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Murata WIT2411 Integration Manual

2.4ghz spread spectrum wireless industrial transceiver
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Revision History
Revision
Date
10/18/2005
1
2
11/19/2015
©2010-2015 by Murata Electronics N.A., Inc.
WIT2411 Integration Guide11/30/15
Author
Change Description
Rev C
F. Perkins
Rev D, Reformatted to comply with new Murata V.I.
R. Willett
RFM products are now
Murata products.
WIT2411
2.4GHz
Spread Spectrum
Wireless Industrial
Transceiver
Integration
Guide
www.murata.com

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Summary of Contents for Murata WIT2411

  • Page 1 Spread Spectrum Wireless Industrial Transceiver Integration Guide Revision History Revision Date Author Change Description 10/18/2005 Rev C F. Perkins Rev D, Reformatted to comply with new Murata V.I. 11/19/2015 R. Willett ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide11/30/15 www.murata.com...
  • Page 2 FCC s MPE Requirements Information to user/installer regarding FCC s Maximum Permissible Exposure (MPE) limits. Notice to users/installers using the 24 dBi parabolic dish antenna in conjunction with all Murata products. FCC rules limit the use of this antenna, when connected to Murata products for point-to-point applications only.
  • Page 3 5RQ Basingstoke, United Kingdom – the Notified Body having performed part or all of the conformity assessment on the product. The WIT2411 to which this declaration relates is in conformity with the essential requirements of the R&TTE directive 1999/5/EC and complies with the following standards and/or other normative documents:...

  • Page 4: Table Of Contents

    5.2. Network Commands ......................20 5.3. Protocol Commands......................21 5.4. Status Commands ......................23 5.5. Memory Commands ......................24 5.6. Modem Command Summary.....................25 6. WIT2411 DEVELOPER’S KIT ....................26 7. WinCOM...........................28 7.1. Starting the program ......................30 7.2. Function Keys ........................33 7.3. WinCom Tools........................34 7.4. Script Commands.......................36 7.5.
  • Page 5 9.1.3. RF Specifications .....................41 9.1.4. Mechanical Specifications ..................41 9.2. Serial Connector Pinout .....................42 9.3. Approved Antennas ......................42 9.4. Technical Support ......................43 9.5. Reference Design.......................44 9.6. Mechanical Drawing – WIT2411D ...................45 10. Warranty ..........................46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide11/30/15 www.murata.com...

  • Page 6: Introduction

    WIT2411 1. INTRODUCTION The WIT2411 radio transceiver provides reliable wireless connectivity for either point-to-point or multipoint applications. Frequency hopping spread spectrum technology ensures maximum resistance to noise and multipath fading and robustness in the presence of interfering signals, while operation in the 2.4GHz ISM band allows license-free use and worldwide compliance.

  • Page 7: Frequency Hopping Vs. Direct Sequence

    Transmitting the data signal as usual, but varying the carrier frequency rapidly according to a pseudo-random pattern over a broad range of channels produces a frequency hopping spectrum system. 2 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...
  • Page 8 Of course, other implementation factors such as size, cost, power consumption and ease of implementation must also be considered before a final radio design choice can be made. 3 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...
  • Page 9 This regulatory convenience alone has been a large motivation for the industry-wide move toward spread spectrum. 4 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 10: Radio Operation

    If there is no data to be sent, the base station will not transmit data until the next frequency. 5 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 11: Data Transmission

    Commands for complete details on parameters affecting the transmission of data. 2.2. Data Transmission The WIT2411 supports two network configurations: point-to-point and point-to- multipoint. In a point-to-point network, one radio is set up as the base station and the other radio is set up as a remote. In a point-to-multipoint network, a star topology is used with the radio set up as a base station acting as the central communications point and all other radios in the network set up as remotes.

  • Page 12: Point-To-Multipoint

    WIT2411 The WIT2411 has a point-to-point direct mode which fixes the remote radio’s handle at 30H. This mode is recommended for point-to-point applications, especially if the remote is likely to periodically leave and re-enter the coverage area of the base. See the section on Network Commands for details of this mode.

  • Page 13: Tdma Operation

    2.2.4. TDMA Operation In the WIT2411 TDMA scheme, the base station time slot is set independently of the remote time slots through the Set Base Slot Size command. The base divides the time remaining in the hop after subtracting for the base overhead, base slot size and guard bands between remote transmit slots into 26 equal-size remote transmit slots.
  • Page 14 In this case, each remote would get 1/26 of the remote to base aggregate throughput of about 250Kbps or about 9600bps. In practice, given the 9 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 15: Full Duplex Communication

    WIT2411 can still communicate reliably. Data input to the WIT2411 is broken up by the radio into packets. A 24-bit checksum is attached to each packet to verify that it was correctly received. If the packet is received...
  • Page 16 Refer to the Protocol Commands section for complete details. 11 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 17: Modes Of Operation

    2.3. Modes of Operation 2.3.1. Control and Data Modes The WIT2411 has two modes of operation: Control mode and Data mode. When in Control Mode, the various radio and modem parameters can be modified. When in Data Mode, only data can be transmitted. The default mode is Data Mode. There are two ways to enter Control Mode.

  • Page 18: Rf Flow Control Mode

    To compensate for the variations in nominal baud rates, the WIT2411 supports an RF flow control mode for point-to-point operation. In this mode, when the receive buffer of the receiving WIT2411 is close to full, the receiving WIT2411 stops acknowledging transmissions. The transmitting radio is set to infinite retries which invokes the RF flow control mode (See Set Packet Attempts Limit in Section 5.3).

  • Page 19: Protocol Modes

    The remotes may still use transparent mode without formatting to send data to the base, if desired. The WIT2411 protocol format is described in detail below. The protocol format is selected through the Set Protocol Mode command.
  • Page 20 Handle 63 (3FH) is reserved for broadcast packets from the base to all remotes. Acknowledgment requests are not supported for broadcasts. For this reason, it is a good 15 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 21: Connect Packet

    When a remote goes out of range or roams to another cell, the base issues a disconnect packet to indicate that the remote is no longer available. 16 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 22: Modem Interface

    WIT2411 4. MODEM INTERFACE Electrical connection to the WIT2411 is made through a 16-pin male header on the modem module. The signals are 3.3 volt signals and form an RS-232 style asynchronous serial interface. The table below provides the connector pinout.

  • Page 23: Interfacing To 5 Volt Systems

    WIT2411 4.1. Interfacing to 5 Volt Systems The modem interface signals on the WIT2411 are 3.3 volt signals. To interface to 5 volt signals, the resistor divider network shown below must be placed between the 5 volt signal outputs and the WIT2411 signal inputs. The output voltage swing of the WIT2411 3.3 volt signals is sufficient to drive 5 volt logic inputs.

  • Page 24: Modem Commands

    WIT2411 5. MODEM COMMANDS The WIT2411 is configured and controlled through a series of commands. These commands are sent to the modem directly when the modem is in Control Mode when the modem is in Data Mode if the escape sequence is enabled. The command syntax is the same for either method, a one- or two-letter command followed by one or more parameters.

  • Page 25: Network Commands

    WIT2411 5.2. Network Commands Network commands are used to set up a WIT2411 network and to set radio addressing and configuration. Command Description wb[?|0|1] Set Transceiver Mode 0 = remote (default) 1 = base station wg[?|0|1] Enable Global Network Mode (remote)

  • Page 26: Protocol Commands

    WIT2411 Set Transmit Power The WIT2411 has two preset transmit power levels, 10mW (10dBm) and 100mW (20dBm). Control of the transmit power is provided through this command. Default is 100mW. Set Point-to-Point Direct Mode Sets point-to-point mode that is recommended for point-to-point applications, especially where the remote radio is mobile and may leave and re-enter the range of the base.
  • Page 27 WIT2411 Set Alternative Frequency Band When set to a value between 1 and 6, will cause the WIT2411 to hop around the various 802.11b channels. When used in this mode, the WIT2411 will not interfere with co- located 802.11b systems. This mode of operation is allowed by the FCC in the United States and the ETS in Europe.

  • Page 28: Status Commands

    WIT2411 5.4. Status Commands These commands deal with general interface aspects of the operation of the WIT2411. Command Description zb[?|0|1] Banner Display Disable 0 = disabled 1 = enabled (default) zc[?|0..2] Set Escape Sequence Mode 0 = disabled 1 = once after reset 2 = unlimited times (default) Read factory serial number high byte.

  • Page 29: Memory Commands

    Display Modified Parameters Recall Factory Defaults Resets the WIT2411 to its factory default state. This is useful for testing purposes or if there is a problem in operation of the system and the configuration is suspect. Use the Store Memory command afterwards if you wish the factory default settings to be remembered the next time you cycle power or reset the radio.

  • Page 30: Modem Command Summary

    For example, given the string wn[?|00..3f], legal commands would be wn?, wn0, wn3, and wn2a. Most commands which set a parameter also have a ? option which displays the current parameter setting; e.g., wn?. 25 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 31: Wit2411 Developer's Kit

    Connection is made to the USB port using the standard USB cable provided. The USB port is provided to simplify communicating to the WIT2411 module in the HN-511 at the 921,600 bps data rate. While most PCs can support that data rate through a USB port, they are unable to do so through a standard RS-232 port.
  • Page 32 In this instance, do not connect the Sleep signal to DTR of the serial port. 27 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 33: Wincom

    Software Tools directory on the Manuals and Software CD and double- click on wincom2.1.exe follow the installation wizard. Once it has installed, open WinCOM by double-clicking on the WinCOM icon on the desktop. 28 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...
  • Page 34 The Help menu displays the About screen which lists the version number, hardware and software information for the system being used. 29 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 35: Starting The Program

    Unless the “Echo” box is checked the typed data will not be displayed in the WinCOM window of the sending radio. 30 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...
  • Page 36 When the radio is linked to another radio, a communications test can be run by clicking on the Transmit button or pressing the F6 key. Whatever ASCII string is in the Transmit String window will be transmitted as shown below. 31 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...
  • Page 37 The Clear Screen button deletes all the text in the display window. The Clear CTS and Clear DCD buttons reset the respective changes counters to zero. 32 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 38: Function Keys

    WinCOM can communicate at new data rate without having to exit and re-enter WinCOM. Sets data rate of PC serial port to next lower value. Value is displayed in PgDn status line. 33 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 39: Wincom Tools

    The fourth, Transmit Tools allows for testing of the Transparent, WIT2410/WIT910 or WIT2411 settings. Parameters related to how the transmission will take place can be set including Handle, Transmit Period, whether or not a Sequence Number should be added, if the Transmission will be continuous or one time, if the data should be sent in Hex Format and whether or not data can be received.
  • Page 40 Each command is separated by a carriage return and linefeed. Configuration commands need to have wait periods between them. The list of commands and their definitions is below: 35 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 41: Script Commands

    Cycling power or toggling DTR will return the radio to data mode. WinCOM prompts you to select the desired .wcr file. Opening the script file causes it to executed immediately. 36 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...
  • Page 42 Finally, the eighth tool is Save to File which launches a Save As dialog that allows any data received to be loaded into a file. 37 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 43: Demonstration Procedure

    6. For a range test, disconnect the remote station from the computer and power supply. The DCD indicator should remain lit as long as the base station is in range.. 7. Exit COM24 by pressing the ESC key. 38 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 44: Troubleshooting

    Can’t enter modem control mode. Make sure the host data rate is correct. The WIT2411 defaults to 9600 bps asynchronous. Evaluation units do not have external access to the CFG_SEL signal; you must use the :WIT2411 power-on escape sequence to access modem control mode.
  • Page 45 OEM Module is in an unknown state. Use the command to restore the factory defaults. Note that the serial baud rate must be known for the module to receive this command. 40 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 46: Appendices

    Huber/Suhner: 85 MMCX 50-0-1 Mating Huber/Suhner: 11 MMCX-50-2-3 (straight) Huber/Suhner: 16 MMCX-50-2-2 (rt. angle) Data/Power Connector: Samtec: DIS5-108-51-L-D Mating Samtec: CLP-108-02-G-D (PCB mount) Samtec: FFSD-08 (IDC cable) 41 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 47: Serial Connector Pinout

    RXD and connect ground. The HN-511 can operate with just these three wires connected. However, as the WIT2411 does not support software flow control, there will be no flow control in this mode. If the DTE device fails to respond, connect DCD from the HN-511 to the DTR and RTS inputs to activate the DTE device whenever the WIT2411 asserts carrier.

  • Page 48: Technical Support

    WIT2411 9.4. Technical Support For technical support call Cirronet™ at (678) 684-2000 between the hours of 8:30AM and 5:30PM Eastern Time. 43 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 49: Reference Design

    T1OUT T1IN R1OUTB V CC 3.3V FORCEON If using a 5.0V converter use the following circuit for TXD,DTR,RTS FORCEOFF INVA LID MA X3 238 TXD_5V TXD_3.3V 44 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 50: Mechanical Drawing - Wit2411D

    WIT2411 9.6. Mechanical Drawing – WIT2411D 45 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...

  • Page 51: Warranty

    SUPPLYING OF THE GOODS. THE FOREGOING WARRANTY EXTENDS TO BUYER ONLY AND SHALL NOT BE APPLICABLE TO ANY OTHER PERSON OR ENTITY INCLUDING, WITHOUT LIMITATION, CUSTOMERS OF BUYERS. 46 of 46 ©2010-2015 by Murata Electronics N.A., Inc. WIT2411 Integration Guide 11/30/15 www.murata.com...
  • Page 52 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Murata WIT2411F...

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