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WIT2410

©

2000- 2005 Murata



Inc

4

M-2410-0000 Rev G

As an additional benefit, RF spectrum has been set aside at 2.4 GHz in most
countries (including the U.S.) for the purpose of allowing compliant spread spectrum
systems to operate freely without the requirement of a site license. This regulatory
convenience alone has been a large motivation for the industry-wide move toward
spread spectrum.

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Содержание WIT2410NF

Страница 1: ...WIT2410NF 2 4GHz Spread Spectrum Wireless Industrial Transceiver Integration Guide 3079 Premiere Pkwy Ste 140 Duluth Georgia 30097 www Murata com 1 678 684 2000 ...

Страница 2: ... Corner Reflector The field strength radiated by any one of these antennas when connected to Murata RF products may exceed FCC mandated RF exposure limits FCC rules require professional installation of these antennas in such a way that the general public will not be closer than 20 cm from the radiating aperture of any of these antennas End users of these systems must also be informed that RF expos...

Страница 3: ...on States Norway Switzerland Use of the WIT2410 in France When used in France the WIT2410 can only be operated with the France hopping pattern selected This is accomplished by setting the pe parameter to 1 Refer to European Union Settings in this manual for details Canadian Department of Communications Industry Canada IC Notice Canadian Department of Communications Industry Canada IC Notice This a...

Страница 4: ...Duty Cycling 12 2 3 4 RF Flow Control Mode 12 2 3 5 Co Existing with 802 11b Networks 13 2 3 6 European Union Settings 13 3 PROTOCOL MODES 14 Note on Using Protocol Mode 4 16 3 1 1 Data Packet 17 3 1 3 Connect Packet 18 3 1 4 Disconnect Packet base only receive only 18 4 MODEM INTERFACE 19 4 1 Interfacing to 5 Volt Systems 20 4 2 Evaluation Unit and OEM Module Differences 20 4 3 Three Wire Operati...

Страница 5: ...cifications 47 9 1 1 Ordering Information 47 9 1 2 Power Specifications 47 9 1 3 RF Specifications 47 9 1 4 Mechanical Specifications 47 9 2 Serial Connector Pinouts 48 9 3 Approved Antennas 48 9 4 Technical Support 49 9 5 Reference Design 50 9 6 1 Mechanical Drawing WIT2410M4 Pins Down 51 9 6 2 Mechanical Drawing WIT2410S4 Pins Up 52 10 Warranty 53 ...

Страница 6: ...uffer ensures data integrity Digital addressing supports up to 64 networks with 62 remotes per network Low power 3 3v CMOS signals Simple serial interface handles both data and control at up to 230400 bps Fast acquisition typically locks to hopping pattern in 2 seconds or less Selectable 10 mW or 100 mW transmit power Support for diversity antenna Built in data scrambling reduces possibility of ea...

Страница 7: ...ows 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 1 2 Frequency Hopping vs Direct Sequence The two primary approaches to spread spectrum are direct sequence DS and frequency hopping FH either of which can generally be adapted to a given application Direct sequence spread spectrum is p...

Страница 8: ...interleave with less interference Frequency hopping does carry some disadvantage in that as the transmitter cycles through the hopping pattern it is nearly certain to visit a few blocked channels where no data can be sent If these channels are the same from trip to trip they can be memorized and avoided unfortunately this is generally not the case as it may take several seconds to completely cover...

Страница 9: ...en set aside at 2 4 GHz in most countries including the U S for the purpose of allowing compliant spread spectrum systems to operate freely without the requirement of a site license This regulatory convenience alone has been a large motivation for the industry wide move toward spread spectrum ...

Страница 10: ... registration process identifies to the base station the remotes from which transmissions will be received and not discarded Registration also allows tracking of remotes entering and leaving the network The base station builds a table of serial numbers of registered remotes To improve efficiency the 24 bit remote serial number is assigned a 6 bit handle number Two of these are reserved for system ...

Страница 11: ...point and all other radios in the network set up as remotes In this configuration all communications take place between the base station and any one of the remotes Remotes cannot communicate directly with each other It should be noted that point to point mode is a subset of point to multipoint mode and therefore there is no need to specify one mode or the other 2 2 1 Point to Point In point to poi...

Страница 12: ...ized by the user application unless the remote device can distinguish between transmissions intended for it and transmissions intended for other remote devices This is necessary to identify the remote to which the base station should send data When the user packet is received by the remote if the remote is in transparent mode protocol mode 0 the packetization bytes are stripped by the remote In th...

Страница 13: ...one remote using the point to point mode command of the radios will override this handle mechanism and always assign the remote the same handle 2 2 4 TDMA Operation For applications needing guaranteed bandwidth availability the TDMA operation of the WIT2410 can meet this requirement In the WIT2410 TDMA scheme each remote has an assigned time slot during which it can transmit The base station time ...

Страница 14: ...f 32 kbps Counting the 1 7 ms overhead for the base packet and making use of the fact that our RF rate is 460 8 kbps we determine that the base slot requires approximately Each remote time slot will be 10 ms 2 3 ms 9 0 5 ms 10 From our RF data rate of 460 8kbps we see that it takes 17 36 s to send a byte of data so each remote will be able to send up to 18 bytes of data per hop Note that the 18 by...

Страница 15: ...io systems and also many spread spectrum radio systems which use direct sequence spreading this would imply a loss of contact on average of over 30 seconds per hour per station The WIT2410 overcomes this problem by hopping rapidly throughout the band in a pseudo random pattern If a message fails to get through on a particular channel the WIT2410 simply tries again on the next channel Even if two t...

Страница 16: ...e way with a prompt To return to Data Mode enter the Exit Modem Control Mode command z or assert and deassert the Sleep pin There are three modes for the escape sequence controlled by the Set Escape Sequence Mode command zc zc 0 Escape sequence disabled zc 1 Escape sequence available once at startup default setting zc 2 Escape sequence available at any time The zc2 mode setting is useful if the us...

Страница 17: ...on it is possible to overrun the receive buffer of the receiving radio For example a nominal 115 2Kbaud at the transmitting radio s host might really be 115 201 and at the receiving radio s host it might be 115 199 This is similar to a situation where the transmitting radio is sent data at a higher baud rate than the baud rate at which data is received by the receiving host To compensate for the v...

Страница 18: ...s for details 2 3 6 European Union Settings When operating the WIT2410 in France a limited frequency mode must be selected pe values of 5 6 or 7 may be used To select the limited frequency band pe 5 at the configuration mode prompt enter pe5 CR Save this setting by typing m CR The limited frequency operation will take effect immediately and will be saved into memory for use when power is cycled Us...

Страница 19: ...Protocol Mode command Base and remote radios can use protocol modes to insure that a packet is transmitted to the base without being broken up over multiple hops The data length value in the data packet becomes the effective minimum packet length and maximum packet length for that packet Note that if the remote data length is set to a number of bytes that is longer than the number of bytes that ca...

Страница 20: ...are provided packet types supported Data CONNECT DISCONNECT mode 04 This is the packet format used by the WIT2400 This allows legacy software to operate the WIT2410 with a minimum of changes Note however that since different air data rates are used WIT2410s and WIT2400s cannot be mixed in a network packet types supported 2400 data format addresses must be limited to 1 62 modes 05 08 reserved for f...

Страница 21: ...re distinguished by their factory assigned serial number When using protocol Mode 4 in the WIT2410 the static address of the WIT2400 is replaced with the current handle of the WIT2410 In point to multipoint configurations a remote s handle is not guaranteed to remain the same if the remote drops link with the base and then re establishes link In a point to point system the point to point mode of t...

Страница 22: ...number from previous cell Note that while the packet length can be set to 212 the maximum number of bytes transmitted per hop is limited to the lesser of 212 or the length specified by maximum data length Packets with a data length longer than that will be discarded and not sent See Get Maximum Data Length for more details 3 1 1 Data Packet Modes 01 02 Base 1110 1001 00HH HHHH LLLL LLLL 0 208 byte...

Страница 23: ...e number T transmit sequence number N network number of base Remotes must go through an automatic registration process when roaming from one base to another after loss of contact or when acquiring a base signal for the first time after power up The base then assigns the remote a handle value may or may not assign it a dedicated time slice depending on the user settings and notifies the user applic...

Страница 24: ...Input Request to send Gates the flow of receive data from the radio to the user on or off In normal operation this signal should be asserted When negated the WIT2410 buffers receive data until RTS is asserted 0v 1 Receive data RxD enabled 3 3v 0 Receive data RxD disabled 6 SLEEP Input Sleeps wakes radio transceiver In sleep mode all radio functions are disabled consuming less than 50µA At wake up ...

Страница 25: ...eader If you have the OEM module interfaced to an RS 232 transceiver RTS and DTR need to be pulled high on the transceiver side In the evaluation unit RTS and DTR are pulled high on the transceiver side so the evaluation unit will work with these signals not connected 4 3 Three Wire Operation The WIT2410 can be operated in a three wire configuration using just TxD RxD and Ground To operate the WIT...

Страница 26: ...gram memory When the radio is first powered on there is an inrush current in excess of 250mA The power supply in the host must be capable of sourcing this current without the voltage falling below 2 7 volts at the radio Failure of the power supply to meet this requirement can result in motorboating of the radio where the inrush current of the radio pulls the supply voltage below 2 7 volts causing ...

Страница 27: ... wna Most commands which set a parameter also have a option which causes the modem to respond with the current parameter setting e g wn Each modem command must be followed by either a carriage return or a line feed 5 1 Serial Commands These commands affect the serial interface between the modem and the host The default settings are 9600 bps and protocol mode 0 Command Description sd 00 FF Set Data...

Страница 28: ...ormula DIVISOR 230400 RATE 1 Round all non integer values down Set Protocol Mode Enables the base station to operate in a multipoint network Depending on the user application more or less acknowledgment may be desired by the application Remotes can operate in transparent mode even though the base station is operating in one of the nontransparent modes When using a protocol mode make sure to count ...

Страница 29: ...de 0 Multipoint mode default 1 Point to point direct mode ww 0 1 Base DCD Enable 0 DCD always asserted default 1 Base asserts DVD when pn 1 remote registered dx 0 ff remote only Set Range optimization 0 default Set Transceiver Mode Sets modem operation as either base station or remote Default is remote Set Default Handle Sets handle number between 1 and 62 inclusive for a remote This handle will o...

Страница 30: ...I This command reports the relative signal strength averaged over the last 10 hops This command returns a one byte value that is proportional to received signal strength and can range from 00H to FFH Typical values range from 30H to 80H where the lower the number the lower the received signal strength and the higher the number the higher the received signal strength This is a relative indication a...

Страница 31: ...i 0 1mi x dx 0 17km 0 17km x dx max 0 8mi 0 1mi x dx 1 33km 0 17km x dx The following table presents various values of dx and the associated optimal and max ranges dx setting range min optimal max 00H 0mi 0km 0 1mi 0 2km 0 8mi 1 3km 01H 0mi 0km 0 2mi 0 3km 0 9mi 1 5km 04H 0mi 0km 0 5mi 0 8km 1 2 mi 2 0km 06H 0 1mi 0 2km 0 7mi 1 2km 1 4mi 2 3km 09H 0 4mi 0 7km 1 0mi 1 6km 1 8 mi 3 0km 13H 1 4mi 2 3...

Страница 32: ... B 2459 2485MHz avoids 11b channels 1 7 ph 00 fe base only Set Hop Duration 90H default 10ms pk 00 d0 Set Minimum Data Length 01 default pl remote only Get Maximum Data Length read only D4 default 212 bytes pn 01 3e base only Set Maximum Number of Remotes 3e default 62 remotes pr 00 ff Set Packet Attempts Limit 10H default FFH Infinite retry RF flow control point to point only pt 00 ff Set Data Tr...

Страница 33: ... mode The radio will wait until the data transmit delay elapses before sending a data packet with less than this number of bytes Can be used to keep short intermittent transmissions contiguous In packet modes the length parameter in the data packet will override this value See Section 3 1 This value is subject to the maximum data length even in packet mode See Get Maximum Data Length below Get Max...

Страница 34: ...ignment Mode base station only Sets whether the base station will assign remote transmit slots dynamically based on the number of remotes currently registered or whether the base station will assign remote transmit slots statically based on the maximum number of remotes parameter If static slot assignment is selected make sure maximum number of remotes is correctly set Otherwise remote transmit pe...

Страница 35: ...de Enables or disables the ability to use the in data stream escape sequence method of accessing Control Mode by transmitting the string wit2410 When this mode is set to 1 the escape sequence only works immediately after reset this is the default When set to 2 the escape sequence may be used at any time in the data stream when preceded by a pause of 20 ms For backwards compatibility with the WIT24...

Страница 36: ...faults or recalling memory will not take effect until DTR is toggled or power to the radio is cycled Command Description m0 Recall Factory Defaults m Recall Memory m Store Memory m Display Modified Parameters Recall Factory Defaults Resets the WIT2410 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 suspec...

Страница 37: ...a Length pr 00 ff Set Packet Attempts Limit pt 00 ff Set Data Transmit Delay remote only pv 0 1 Set Slot Assignment Mode base only pw 00 34 Set Base Slot Size base only px 0 1 Set ARQ Mode Status Commands zb 0 1 Banner Display Disable zc 0 2 Set Escape Sequence Mode zh Read Factory Serial Number High Byte zm Read Factory Serial Number Middle Byte zl Read Factory Serial Number Low Byte zp 0 4 Set D...

Страница 38: ...vailable as the WIT2410 does not support software flow control When the developer s kit is shipped from the factory one HN 510 is set up as a base station and the other is set up as a remote The interface rate for both modems is set at 9600 bps The default setting for the network key allows the modems to communicate without changing any settings As a quick test separate the two modems by about 5 f...

Страница 39: ... industrial transceivers or WIT radios WinCOM is located on the Manuals and Software CD included in the developer s kit Install WinCOM by navigating to the 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 ...

Страница 40: ...nder Edit Copy Paste Find search and Select All perform the familiar Windows functionality in typical fashion The Options menu contains the selections Show Comm Errors which lists any errors encountered in the PC UART Check Comm Ports on Bootup tells WinCom to verify each available port and lists them as such in the Com Port drop down field See the section entitled WinCom Tools for an explanation ...

Страница 41: ...on banner to be displayed unless the banner is disabled via the Banner Display Disable command zb0 The COM port and baud rate can be changed using the drop down menus on the bottom right All the available COM ports will be listed in the menu but will have OK or N A designated If another program that uses a COM port is open that COM port will not be available for use by WinCOM The boxes on the lowe...

Страница 42: ...ed the radio will respond with Error as shown above Until the command to save the parameters m is issued the new parameters will only be valid until power is cycled or DTR is toggled by pressing the F1 key twice New parameter values that have been issued are saved to non volatile memory using the m command Refer to the Memory Commands section for details on this and other helpful memory commands T...

Страница 43: ...tations of Windows For example a carriage return will not return the cursor to the left side of the window but the character corresponding to 0xd value of the carriage return will be displayed Similarly if the Hex Mode box is checked all characters are displayed in hexadecimal format The Clear Screen button deletes all the text in the display window The Clear CTS and Clear DCD buttons reset the re...

Страница 44: ... F5 Toggles local echo If you are transmitting characters through one modem to another WIT2450 this allows you to see what you are typing F6 Toggles stream mode Causes WinCOM to transmit a repeating pattern of characters Useful for testing F8 Toggles binary mode Displays extended ASCII and control characters Useful for testing PgUp Sets data rate of PC serial port to next higher value Value is dis...

Страница 45: ...cking the Transmit button will send the Transmit String a single time There is no need to click Stop Clicking on the Transmit button a second time will have the string transmitted a second time The third allows for checking of available Comm Ports and is useful for refreshing the list The fourth Transmit Tools allows for testing of the Transparent WIT2410 WIT910 or WIT2411 settings Parameters rela...

Страница 46: ... in the Handle window Type whatever data to be transmitted in the Data to Transmit window In the bottom window you will see the entire packet being built as the data is entered in the windows When all the data has been entered click on the Transmit button to send the data WinCOM has the ability to perform any function or sequence of functions WinCOM can perform through a script file A script file ...

Страница 47: ... rate of the PC COM that WinCOM is using to 115 200 kbps de asserts DTR waits 200 milliseconds asserts DTR waits 200 milliseconds sends the configuration mode escape sequence waits 200 milliseconds and then sends the m command to the radio What this script file does is set the PC COM port baud rate to 115 2 kbps puts the radio in config mode and the issues the command to display all of the radio p...

Страница 48: ...en and the file is transmitted immediately The Capture File dialog displays with a bar showing loading progression Once the file has finished transmitting the Final Average Throughput and Bytes sent numbers will be displayed 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 ...

Страница 49: ...he base station s signal and also assert its DCD signal 4 Access modem control mode for each unit To access modem control mode use the F1 key to toggle DTR to 0 and back to 1 and then press the F3 key which sends the wit2400 escape sequence If you are not using COM24 simply turn the radio off and back on and then type wit2400 must be lower case no backspace characters The transceiver should echo b...

Страница 50: ...n zero link margin Carrier is detected but no data appears to be received Make sure that RTS is asserted to enable receive character flow In a point to point application if a remote is not receiving data check that the base s default handle is the same as the remote s In a multipoint application check that the remote is not configured for protocol mode and that the base is using the correct protoc...

Страница 51: ... characters Check that the transmitted data can get through under these conditions Sometimes this symptom is caused by an application that is explicitly dependent on the timing of the received data stream The nature of the packetized RF channel imposes a degree of unpredictability in the end to end transmission delay Cannot communicate with the OEM module Make sure DTR and RTS are asserted DSR sho...

Страница 52: ... no license required ETSI European Certification brETSI 300 328 no license required Rated RF Power 18 dBm 20 dBm effective radiated Line of site Range approx 6 10 of a mile w 2dB dipole Frequency Range 2401 2495MHz Number of Channels 75 US Canada France Spain Japan 25 Receiver Sensitivity 93dBm Channel Data Rate 460Kbps IF Adjacent Channel Rejection 55dB 9 1 4 Mechanical Specifications Weight 35g ...

Страница 53: ...oper operation 9 3 Approved Antennas The WIT2410M S4 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 The table below lists the antennas which can be purchased directly from Murata Contact Murata Technical Supp...

Страница 54: ...WIT2410 2000 2005 Murata Inc 49 M 2410 0000 Rev G 9 4 Technical Support For technical support call Murata at 678 684 2000 between the hours of 8 30AM and 5 30PM Eastern Time ...

Страница 55: ...23 22 24 C1 C1 C2 C2 R1OUTB T1OUT T2OUT T3OUT T4OUT T5OUT R1OUT R2OUT R3OUT R2IN R3IN R1IN VCC V V FORCEON FORCEOFF INVALID GND T4IN T5IN T2IN T3IN T1IN DTR_SLEEP_3 3V RS232 Interface D1 MBR0520L 1 2 CTS_3 3V C3 1 uF TXD_3 3V RXD C5 0 1uF 1 2 RXD_3 3V R1 10k 1 2 C1 0 22uF 1 2 C4 1 uF WIT2410 Interface R1 6 8k 1 2 R2 6 8k 1 2 RTS VCC 3 3V Optional pullups to keep RTS and DTR asserted when left unco...

Страница 56: ...WIT2410 2000 2005 Murata Inc 51 M 2410 0000 Rev G 9 6 1 Mechanical Drawing WIT2410M4 Pins Down ...

Страница 57: ...WIT2410 2000 2005 Murata Inc 52 M 2410 0000 Rev G 9 6 2 Mechanical Drawing WIT2410S4 Pins Up ...

Страница 58: ...al to the goods such as but not limited to power failure No suit or action shall be brought against Seller more than twelve 12 months after the related cause of action has occurred Buyer has not relied and shall not rely on any oral representation regarding the goods sold hereunder and any oral representation shall not bind Seller and shall not be a part of any warranty THE PROVISIONS OF THE FOREG...

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