WJ Module (WJM) Reader Modules User’s Manual Version 1.0 WJ Communications, Inc. 401 River Oaks Pkwy San Jose, CA 94089 Tel: (800) WJ1-4401 Fax: (408) 577-6621 http://www.wj.com WJM Series User’s Manual V01.00 www.wj.
Disclaimer: This information is subject to change without notice. This information is provided “as is,” and WJ makes no claims of it for purposes intended, merchantability or other. All trademarks, service marks, trade names and logos are used in good faith and remain the property of their rightful owners. For actual design-in, refer to the latest publications of WJ Communications data sheets for the most up-to-date specifications of WJ Communications products.
Conventions: WARNING: A warning is used where care must be taken or a certain procedure must be followed, in order to prevent injury or harm to your health. Caution: A caution indicates information on conditions that must be met or a procedure that must be followed, that if not heeded could cause permanent damage to the equipment or software. Note: A note indicates conditions that must be met or procedures that must be followed to ensure proper functioning of the equipment or software.
Table Of Contents 1 Introduction......................................................................................................6 1.1 Contents of this Document........................................................................6 1.2 Audience...................................................................................................6 2 Product Description .........................................................................................7 2.1 WJM1000.................................
List of Figures Figure 1: MIB1000 (Serial) ....................................................................................8 Figure 2: WJM Mechanical / Dimensions ............................................................16 WJM Series User’s Manual V01.00 www.wj.
1 Introduction 1.1 Contents of this Document This manual describes background information for using the WJ Communications WJM series UHF RFID readers. Other documents available from the WJ website: • • • • Installation of the necessary drivers (WJCIRFID.
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.
Figure 1: MIB (Serial) 3 WJM Antennas There are two types of antennas typically used in RFID, linear and circular polarized. The electric field of a linear polarized antenna is constant as the wave propagates in space. The advantage of the linear polarized antenna is a better power transfer; this usually equates to a longer read range.
regulations. Current FCC regulations (Title 47, Volume 1, part 15, section 15.204) allow for any antenna to be used as long as the gain does not exceed the gain of the original certified antenna. Caution should be exercised in attaching any long, relatively heavy cables to the WJM MMCX adapters, as these adapters are not intended to tolerate large mechanical stresses. Connecting the WJM output port through a short length of small-diameter cabling as strain relief is recommended. Please refer to section 8.
GPIO3 GPIO4 14 15 3 27 4.4 User Interface Demo The WJM Demo Software is freely available to the public: • WJM Demo – runs on PCs with Microsoft Windows 98, ME, 2000 or XP The demo software uses the Microsoft .NET Framework, which must also be installed for the demo installation programs (files with an .msi extension) to run. Please visit the website for the latest version of this software that will support newer operating systems. 4.4.1 Installation Execute the file WJM_Demo_Installer.
4.5.2 WJM Example DLL Project Also available on the WJ website is the source code for a simple example C#.NET windows application showing how to use the DLL. 4.6 Upgrade Utility The WJM can be upgraded to the latest firmware by downloading the latest version from the WJ website at www.wj.com. Follow the links to technical support. The WJM cards can be upgraded via the MIB and choosing the associated COM port. Follow the on-screen directions.
5 Compatibility 5.1 Host The WJM is able to interface by a standard RS-232 port. This enables the WJM to work with any system including handhelds, PDAs, laptops and desktop computers. 5.2 Tags The WJM supports several tag types including ISO18000-6B and ISO18000-6C (EPCglobal 1 Generation 2) tags.
6 Troubleshooting / Technical Support 6.1 General The reader does not connect to the demo software: • Wrong COM port selected - Verify the COM port of the reader in the Device Manager. • Card is not powered - Verify the green LED is lit on the MIB, and blue LED is blinking. • Boot load switch is in Boot (MIB only) - Switch the boot loader switch to the normal 6.
Reader does not write tags • Tag has been locked or has an unknown access password • Tag is too far from the antenna 6.3 Tag Programming Programming of RFID tags is more complicated than simply reading tags: there is a substantial amount of communication between the tag and reader. Writing to the tag requires more power for a longer period of time than reading. It is most often the case that a tag can be read at a longer range than it can be programmed (assuming the same conditions.
7 Technical Specifications: WJM Description Specification Additional Info Frequency of Operation 902-928 MHz (US ISM band) Pseudo-random frequency hopping over 50 channels WJM1000 WJM3000 Maximum Output Power Tag Protocols Regulatory Compliance Host Interface 24 dBm (.25 Watts) 30 dBm (1.0 Watt) ISO 18000-6B EPCglobal Class 1 Gen2 US FCC part 15 Currently being tested Peak DC Current Draw 1.
7.1 Mechanical Configuration: Figure 2: WJM Mechanical / Dimensions WJM Series User’s Manual V01.00 www.wj.
8 Notices 8.1 RF Connectors and Connections Caution: Care must be taken during insertion, removal and usage of the RF Connectors to prevent damage and degradation. Torques of greater than 1.7 in-lbs (0.19 newton-meters) can damage the MMCX connectors. It is best to use less torque to reduce the potential for damage. Use of a flexible RG178/196 cable (or something similar) when interfacing to the reader is recommended. Damage to the connectors may render the card unusable.
Caution: Personnel should not be closer than 23 cm (9 inches) from any WJM antenna for prolonged periods of time. See FCC bulletins 56 and 65 for further information on electromagnetic field exposure. 8.4 Patents Portions of the products described in this manual may be covered by currently pending US and foreign patents. 8.5 Copyright Notice The contents of this document are the property of WJ Communications, Incorporated, except where otherwise noted.
9 Regulatory Compliance 9.1 FCC Statement (pending) This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
9.1.1 RF Radiation Exposure Statement These devices comply with FCC radiation exposure limits set forth for an uncontrolled environment and users must follow specific operating instructions for satisfying RF exposure compliance. Warning: To comply with RF radiation exposure requirements in FCC’s regulations, the WJM1000 and WJM3000 products must be installed so there is a separation distance of at least 20 cm (8 in) between all persons and the antenna.
