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RFID System
User's Manual
Section 4 Data Carrier
Section 4
Functions
Data Carrier Service Life Detection
The methods used to detect the service life of the Data Carrier depend on the memory type (SRAM or EEPROM).
For SRAM, a battery life check is performed, and for EEPROM, the number of overwrites is monitored.
•SRAM Data Carriers (with Built-in Battery)
Checking If the Battery is Low
Built-in Battery (Not Including V600-D2KR16)
(1)A battery-low check for the Data Carrier can only be performed when special access is made. The
battery-low check is performed by running a fixed current through the internal circuit of the Data
Carrier. If the battery-low check is performed every time access is made, battery power is also
consumed. It is recommended that this be included as a routine check, once a day, when creating
system programs.
(2)The access method for performing a battery-low check can only be performed when the two bytes of
data from addresses 0000H to 0001H are read. Execute one of the following commands to perform a
battery-low check.
:
Battery-low Check Commands
(3)Response for Low Battery
When the battery is low, 7B is given in the end code section within the response format.
Example
•A battery low check is performed for V600-D2KR16 Data Carriers with replaceable batteries when the
READ/WRITE commands are executed, regardless of the addresses.
a. READ command RD H/A1 0000 02*CR
b. AUTO READ command AR H/A1 0000 02*CR
c. BUTTON READ command BR H/A1 0000 02*CR
d. BUTTON AUTO READ command UR H/A1 0000 02*CR
e. COPY READ command RC H/A1 0000 0002*CR
f. EXPANSION DIVIDED READ command XR H/A1 0000 0002*CR
g. EXPANSION DIVIDED AUTO READ command NR H/A1 0000 0002*CR
h. EXPANSION BATCH READ command rd H/A1 0000 0002*CR
i. EXPANSION BATCH AUTO READ command ar H/A1 0000 0002*CR
j. EXPANSION BATCH BUTTON READ command br H/A1 0000 0002*CR
k. EXPANSION BATCH BUTTON AUTO READ command ur H/A1 0000 0002*CR
RD 00 0995 *CR
AR 00 0995 *CR
Normal
end code
Read data
Manufactured
September 1995
RD 7B 0992 *CR
AR 7B 0992 *CR
Battery low
error code
Read data
Manufactured
September 1992
Normal Battery Low
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