User's Manual

5-4 Communication Commands
5-4
5-34
5-4-6 Read (RD)-Fast Read Access: I.CODE1 Mode only
When there is only a single Tag in the communications area, this command enables to read data from the
Tag faster than a usual Read.
<Command Format>
STX Node No..
Command
code
“RD”
Communi
cations
method
Data
type
Setting
Tag
No.
First
read
page
No. of
read pages
ETX BCC
1 2 2 2 1 1 2 2 1 1
Communications
method
Specifies the communications method with a Tag.
UT: Special Read Trigger
UA: Special Read Auto
UR: Special Read Repeat
* Refer to SECTION 5-3-4 Communication Mode List for details.
Data type Specifies whether the read data is represented in ASCII or HEX.
A : ASCII code
H : HEX code
* Refer to SECTION 5-3-6 Specifying a Data Code for details.
Tag No. setting Set the number of Tags which communicate simultaneously.
* Refer to SECTION 5-2-5 Specifying a Tag Code: I.CODE1 for details.
Specification range: 0 to 7
First read page Specifies the first page in hexadecimal to read from the Tags.
Specification range: FB to 0A (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 10
<Response Format>
STX Node No..
Retry
flag
Command
code
“RD”
Response
code
“00”
Read data ETX
BCC
1 2 1 2 2
As specified
1 1
Response code 00:normal completion
For other Response Codes, refer to SECTION 5-3-7 Response Code List.
Read data 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
：In Fast Read Access, multiple Tags can be read in the same way as in Multiple Repeat mode by
setting the Tag code other than 0 and specifying UR as the communication method. However, data is
repeatedly read while the Tag is in the communication area. (Refer to SECTION 3-2-5).
When UT or UA is specified as the communication method, the anti-collision processing (the operation to
prevent the collision of the response returned by the Tag), it is not performed even if a number other than
0 is specified as the Tag code. Therefore, if a collision (of the response) takes place, its Tag data cannot be
read. It is recommended that the command be used in Multiple Access mode (MT/MR). The command is
available in I.CODE1 Mode only; it is not available in ISO Mode.