Communications Command
Section 5-3
5-12
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
“RD”
Communi-
cations
method
Data
type
Tag
number
setting
First read
page
No. of read
page
ETX BCC
1 2
2
2 1
1 2
2 1
1
Communications
method
Specifies a communications method with a Tag.
LT: Selective Access
* For details, refer to 5-8 Communications Methods.
Data type
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
Tag No. setting
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.
First read page
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)
No. of read pages
Specifies the number of pages from which data is read in hexadecimal.
Specification range: 01 to 10h
<Response Format>
(1) There will be as many responses as the number of Tags that are present in the communications area.
STX Node
No.
Retry
flag
Command code
“RD”
Response
code
“00”
Temporary
No.
Read
data ETX
BCC
1 2 1 2
2
2
As
specified
1
1
(2) Tag detection end response
STX Node
No.
Retry
flag
Command code
“RD”
Response
code
“72”
ETX BCC
1 2 1 2
2 1
1
Response code
01: Normal completion
72: The completion of Tag detection
For other response codes, refer to 5-2-4 Response code List.
Read data
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
Temporary No.
The Temporary Number 00 to 7F are returned under normal conditions.
Caution
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.
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