User's Manual

WJM Series User’s Manual V01.00 www.wj.com 1/12/07 Page 7
2 Product Description
The WJ Communications WJM-series readers are UHF readers operating in a
frequency band of roughly between 902 and 928 MHz. These readers are
compatible with UHF ISO18000-6B and 6C (EPCglobal Class 1 Generation 2)
RFID tags. These modules are ideal for handheld and mobile applications due to
their small form factor, low power consumption and light weight.
The WJM features two MMCX jacks for connecting up to two external antennas.
The transmitter output is software controlled from 18dBm up to 30dBm (1 watt) in
1dB increments. The WJM Interface Board is an easy way to communicate with
the WJM. More information can be found in section 2.4 WJM Interface Board.
The WJM has a header mount option that allows the WJM to be direct mounted
rather than connected via cabling.
WJ Communications recommends that when integrating these modules into final
products, the modules be mounted on a heat sink or on the surface of the metal
enclosure housing the integrated product.
2.1 WJM1000
The WJM1000 is designed as a 0.25 watt reader, ideally for portable and another
compact devices. Operation of this product is greater than 20cm from the users
body, with the intent that the antenna is directed away from the user. The RF
connectors are MMCX to keep the small form factor.
2.2 WJM3000
The WJM300 is designed for fixed reader environments. It transmits at 1 watt in
both typical and dense reader environments. Operation of this product is greater
than 20cm from the users body, with the intent that the antenna is directed away
from the user. The RF connectors are MMCX to keep the small form factor.
WJM Multi Interface Board (MIB)
The MIB allows you to control WJ’s WJM series RFID reader cards by using a
standard interface. This platform serves as an evaluation board for the WJM
series readers as well as a quick means to integrate the WJM for development.
The MIB also serves as a convenient platform to facilitate simple firmware
upgrades to the WJM readers.
The MIB uses a standard RS232 serial port for communications. Use of a USB
to serial adapter offers a convenient USB interface.