User's Manual

RFID System S21 Configuration Principles
1-4 Introduction
Reader Address When a Reader is part of a network, it must have a unique address. The address is set by the IAD
parameter. Once the Reader has an address assigned, it will only process commands with the
address field matching the Reader’s address. In this way, you can direct commands over the
network to a specific Reader.
Real Time Clock The Reader RD21 has an on board Real Time Clock. Make sure that the date and time are correctly
set. The time can be queried and set using the IUT parameter. The presence of the seconds field in
the time stamp is optional and is controlled by the DTS parameter.
Receiving UHF Data The Reader needs to know the data format in which the Transponder is transmitting information to
properly receive and interpret the information. The Reader’s setting can be checked and modified
by the Group R parameters.
A simple method of matching an unknown Transponder with the Reader’s parameters setting is
given below:
1. Use the programming setup described in Chapter 6, Programming and Testing the
Transponder PT21.
2. Query the Transponder. (See the Q command).
3. Check the Transponder’s parameters using the Group T parameters.
4. Set an identical set of parameters for the Reader using the Group R parameters.
Reader Data Handling Data that is captured from the Transponder is usually stored in an internal buffer. It is then sent to
the monitoring equipment either voluntarily (if DAR=Y), or in response to a query command. You
can customize the format and the fields using the Group D parameters. By setting appropriate
values, you can greatly simplify the implementation of the monitoring software.
Reader Serial Port When setting the serial port parameters, remember that communication with the monitoring
equipment can result in a bottleneck in the RFID System. We recommend, therefore, using the
highest baud-rate available. Also, the line turn-around delay (STD parameter) can greatly degrade
the RFID System’s performance. This parameter must be set to 0, unless required otherwise. For
more information on the Group S parameters, refer to the RFID System S21 Reference Guide.
Reader Reset There are two main ways to reset the Reader:
• Hardware reset
• Software reset.
For the hardware reset, switch off the Reader’s power supply for a least 5 seconds.