Data Carrier Usage Level Check Function - Omron V600 Operation Manual

Data Carrier Memory Map
4-2-4

Data Carrier Usage Level Check Function

4-2-4-1 SRAM DC with Battery
Battery Check
Built-in Battery DCs
(Except V600-D2KR16)
1,2,3...
Note
V600-D2KR16
Replaceable-battery DCs
The Data Carrier's usage level check function varies with the Data Carrier's
memory (SRAM or EEPROM). With the SRAM DC, usage level is obtained
from the battery check function. With the EEPROM DC, the usage level is
obtained from the number of rewrite operations.
Data Carrier battery checks are not performed automatically. A battery check
is performed only for access to specific areas of the DC memory. When a bat-
tery check is performed, a small current is passed through the DC's internal
circuits. Too much power would be consumed if a battery check was per-
formed automatically every time DC memory was accessed.
Include a routine battery check once per day when creating system programs.
The battery check is executed using one of the following commands to read
the contents of two bytes of data from addresses 0000 to 0001 only. (The s at
the end of each command indicates a carriage return.)
1. Read command: @■■ RD H/A 1/2 0000 02 @@ *s
2. Auto Read command: @■■ AR H/A 1/2 0000 02 @@ *s
3. Polling Auto Read command: @■■ PR H/A 1/2 0000 02 @@ *s
Black boxes (■■) indicate the model number and clear boxes (@@) indicate
the FCS.
If the end code of the response is 7B, the battery is low. The following are
responses to Read and Auto Read commands sent to a DC with a good bat-
tery:
@00 RD 00 0595 5F*
@00 AR 00 0595 5A*
Normal completion code
The following are responses to Read and Auto Read commands sent to a DC
with a low battery:
@00 RD 7B 0595 2A*
@00 AR 7B 0595 2F*
Low battery completion code
The battery check is performed for all Read and Auto Read commands
regardless of the addresses.
DC Service Life after a Low Battery Signal
• For Built-in Battery DCs, the DC can be used for about 1 month after a
low battery completion code is received under ordinary operating condi-
tions. It is recommended, however, that the DC be replaced as soon as
possible.
• For V600-D2KR16 Replaceable-battery DCs, the DC can be used for
about 2 weeks after a low battery signal is received under ordinary oper-
ating conditions. It is recommended, however, that the battery be replaced
as soon as possible.
FCS
Read data
Production date: Sept., 1990
Read data
Production date: Sept., 1990
Section 4-2
FCS
33