V03.00 | 2019/10
15
5.3 Replacing bus-capable read/write heads
Remove the faulty read/write head.
Connect the new read/write head with the default address 68 (delivered with …/C53).
If multiple read/write heads are being replaced: Replace the read/write heads in the or-
der in which they were connected.
a Addresses are allocated in ascending order to the read/write heads in the order in which
the heads were connected. The lowest address is automatically assigned to the next
read/write head with the default address 68 that is connected.
a If the LED on the read/write head is permanently lit, this indicates that the addressing is
complete.
5.4 Typical times for processing a command (HF bus mode)
The time required to cyclically process the command depends on how long the tag is in the de-
tection range of the read/write head (bypass time). The bypass time is set at 48 ms by default.
The bypass time can be set by the user. If the bypass time is set differently, the difference from
the time taken to process a command must be added or deducted.
The time taken for all read/write heads to be addressed once by the interface is calculated as
follows:
Number of read/write heads × bypass time
This time corresponds to the update rate for the Tag in detection range bit and must also be
taken into account when calculating the total time taken to process a command.
The inventory command must be executed separately for all read/write heads.
Command System cycle time Time required Dependence on factors such as
protocol, system, etc.
Read UID on a read/write
head with rising edge at TP,
tag within the detection
range
4ms 24ms Depending on the system
cycle time, the bypass time
must be added.
Read UID on a read/write
head with rising edge at TP,
tag within the detection
range
20ms 80ms
Read 112bytes from different
read/write heads one after
the other, default bypass time
(48ms)
4ms 180ms per read/write
head
The length of time for which
the individual read/write
heads are accessed varies.
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