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Murata WIT2420 Скачать руководство пользователя страница 1

WIT2420

2.4GHz Spread Spectrum

Wireless Industrial Transceiver

Integration Guide

June 2

nd

2021

Note:

This unit has been tested and found to

comply with the limits for a class A 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
instruction manual, may cause harmful
interference to radio communications.  Operation
of  this equipment in a  residential area  is likely to
cause harmful interference in which case the user
will  be  required  to  correct  the  interference  at  his
own  expense.

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Содержание WIT2420

Страница 1: ...e 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...

Страница 2: ...ld void the user s authority to operate this device WARNING a 20cm separation distance must be maintained between this device and the user This device complies with Industry Canada license exempt RSS...

Страница 3: ...nly 14 4 MODEM INTERFACE 15 4 1 Interfacing to 5 Volt Systems 16 4 2 Evaluation Unit and OEM Module Differences 16 4 3 Three Wire Operation 16 4 4 Power On Reset Requirements 17 5 MODEM COMMANDS 18 5...

Страница 4: ...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 eavesdroppi...

Страница 5: ...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 produced b...

Страница 6: ...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...

Страница 7: ...ion from the base station The registration process identifies to the base station the remotes from which transmissions will be received and not discarded Registration also allows tracking of remotes e...

Страница 8: ...er 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 I...

Страница 9: ...ket formats When a remote sends data to a base station in point to multipoint mode the remote host does not need to perform any packetization of the data Remotes can operate in transparent mode even t...

Страница 10: ...uration of 10 ms is chosen We decide that the base station needs to be able to send up to 32 bytes each hop equivalent to a capacity for the base of 32 kbps Counting the 1 7 ms overhead for the base p...

Страница 11: ...for data transmission In a typical office or factory environment 1 2 of the 2 4GHz frequency band may be unusable at any given time at any given station due to noise interference or multipath fading...

Страница 12: ...is only valid immediately after power up or after deassertion of the Sleep pin on the modem The modem will respond in the same way with a prompt To return to Data Mode enter the Exit Modem Control Mo...

Страница 13: ...s 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 variations in nominal...

Страница 14: ...ocol 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 b...

Страница 15: ...he WIT2400 This allows legacy software to operate the WIT2420 Note however that since different air data rates are used WIT2420s and WIT2400s cannot be mixed in a network packet types supported 2400 d...

Страница 16: ...gth 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...

Страница 17: ...es 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...

Страница 18: ...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 WIT2420 buffers receive data until RTS is asser...

Страница 19: ...er 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 connect...

Страница 20: ...ge within 100ms of power being applied and be completely removed within 100ms of dropping below 3 3 volts the host must apply a Reset signal to the module on pin 10 of the power data connector The ope...

Страница 21: ...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...

Страница 22: ...ode make sure to count in packet 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 u...

Страница 23: ...erns 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...

Страница 24: ...00H default pv 0 1 base only Set Slot Assignment Mode 0 default dynamic slot assignment 1 static slot assignment pw 00 30 base only Set Base Slot Size 08H default 32 bytes px 0 1 Set ARQ mode 0 ARQ en...

Страница 25: ...nd protocol mode packets longer than maximum data length will result in the packet being discarded without being sent See Section 2 3 3 on the tradeoffs between hop duration and data length Set Maximu...

Страница 26: ...however the static assignment mode will result in a static maximum data length parameter Set Base Slot Size base station only Sets the amount of time allocated for transmission on each hop for the ba...

Страница 27: ...isables the ability to use the in data stream escape sequence method of accessing Control Mode by transmitting the string WIT2420 When this mode is set to 1 the escape sequence only works immediately...

Страница 28: ...in nonvolatile memory which is loaded during the initialization period every time the radio is powered up Note that changes to the serial port baud rate from recalling the factory defaults or recallin...

Страница 29: ...s Limit pt 00 ff Set Data Transmit Delay remote only pv 0 1 Set Slot Assignment Mode base only pw 00 40 Set Base Slot Size base only px 0 1 Set ARQ Mode Status Commands zb 0 1 Banner Display Disable z...

Страница 30: ...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 separat...

Страница 31: ...attern 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 32: ...er radio and see them appear at the other side If you are using COM24 you can press the F6 key to transmit a repeating test pattern 6 For a range test disconnect the remote station from the computer a...

Страница 33: ...If possible remove any obstructions in the near field of the antenna 3 radius Transmitting terminal flashes CTS occasionally This indicates that the transmitter is unable to reliably get its data acr...

Страница 34: ...ns FCC Certification Part 15 247 RSS 247 ETSI European Certification ETSI 300 328 V2 2 2 Rated RF Power 18 dBm 20 dBm effective radiated Line of site Range approx 6 10 of a mile Frequency Range 2401 2...

Страница 35: ...sure that all of the inputs TXD CFG RTS and SLEEP are terminated for proper operation 7 3 Approved Antennas The WIT2420M S is designed to ensure that no antenna other than the one fitted shall be used...

Страница 36: ...converter use the following circuit for TXD DTR RTS R1 6 8k 1 2 U5 MAX3238 28 25 1 3 16 5 6 7 10 12 24 23 22 19 17 21 20 18 9 11 8 26 27 4 13 14 15 2 C1 C1 C2 C2 R1OUTB T1OUT T2OUT T3OUT T4OUT T5OUT...

Страница 37: ...Murata Electronics Corporation 34 6 2 2021...

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