.CODE1 mode, UID (SNR) additional set-
ting 5-6-5 of Section 5 is disabled. Be sure to set it disable. When you set
it enable, UID (SNR), which is added to the response of the selective ac-
cess read will be short of data.
Note This command works in I.CODE1 mode only. ISO mode is not available.
Data Tag First read
type number page
setting
1 1 2
Temporary Read data
No.
2 As specified
ETX BCC
1 1
Section 5-3
No. of read ETX BCC
page
2 1 1
ETX BCC
1 1