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Communications Commands and Responses
5-3-3 Multiple Access Commands and Responses
1) Read (RD)
Command for the use of reading plural Tags
Command Frame Structure
STX Node No. Command
1
2
Communications
Data type
First read page
No. of read pages
Tag Number setting
Response Frame Structure
n READ DATA RESPONSE
There are the same number of responses as the number of Tags in the Antenna area.
STX Node No.
1
2
n COMMUNICATIONS END RESPONSE (Multi-trigger Only)
When communications have ended with all Tags within the communications area.
STX Node No.
1
2
Response code
Read data
Communi-
Data
code
cations
"RD"
2
2
Specifies a communications method.
MT: Multi-trigger
MR: Multi-repeat
For details, refer to 5-5 Communications Methods.
Specifies whether the read data is represented in ASCII or HEX.
A: ASCII code
H: H.EX code
For details, refer to 5-6 Data Type.
Specifies the first page of the Tag containing data to be read in HEX.
Setting range: 00h to 0Ah, FFh
(FFh can be specified only when using Philips' block 4 as user memory. For de-
tails, refer to 2-5 Tag Memory Map.)
Specifies the number of pages to which data is written in HEX.
Setting range: 01h to 0Ch
Specifies the Tag Number setting.
Setting range: 1 to 7
For details, refer to 5-7 Tag Number Setting.
Retry
Command
Response
flag
code
code
"RD"
"00"
1
2
2
Retry
Command
Response
flag
code
code
"RD"
"72"
1
2
2
00: Normal completion
72: COMMUNICATIONS END RESPONSE
For other response codes, refer to 5-10 Response Code List.
Indicates the data having been read. The number of characters of the data is as fol-
lows:
ASCII code: No. of read pages x 4
HEX code: No. of read pages x 8
Tag
First read
type
No.
page
setting
1
1
2
Read data
Specified
number
ETX BCC
1
1
No. of read
ETX BCC
pages
2
1
1
ETX BCC
1
1
Section 5-3
5-9
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