Write Protect Function - Omron V600-HAM42-DRT Operation Manual

Data Carriers (EEPROM, Without Battery)

2-3-3 Write Protect Function

Setting the Write Protect Function
Examples
1, 2, 3...
Canceling Write Protection
The write protect function protects important data stored in the memory of the
Data Carrier, such as product number and model, from being overwritten inad-
vertently. With this function, the data in a specified memory area can be pro-
tected. It is recommended that important data be write-protected as follows:
The write protect function is set by writing the final address to be protected in
address 0000 of the Data Carrier's memory. The status of the most significant
H
bit of address 0000
effect.
Address
7
0000 YES/NO
H
The region specified by the end addresses will be protected when the write pro-
tect control bit (most significant bit of address 0000
lowing table.
Most significant bit of 0000
ON
OFF
The following addresses can be set for the end address:
End address: 00
Address 0080 to 00FD
H
address is set to 00
tected.
1. The following settings would write-protect addresses 0001
Address Bit
7 6 5 4 3 2
0000 1 0 0 1 0 0
H
9
2. The entire memory except address 0000
end address to 00
Address Bit
7 6 5 4 3 2
0000 1 0 0 0 0 0
H
8
(End address set to 00
To cancel write protection, turn OFF the most significant bit of address 0000
The write protection will be cancelled, and the address set in 0000
ignored.
Note 1. Address 0000
2. The first address that is write-protected is always 0001
the data so that any data that needs to be write protected is written at
addresses from 0001
determines whether or not the write protect function is in
H
6 5 4
End address
H
Data is write-protected.
Data is not write-protected.
, 01 to 7F
H H H
can therefore not be set as the end address. If the end
H
, however, all addresses from 0001
H
Address
1 0
1 0
2
, as shown below.
H
Address
1 0
0 0
0
.)
H
cannot be write-protected.
H
on.
H
Section
Bit
3 2 1
) is ON, as shown in the fol-
H
Write Protect Function
to 00FD
H H
through 0012
H
Write-protected
addresses
is write-protected by setting the
H
Write-protected
addresses
. Always structure
H
2-3
0
will be pro-
:
H
.
H
will be
H
25