User's Manual

PT40A Postal Tag RFID-LSCAN
Page: 3 of 6
1 INTRODUCTION
1.1 Purpose
The purpose of this document is to describe the functionality and operation of the PT40A tag intended for use in a RFID system
custom designed for International Post Corporation. The tag features reflect the application requirements. You can find more
details into “PT40A Functional Specifications”.
1.2 Definitions
Valid LF Field – A 125 kHz carrier signal modulated OOK with a signal carrying the exciting device identification number
(ExID).
Excitation Mode – tag transmits its ID together with the exciter ID when it is woken up by a valid LF field.
Transmission – When is excited by a valid LF field, the tag transmits its ID over a 433.92 MHz FSK modulated carrier.
2 BLOCK DIAGRAM
Block diagram for Postag PT40A is presented in Figure 2-1 below:
3 PT40A OPERATION DESCRIPTION
Postag PT40A is a transponder (RF Tag) that receives an excitation signal and responds by transmitting back a message. It is
custom designed for low cost and reliability in the postal environment. It is a direct replacement of previous models PT21 and
PT23 tags and can be used with any of the Lyngsoe RFID systems – S96, S21 S23, and S30. PT40A operates exactly the same
as PT30 only in a smaller form factor that can be placed in a foam carrier.
Postag PT40A provides the following main functions:
- Identifies a valid excitation field and reads the excitation identifier (ExId);
- Following a valid excitation, it transmits on 433.92MHz several identical messages that include (among others) the tag user
data, the ExId and a battery flag.
- Its user data and operating parameters are programmed wirelessly using a special programming device
LF_RX
uCtrl
UHF_TX
3V
Battery
UHF Antenna
LF
Ant
13.56MHz
crystal
Figure 2-1