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SerialPort
Complete
COMPorts,
USBVirtualCOMPorts,
and
PortsforEmbeddedSystems
SecondEdition
JanAxelson
LakeviewResearchLLC
Madison,WI53704
SeralPortComplete
COMPortsUSBVirtualCOMPortsandPortsforEmbeddedSystems
SecondEdition
JanAxelon
Copyright1998,1999,2000,and2007byanctLAxelion
AllrightsreservedNopartofthecontentsofthisbooksexceptthecodeeamplesmaybe
reproducedorrmansmittedinanyformorbyanymeanswithouthewrittenpermissionof
dhepablisherThecodeeamplesmaybestoredandexecutedinacomputersystemand
maybeincorporatedintocomputerprogamsdevclopedbytheeader
Theinformation,computerprogamsschematicdisgramsdocumentation,andother
materialinthisbookareprovidedasiwithoutwarangyofanykndexpreseedor
impliedindludingwithoucliminationanywarrangyconcermingtheaccuragiadequagior
completenesofthematerialortheresulecbaincdfromusingthemateralNeitherthe
pablishernortheauthorshallberesponsibleforanyclimsatuibutbleroerorsomisions
orotherinaccunciesindhemateralinhisbookInnocvencshallthepublisheroraudhor
belablefordirecindirectspecialinddcnalorconscquentialdamagesinconnection
with,orarisingoutoftheconstruction,performanceorotheruseofthematerialscon
ainedherin。
MPLAB,PICDEM,andPICareregisteredtademarksofMicrochipTechnologyIncinthe
ademaksoftheirrespectiveholders
PublishedbyLakeviewResearchLLC5310ChinookLn。MadisonW53704
OndhewebarwwwLwecom
DisuibatedbyIndependentPublishersGroupmwwipgbookcom.
141312I1**********
ISBN9781931448079
PrintISBN9781931448062
Contents
Introduction。xiii
Acknowledgmentsxix
1OptionsandChoices1
WhentouseaSerialPort2
Advantages2
Timits4
SystemComponents4
TheComputers4
ThePhysicalLink6
Programming6
Applications8
ExampleSystems8
ManagingCommunications9
SpecalpurposeModules9
FormatsandProtocols11
SendingSerialData11
AsymchronousandSynchronousCommanications11
WordFormats12
BitRateandBaudRate13
SystemSupportforLowle