Selective Access Commands And Responses - Omron V720 Series Operation Manual

Communications Commands and Responses

5-3-4 Selective Access Commands and Responses

1) Detection of Tags
Command for the use of detecting Tags in communications area.
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
· Read data response
STX Node No.
1 2
· Communications end response
STX Node No.
1 2
Response code
Read data
Temporary No.
Commu-
code nications
"RD"
2 2
Specifies a communications method.
LT: Selective Access
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
Specifies the Tag Number setting.
Setting range: 1 to 7
For details, refer to 5-7 Tag Number Setting.
Command
Retry Response
flag
code
code
"RD"
"00"
1 2 2
Retry Command
Response
flag
code
code
"RD"
"72"
1 2 2
00: Normal completion
72:Detection 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
As a normal response, the values 00 to 7F are returned.
Data Tag First read
type No. page
setting
1 1 2
Temporary Read data
No.
2 Specified
ETX BCC
1 1
No. of read ETX BCC
pages
2 1 1
ETX BCC
1 1
number
Section 5-3
5-11