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1 Summary 1.1 WirelessHART Network Overview WirelessHART standard is developed together by HCF member companies, main wireless device manufacturers and industrial users under the guidance of the HART Communication Foundation (HCF). WirelessHART is a wireless mesh network communications protocol, specially designed for process automation application. WirelessHART adopts mesh topology network technology, safe and stable with 2.4 GHz ISM frequency band, and all the information is packaged in one packet, to realize data transmit through DSSS (Direct Sequence Spread Spectrum) based on IEEE802.15.4. A WirelessHART network consists of three key elements: WirelessHART field devices, WirelessHART gateway and WirelessHART network manager, also supports WirelessHART adapter, to let existing HART devices access WirelessHART network, and supports WirelessHART handheld devices, to connect adjacent WirelessHART devices. Figure 1.1 shows the complete WirelessHART network structure. Figure 1.1 WirelessHART Network Structure 1.2 Summary of WH-M WirelessHART Module WH-M WirelessHART module is a wireless communication module compliant with HART7.4 protocol, and is the core part of WirelessHART field device, as shown in Figure 1.2. WH-M periphery provides TTL serial port and control interface. Through the serial port, the WH-M communicates with special customized instrument board, to combine a complete WirelessHART field device. The control interface is used to control input and output of the serial port. WH-M supports all the mandatory commands of fieldbus device in HART7.4 protocol and Burst mode.
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Figure 1.2 WH-M Module Photo 1.3 Reference Specifications Wireless Command Specification HCF_SPEC-155 v2.0 HART Field Communication Protocol Specification HCF_SPEC-13 v7.4 Command Summary Specification HCF_SPEC-99 v9.0 Command Tables SpecificationHCF_SPEC-183 v23.0 2 WH-M Module Composition and Overall Framework Serial port communication mode is used between WH-M module and instrument board, with half-duplex communication mechanism, to complete information interaction between the instrument board and WH-M module. Instrument board provides maintenance port to realize parameter configuration of WH-M module, process monitoring, and other functions. Typical application scenarios of WH-M module are shown in Figure 2.1 below. Figure 2.1 WH-M Typical Application Framework
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3 Mechanical and Electrical Specifications 3.1 Mechanical Specifications Figure 3.1 Mechanical Dimensions of the WH-M Module
3.2 Pin Assignment
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3.3 Electrical Specifications Modulationtype DSSS
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3.4 Antenna Specifications
Antennasupplier
Frequencyrange
Inputelectrical impedance
Standingwaveratio
Length
Gain
Antennamodelnumber
Color
SHENZHEN B&T TECHNOLOGY Co,. Ltd 2400~2483.5MHz
50ohm
<2.0
603mm
1dBi
C3
black
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Thisdevicecomplieswithpart15oftheFCCRules.Operationissubjecttothe
followingtwoconditions:(1)Thisdevicemaynotcauseharmfulinterference,and(2)
thisdevicemustacceptanyinterferencereceived,includinginterferencethatmay
causeundesiredoperation.
Changesormodificationsnotexpresslyapprovedbythepartyresponsiblefor
compliancecouldvoidtheuser'sauthoritytooperatetheequipment.
FCCRadiationExposureStatement
Themodularcanbeinstalledorintegratedinmobileorfixdevicesonly.Thismodular
cannotbeinstalledinanyportabledevice,forexample,USBdongleliketransmitters
isforbidden.
ThismodularcomplieswithFCCRFradiationexposurelimitssetforthforan
uncontrolledenvironment.Thistransmittermustnotbecolocatedoroperatingin
conjunctionwithanyotherantennaortransmitter.Thismodularmustbeinstalled
andoperatedwithaminimumdistanceof20cmbetweentheradiatoranduserbody.
IftheFCCidentificationnumberisnotvisiblewhenthemoduleisinstalledinside
anotherdevice,thentheoutsideofthedeviceintowhichthemoduleisinstalledmust
alsodisplayalabelreferringtotheenclosedmodule.Thisexteriorlabelcanuse
wordingsuchasthefollowing:ContainsTransmitterModuleFCCID:2ADYAM1100
OrContainsFCCID:2ADYAM1100
Whenthemoduleisinstalledinsideanotherdevice,theusermanualofthisdevice
mustcontainbelowwarningstatements;
1.ThisdevicecomplieswithPart15oftheFCCRules.Operationissubjecttothe
followingtwoconditions:
(1)Thisdevicemaynotcauseharmfulinterference.
(2)Thisdevicemustacceptanyinterferencereceived,includinginterferencethatmay
causeundesiredoperation.
2.Changesormodificationsnotexpresslyapprovedbythepartyresponsiblefor
compliancecouldvoidtheuser'sauthoritytooperatetheequipment.
Thedevicesmustbeinstalledandusedinstrictaccordancewiththemanufacturer's
instructionsasdescribedintheuserdocumentationthatcomeswiththeproduct
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