65
RFID System
Operation Manual
Sec
tion 4
Da
ta
Car
rie
r Serv
ic
e Li
fe
Det
ec
ti
o
n
Section 4
Function
Data Carrier Service Life Detection
Data Carriers with Built-in Battery
(V600-D
@
KR
@@
and V600-D
@
KF
@@
)
■
Checking If the Battery Is Low
●
Data Carriers with Built-in Batteries (Excluding V600-D2KR16)
(1)A battery-low check for the Data Carrier can be performed only when special access is made.
The battery-low check is performed by running a fixed current through the internal circuit of the Data Car-
rier. If the battery-low check is performed every time access is made, battery power will be 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 is performed when the two bytes of data from
addresses 0000H to 0001H is read.
Execute one of the following commands to perform a battery-low check.
Battery-low Check Commands
(3) Response for Low Battery
If the battery is low, 7B will be given in the end code section within the response format.
Example
●
A battery low check will be performed for V600-D2KR16 Data Carriers with replaceable batteries when
read/write commands are executed, regardless of the addresses used.
■
Data Carrier Life after Low Battery Signal Occurs
●
After a battery-low signal is sent, the Data Carrier can be used for approximately one month in the nor-
mal operating state. The Data Carrier should be replaced, however, as soon as possible.
The SRAM Data Carriers (except the V600-D2KR16) are equipped with a thionyl chloride lithium battery. A characteristic of the thionyl chloride lith-
ium battery is that the internal resistance of the battery increases when the battery is left unused for several months. If this occurs and a Data Car-
rier battery-low check is performed, a low battery response may be returned regardless of whether battery life still remains. This is a result of the
increased resistance within the battery, and is not due to the battery life expiring. If a Data Carrier has been left for several months after purchase
without being used, use the read operation for approximately 10 minutes to activate the battery before use. (Current will flow in the battery and
resistance in the battery will return to normal as a result of activating the battery. The life of the battery will hardly be affected.)
●
When using V600-D2KR16 Data Carriers with replaceable batteries, the Data Carrier can be used for
approximately two weeks in the normal operating state after the low battery signal is sent. The battery
should be replaced, however, as soon as possible.
a REPEAT command - - - - - - - - - - - - - - - - - RD H/A1 0000 02*CR
b AUTO READ command - - - - - - - - - - - - - - AR H/A1 0000 02*CR
c POLLING AUTO READ command - - - - - - PR H/A1 0000 02*CR
A lithium battery is built into SRAM Data Carriers with built-in batteries and may occasionally
cause serious injury due to combustion, explosion, or burning. Dispose of the Product as
industrial waste and never disassemble it, expose it to pressures that would distort it, heat it
to temperatures above 100
C, or incinerate it.
Normal
end code
Read data:
Manufactured
September 1995
Battery low
error code
Read data:
Manufactured
September 1992
●
Normal
●
Battery Low
WARNIN
G
Summary of Contents for V600 Series
Page 50: ...48 Section 2 Wiring RFID System Operation Manual Section 2 Installation and Wiring MEMO ...
Page 72: ...70 Section 4 Write Command Memory RFID System Operation Manual Section 4 Function ...
Page 138: ...136 Section 5 End Codes RFID System Operation Manual Section 5 Communications MEMO ...