User Manual

Chapter 8 System Parameters and Comm ands
Hi-G-Tek Ltd. Micro electronics & Asset Tracking Technology - 133 -
receiving and performing the command and responding if necessary, it
returns to the state of sleeping and opening the receiver every Tw .
 The duration of the Reader Interrogation Header should be 135msec
more than Tw . T he DataReader has a configurable parameter called
Th w that determines this period. Note that the DataSeal's Tw
parameter should be configured with the same value for all the
DataSeals, and the corresponding Th w parameter value should be
configured appropriately in all the DataReaders in a given system.
Figure 8-0 demonstrates the concept of the wakeup period and the Reader
Interrogation Header. T he upper line represents the time line of the
DataSeal, and the bottom line represents the time line of the DataReader. It
is clear to see from that figure why Th w (the length of the Reader
Interrogation Header) should be just a bit more than the Wakeup Period
(Tw ).
DataSeal
DataReader
- Receive
- Transmit
Wakeup
period
(T w)
Reader
Interrogation
header (Thw =
Tw +135ms
)
Command
Response
Figure 8-0