Communications Commands and Responses
Section 5-3
5-9
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
code
“RD”
Communi-
cations
Data
type
Tag
No.
setting
First read
page
No. of read
pages
ETX BCC
1
2
2
2
1
1
2
2
1
1
Communications
Specifies a communications method.
MT: Multi-trigger
MR: Multi-repeat
For details, refer to 5-5 Communications Methods.
Data type
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.
First read page
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.)
No. of read pages
Specifies the number of pages to which data is written in HEX.
Setting range: 01h to 0Ch
Tag Number setting
Specifies the Tag Number setting.
Setting range: 1 to 7
For details, refer to 5-7 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.
Retry
flag
Command
code
“RD”
Response
code
“00”
Read data
ETX BCC
1
2
1
2
2
Specified
number
1
1
n
COMMUNICATIONS END RESPONSE (Multi-trigger Only)
When communications have ended with all Tags within the communications area.
STX
Node No.
Retry
flag
Command
code
“RD”
Response
code
“72”
ETX BCC
1
2
1
2
2
1
1
Response code
00: Normal completion
72: COMMUNICATIONS END RESPONSE
For other response codes, refer to 5-10 Response Code List.
Read data
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
