User's Manual

ABxS Command 8E (8EH): Memory Lock All
DESCRIPTION
This command “locks” tag addresses in four byte blocks. Once bytes are
locked, they can not be unlocked.
DISCUSSION
The memory can be locked only in 4-byte blocks. The command passes a
two byte word with bits assigned to 4-byte blocks that can be locked. Re
-
maining bits can lock the EAS feature and the lock configuration itself.
When multiple tag-in-field is enabled (Anticollision Index is not 0), the
LRP830 will return a response when the timeout period expires. When mul
-
tiple tag-in-field is disabled, the LRP830 will return a response when it locks
bytes or the timeout expires.
Attempting to write to locked bytes will return a write error timeout in the
status byte. If you write to addresses that\ contain both locked and
non-locked bytes, the LRP830 will return a write error in the status byte.
The configuration word formatted as shown below.
Byte
Bit
Description
Lock LSB
0 Tag bytes 0-3
1 Tag bytes 4-7
2 Tag bytes 8-11
3 Tag bytes 12-15
4 Tag bytes 16-19
5 Tag bytes 20-23
6 Tag bytes 24-27
7 Tag bytes 28-31
Lock MSB
8 Tag bytes 32-35
9 Tag bytes 36-39
10 Tag bytes 40-43
11 Tag bytes 44-47
12 Lock Configuration
13 Lock EAS feature
14 Reserved
15 Reserved
Copyright © 2000 Escort Memory Systems
80 LRP830-Series Long-Range Passive Reader/Writer