Fifo Access Commands And Responses - Omron V720 Series Operation Manual

Communications Commands and Responses

5-3-2 FIFO Access Commands and Responses

1) Read (RD)
Command for the use of reading data of an ID Tag entering the Antenna area in entering order.
Command Frame Structure
STX Node No.
1 2
Communications
Data type
First read page
No. of read pages
Response Frame Structure
STX Node No.
1 2
Response code
Read data
Command Commu-
code nications
"RD"
2 2
Specifies a communications method.
FT: FIFO Trigger
FA: FIFO Auto
FR: FIFO Repeat
For details, refer to 5-5 Communications Methods.
Specifies whether the read data is represented in ASCII or HEX.
A: ASCII code
H: HEX 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
Retry Command Response
flag
code code
"RD" "00"
1 2 2
00: Normal completion
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 follows:
ASCII code: No. of read pages x 4
HEX code: No. of read pages x 8
Data Fixed First read
type page
"0"
1 1 2
Read data
Specified
number
No. of read ETX BCC
pages
2 1 1
ETX BCC
1 1
Section 5-3
5-7