Omron V720 Series Operation Manual page 77

Communications Commands and Responses
2) Lock (LK)
The LK Command is used to set and check the write-protection of Tags. It can be applied to Tag
memory in page units. To read lock information set in a Tag, set all lock information in the com-
mand to 0.
Command Frame Structure
STX Node No. Command
1 2
Lock setting
Lock setting check
The lock information for each page is represented by 1 bit.
b7 b6
page page page
10 9 8
AI: Application ID
A format error will occur (error code 14) if a 1 is set for a bit marked "Fixed `0'."
Response Frame Structure
STX Node No. Retry
1 2
Response code
Note Once a page has been locked, it cannot be unlocked. Be careful when using locks.
code information
"LK"
2
Set to 1 the bit corresponding to the page you want to lock.
Set all lock settings to 0 to read the lock information set in a Tag.
b5 b4 b3 b2
page page page
7 6 5
FC: Family code
Command Response
flag code
"LK"
1 2
00: Normal end
Refer to 5-10 Response Code List for other response codes.
Lock ETX BCC
4 1 1
Lock information
b1 b0 b7 b6
page page page page
4 3 2 1
Lock information
code
"00"
2 4
b5 b4 b3 b2
page AI Fixe Fixe
0 ,FC d'0' d'0'
ETX BCC
1 1
Section 5-3
b1 b0
Fixe Fixe
d'0' d'0'
5-19