Murata WIT2450 Integration Manual
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Murata WIT2450 Integration Manual

Spread spectrum wireless industrial transceiver
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WIT2450 2.4GHz
Spread Spectrum
Wireless Industrial
Transceiver
Integration
Page 1 of 57
www.murata.com
©2015 by Murata Electronics N.A., Inc.
WIT2450 Integration Guide (2015/04/27)

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Summary of Contents for Murata WIT2450

  • Page 1 WIT2450 2.4GHz Spread Spectrum Wireless Industrial Transceiver Integration Page 1 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)
  • Page 2 Notice to users/installers using the 24 dBi parabolic dish antenna in conjunction with all Murata RF products. FCC rules limit the use of this antenna, when connected to Murata RF products for point-to-point applications only. It is the responsibility of the installer to ensure that the system is prohibited from being used in point-to-multipoint applications, omni-directional applications, and applications where there are multiple co-located intentional radiators transmitting the same information.
  • Page 3 5RQ Basingstoke, United Kingdom – the Notified Body having performed part or all of the conformity assessment on the product. The WIT2450 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 ......................29 5.3. Protocol Commands......................31 5.4. Status Commands ......................34 5.5. Memory Commands ......................35 5.6. Modem Command Summary.....................37 6. WIT2450 DEVELOPER’S KIT ....................38 7. WinCOM...........................39 7.1. Starting the program ......................41 Page 4 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc.
  • Page 5 9.2. Serial Connector Pinouts ....................53 9.3. Approved Antennas ......................53 9.4. Technical Support ......................54 9.5. Reference Design.......................55 9.6. Mechanical Drawing – WIT2450 ..................56 10. Warranty ..........................57 Conventions: All Hexadecimal Numbers are written in New Courier font, 10 pt Bold as shown here: 30H Page 5 of 57 www.murata.com...

  • Page 6: Introduction

    Murata's high performance, high-reliability RF know-how that has made Murata products the first choice of designers for mission critical applications. With the WIT2450, designers get that same mission critical reliability and robustness but at a price that allows use in a wide variety of cost-sensitive applications.

  • Page 7: Why Spread Spectrum

    This allows the signal to be reconstructed even though part of it may be lost or corrupted in transit. Figure 1 Narrowband vs. spread spectrum in the presence of interference Page 7 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 8: Frequency Hopping Vs. Direct Sequence

    Page 8 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)
  • Page 9 This regulatory convenience alone has been a large motivation for the industry-wide move toward spread spectrum. Page 9 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 10: Radio Operation

    (protocol mode ). The amount of data that the base station can transmit per hop is determined by the base slot Page 10 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 11: Data Transmission

    2.2. Data Transmission The WIT2450 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

    To the user application, acknowledgments and retransmissions all take place behind the scenes without the need for user intervention. The WIT2450 has a point-to-point direct mode ( ) which fixes the remote radio’s handle at .

  • Page 13: Tdma Operation

    For applications needing guaranteed bandwidth availability, the TDMA operation of the WIT2450 can meet this requirement. In the WIT2450 TDMA scheme, each remote has an assigned time slot during which it can transmit. The base station time slot is set independently of the remote time slots through the Set Base Slot Size command.
  • Page 14 = 15.1 bytes of data per hop. 17.36µs However, the WIT2450 sends data in groups of 4 bytes. Thus, each remote will be able to send 12 bytes of data. If the WIT2450 is using a protocol mode, the packet overhead is stripped off (including start and stop bits) before transmission and does not need to be considered when calculating RF capacity.

  • Page 15: Full Duplex Communication

    WIT2450 can still communicate reliably. Data input to the WIT2450 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: Modes Of Operation

    2.3. Modes of Operation 2.3.1. Control and Data Modes The WIT2450 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 17: Low Power Mode And Duty Cycling

    To compensate for the variations in nominal baud rates, the WIT2450 supports an RF flow control mode for point-to-point operation. In this mode, when the receive buffer of the receiving WIT2450 is close to full, the receiving WIT2450 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 18: Co-Existing With 802.11B Networks

    2.3.5. Co-Existing with 802.11b Networks In some cases, if a WIT2450-based network is located in close proximity to an 802.11b network, the WIT2450-based network can interfere with the 802.11b network. To avoid causing this interference, the WIT2450 radio supports a selection of hopping patterns that avoid the various 802.11b direct sequence channels.

  • Page 19: Protocol Modes

    The remotes may still use transparent mode without formatting to send data to the base, if desired. The WIT2450 supports 10 protocol formats that are described in detail below. The protocol format is selected through the Set Protocol Mode command.
  • Page 20 This mode sends data transparently but supports protocol mode 2 during reception. mode This mode sends data transparently but supports protocol mode 4 during reception. Page 20 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 21: Data Packet

    Acknowledgment requests are not supported for broadcasts. For this reason, it is a good idea to send broadcast messages several times to increase the odds of reaching all remotes. Page 21 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 22: 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. Page 22 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 23: Modem Interface

    4. MODEM INTERFACE Electrical connection to the WIT2450 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. Signal...

  • Page 24: Interfacing To 5-Volt Systems

    Ground. To operate the WIT2450 in this configuration, the Sleep and RTS signals must be tied to ground. These signals are pulled up on the WIT2450 module and if left disconnected will put the radio into sleep mode and RTS will be deasserted. In addition, Power Down Mode (Pin #14) must be tied high.

  • Page 25: Power-On Reset Requirements

    4.4. Power-On Reset Requirements The WIT2450 has an internal reset circuit that provides a reset signal to the microprocessor if the supply voltage to the WIT2450 falls below 2.7-volts. Operation of the microprocessor at voltages below this voltage is unspecified and can result in corruption of the program memory.

  • Page 26: Received Signal Strength Indicator

    The RSSI Strobe output indicates when a valid RSSI signal is present and a high signal indicates a valid RSSI. The figures below show the relationship between the RSSI signal and the RSSI Strobe output. Page 26 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 27: Modem Commands

    5. MODEM COMMANDS The WIT2450 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 28 When using a protocol mode, make sure to count in packet overhead when calculating the time it will take to read data from the module. Refer to the Section 3 on Protocol Modes for details on each format. Page 28 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 29: Network Commands

    5.2. Network Commands Network commands are used to set up a WIT2450 network and to set radio addressing and configuration. Command Description wb[?|0|1] Set Transceiver Mode 0 = remote (default) 1 = base station wd[?|00-3f] Set Default Handle Used to override automatic handle assignment by the base station...
  • Page 30 Set Hopping Pattern The WIT2450 has 32 preprogrammed hopping patterns (also referred to as network numbers). By using different hopping patterns, nearby or co-located networks can avoid interfering with each other’s transmissions. Even if both networks tried to use the same frequency, on the next hop they would be at different frequencies.

  • Page 31: Protocol Commands

    0 = ARQ enabled (default) 1 = ARQ disabled (redundant transmission) Note: Incorrect setting of these parameters may result in reduced throughput or loss of data packets. Page 31 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)
  • Page 32 – 2451.5)MHz. When set to 9, avoids (2429.3 – 2479.1)MHz. When set to A, avoids (2401.7 – 2429.3)MHz and (2458.8 – 2479.1)MHz. If the WIT2450 is to be used in close proximity to 802.11b networks, these alternative hopsets can be used to avoid interfering with the 802.11b networks.
  • Page 33 208 bytes. If using a protocol mode, attempting to send a packet with a length longer than this setting will cause the packet to be discarded. Page 33 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 34: Status Commands

    Thus the receiving host will receive just one copy of the transmission. 5.4. Status Commands These commands deal with general interface aspects of the operation of the WIT2450. Command Description zb[?|0|1]...

  • Page 35: Memory Commands

    Display Modified Parameters Recall Factory Defaults Resets the WIT2450 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 36 Note that issuing this command will cause the radio to lose link with the base and will cause all remotes to lose link when issued to the base radio. Page 36 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 37: 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?. Page 37 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 38: Wit2450 Developer's Kit

    The pinout is provided in Section 7.2. The modems can be used with just a three wire connection. Transmit data, receive data and ground are the three required connections. Note that in this configuration, no flow control is available as the WIT2450 does not support software flow control.

  • Page 39: 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. Page 39 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)
  • Page 40 The Help menu displays the About screen which lists the version number, hardware and software information for the system being used. Page 40 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 41: Starting The Program

    Unless the “Echo” box is checked the typed data will not be displayed in the WinCOM window of the sending radio. Page 41 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)
  • Page 42 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. Page 42 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)
  • Page 43 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. Page 43 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 44: Function Keys

    ”. Used to enter control mode. wit2400 Toggles local echo. If you are transmitting characters through one modem to another WIT2450, this allows you to see what you are typing. Toggles stream mode. Causes WinCOM to transmit a repeating pattern of characters. Useful for testing.

  • Page 45: Wincom Tools

    Format and whether or not data can be received. Data is entered into the Data field, then Data Size can be set and clicking Fill loads the data into the Transmit Field. Page 45 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)
  • Page 46 Configuration commands need to have wait periods between them. The list of commands and their definitions is below: Page 46 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 47: 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. Page 47 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)
  • Page 48 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. Page 48 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 49: 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. Page 49 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 50: Troubleshooting

    Can’t enter modem control mode. Make sure the host data rate is correct. The WIT2450 defaults to 9600 bps asynchronous. Evaluation units do not have external access to the CFG_SEL signal; you must use the :wit2410 power-on escape sequence to access modem control mode.
  • Page 51 Use the command to restore the factory defaults. Note that the serial baud rate must be set correctly for the module to receive this command. Page 51 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 52: Appendices

    Huber/Suhner: 82 MMCX S50-0-2 Mating Huber/Suhner: 11 MMCX-50-2-3 (straight) Huber/Suhner: 16 MMCX-50-2-2 (rt. angle) Data/Power Connector: Samtec: SAMTEC CLT-108-02-G-D Mating Samtec: SAMTEC MTMM-108-05-G-D-300 (PCB mount) Page 52 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 53: Serial Connector Pinouts

    SLEEP) are terminated for proper operation. 9.3. Approved Antennas The WIT2450 is designed to ensure that no antenna other than the one fitted shall be used with the device. The end user must permanently affix the antenna by using an adhesive on the coupling such as Loctite, or ensure the antenna has a unique coupling.

  • Page 54: Technical Support

    9.4. Technical Support For technical support call Murata at (678) 684-2004 between the hours of 8:30AM and 5:30PM Eastern Time. Page 54 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 55: Reference Design

    9.5. Reference Design Page 55 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 56: Mechanical Drawing - Wit2450

    9.6. Mechanical Drawing – WIT2450 Page 56 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)

  • Page 57: 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. Page 57 of 57 www.murata.com ©2015 by Murata Electronics N.A., Inc. WIT2450 Integration Guide (2015/04/27)
  • Page 58 Sub-GHz Modules Click to view products by manufacturer: Murata Other Similar products are found below : HMC-C024 nRF24L01P-MODULE-SMA CMD-KEY2-418-CRE V640-A90 SM1231E868 HMC-C582 SM-MN-00-HF-RC HMC-C031 LoRa Node Kit(US) Sierra HL7588 4G KIT(US) WISE-4610-S672NA EC21AUFA-MINIPCIE EC21EUGA-MINIPCIE CS-EASYSWITCH- 25 EC21JFB-MINIPCIE DL-RFM95-915M DL-RFM96-433M Ra-07H-V1.1 Ra-07 Ra-01SH Ra-01S-T Ra-01SH-T CMD-HHCP-418-MD...

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