Cirronet WIT2410P Integration Manual Download

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5015 B.U. Bowman Drive Buford, GA 30518 USA Voice: 770-831-8048 Fax: 770-831-8598

Certification Exhibit

FCC ID: HSW-2410P

IC: 4492A-2410P

FCC Rule Part: 15.247

IC Radio Standards Specification: RSS-210

ACS Report Number: 08-0020 - 15C

Manufacturer: Cirronet

Model: WIT2410P

Theory of Operation

Summary of Contents for WIT2410P

Page 1: ...SA Voice 770 831 8048 Fax 770 831 8598 Certification Exhibit FCC ID HSW 2410P IC 4492A 2410P FCC Rule Part 15 247 IC Radio Standards Specification RSS 210 ACS Report Number 08 0020 15C Manufacturer Cirronet Model WIT2410P Theory of Operation ...

Page 2: ...WIT2410P 2 4GHz Spread Spectrum Wireless Industrial Transceiver Integration Guide 3079 Premiere Pkwy Ste 140 Duluth Georgia 30097 www cirronet com 1 678 684 2000 ...

Page 3: ...ote This unit 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 when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the...

Page 4: ...nion Settings in this manual for details Canadian Department of Communications Industry Canada IC Notice Canadian Department of Communications Industry Canada IC Notice This apparatus complies with Health Canada s Safety Code 6 IC RSS 102 To prevent radio interference to the licensed service this device is intended to be operated indoors and away from windows to provide maximum shielding Equipment...

Page 5: ...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...

Page 6: ... Specifications 46 9 1 4 Mechanical Specifications 46 9 2 Serial Connector Pinouts 47 9 3 Approved Antennas 47 9 4 Technical Support 48 9 5 Reference Design 49 9 6 1 Mechanical Drawing WIT2410M4 Pins Down 50 9 6 2 Mechanical Drawing WIT2410S4 Pins Up 51 10 Warranty 52 FCC MPE Calculations Appendix I Operating Scenario for WIT2410P 54 Appendix II Calculation of Maximum Transmit Duty Cycle 55 Append...

Page 7: ...B buffer 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...

Page 8: ...llows 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...

Page 9: ...y 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 cov...

Page 10: ... 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 ...

Page 11: ...he 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 syste...

Page 12: ...s 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 p...

Page 13: ...etized 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 ...

Page 14: ...d 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 tim...

Page 15: ...e of 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 µs 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 1...

Page 16: ...radio 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 tw...

Page 17: ...same 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...

Page 18: ...ation 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 th...

Page 19: ...ands 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...

Page 20: ...et 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...

Page 21: ...s 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...

Page 22: ...s are 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 o...

Page 23: ...ce 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 b...

Page 24: ...ence 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 app...

Page 25: ...5 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 u...

Page 26: ...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...

Page 27: ...ogram 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...

Page 28: ...and 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 D...

Page 29: ...ket overhead when calculating network performance Refer to the section on Protocol Modes for details on each format 5 2 Network Commands Network commands are used to set up a WIT2410 network and to set radio addressing and configuration Command Description wb 0 1 Set Transceiver Mode 0 remote default 1 base station wd 1 3f Set Default Handle Used to override automatic handle assignment by the base...

Page 30: ...link to any base regardless of the network number as long as the lockout key agrees By using different lockout keys the bases to which remotes link can be limited or segregated Set Hopping Pattern The WIT2410 has 64 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 transmissio...

Page 31: ... optimal performance at 0 1 miles 162m Each increment of this parameter adds 0 1 miles 162 m to the working range Thus the optimal and max ranges are determined by optimal 0 1mi 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 8...

Page 32: ...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 Transmit Delay 00H default pv 0 1 base onl...

Page 33: ...ata 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 Maximum Data Length remote only read only This parameter indicates the largest number...

Page 34: ...her 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 performance will suffer as transmit time w...

Page 35: ...Mode 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 WIT...

Page 36: ... defaults 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 sus...

Page 37: ...Data 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 Se...

Page 38: ... available 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...

Page 39: ...ess 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 ...

Page 40: ... Under 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 explanatio...

Page 41: ...gn 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 l...

Page 42: ...ered 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...

Page 43: ...imitations 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...

Page 44: ...ode 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 ...

Page 45: ...clicking 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 r...

Page 46: ...ote 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 fi...

Page 47: ...aud 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 radi...

Page 48: ... Open 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 ...

Page 49: ... the 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...

Page 50: ... non 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 pro...

Page 51: ...ew 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 s...

Page 52: ...247 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 3...

Page 53: ...410M S4 is designed to ensure that no antenna other than the one fitted shall be used with the device The integrator 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 Cirronet Contact Cirronet Technical Support with any questions Description Gain...

Page 54: ...WIT2410P 2000 2008 Cirronet Inc 48 M 2410P 0000 Rev G2 9 4 Technical Support For technical support call Cirronet at 678 684 2000 between the hours of 8 30AM and 5 30PM Eastern Time ...

Page 55: ...7 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 un...

Page 56: ...WIT2410P 2000 2005 Cirronet Inc 50 M 2410 0000 Rev F 9 6 1 Mechanical Drawing WIT2410M4 Pins Down ...

Page 57: ...WIT2410P 2000 2005 Cirronet Inc 51 M 2410 0000 Rev F 9 6 2 Mechanical Drawing WIT2410S4 Pins Up ...

Page 58: ...nal 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 FORE...

Page 59: ... messages from one remote to another and provides broadcast messages for all remotes to hear The WIT2410P uses Frequency Hopping technology to mitigate the effects of fading and jamming The dwell time for this system is set to 10 milliseconds In any 10 ms dwell period the following process takes place sequentially in time Start of dwell 1 Base broadcasts messages to all remotes 2 Remote 1 sends it...

Page 60: ... The above calculation is strictly based on the maximum amount of time our transmitter can transmit in any 10 ms time period regardless of the channel the radio happens to be on at the time Appendix III Calculated Average Power The Power Threshold for General Population portable designation without SAR testing is based on Oct 2005 TCB workshop PPT slide 60 FGHz mW for distances 2 5 cm For the 2 4 ...

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